专栏首页逆向与安全nProtect APPGuard安卓反外挂分析

nProtect APPGuard安卓反外挂分析

工具与环境:

IDA7.0

JEB2.2.5

Nexus 5

Android 4.4

目录:

一:app简单分析与java层反编译

二: compatible.so反调试与反反调试

三: compatible.so注册jni函数分析

四: stub.so反调试与反反调试

五: stub.so注册jni函数分析

六: Assembly-CSharp.dll解密分析

七: libengine模块分析

八:总结

一:app简单分析与java层反编译

整体图:

1.最近在学习手游保护方面的技术,本文是学习过程中分析某反外挂的一点记录,高手莫要见笑,有不对的地方还请指教,首先简单通过资源目录中文件名做基本了解,

在lib目录中有libmono.so、libunity.so,资源目录中存在(assets\bin\Data\Managed\Assembly-CSharp.dll),应该是unity 3D编写,通过反编译发现该文件己被加密,在资源目录下armeabi文件夹中还存放着libengine.sox与libstub.sox文件,看名字猜测很可能这两个文件就是反外挂其中的一些模块了,在看看lib目录下只有libcompatible.so模块比较可疑。如下图所示:

当我们用调试器附加游戏程进时会有如下提示:

被发现有调试器附加,下节我们将分析它的反调试机制。

2.通过JEB反编译来看看大致流程,反编译后先找到application类,代码如下图:

主要是加载so模块,so名称字符串被加密了,解密出来后so名称"compatible",将compatible.so放到IDA中反编译发现函数名被混淆了,字符串己加密,如下图:

通过以上简单分析,我们主要关注的重点关注的模块主要有lib目录下的libcompatible.so与资源目录中的libengine.sox与libstub.sox,还有就是发现java层的字符串与函数名都被混淆,so模块中的字符串也函数名也被混淆。

3.拷贝资源,解密libstub.sox并加载 。

在Lcom/inca/security/Core/AppGuardEngine初始函数<init>(Landroid/content/Context;Lcom/inca/security/AppGuard/AppGuardEventListener;Z)V中将判断X86或ARM平台并将对应的\assets\appguard中的libengine.sox、libstub.sox、update.dat拷贝到程序安装目录。JEB未能正常反编译出java代码,看smali代码。

 1 :1946
 2 00001946  const/4             v9, 3
 3 00001948  if-ge               v6, v9, :1C16
 4 :194C
 5 0000194C  invoke-static       Binder->getABI()I
 6 00001952  move-result         v6
 7 00001954  move-object/from16  v0, p0
 8 00001958  move-object/from16  v1, p1
 9 0000195C  invoke-virtual      AppGuardEngine->iiIIIiiiIi(Context, I)Z, v0, v1, v6  # 拷贝资源
10 00001962  move-result         v6
11 00001964  if-eqz              v6, :1BE0
12 :1968
13 00001968  new-instance        v6, qb
14 0000196C  invoke-static       JNISoxProxy->getContext()Context
15 00001972  move-result-object  v9
16 00001974  invoke-direct       qb-><init>(Context)V, v6, v9
17 0000197A  const-string        v9, "fChY~_h\u0004yEr"  # libstub.sox
18 0000197E  invoke-virtual      qb->iiIIIiiiIi([B)V, v6, v8
19 00001984  invoke-static       b->iiIIIiiiIi(String)String, v9
20 0000198A  move-result-object  v9
21 0000198C  const-string        v10, "j\u000Fd\u0015r\u0013dHu\t"  # libstub.so
22 00001990  invoke-static       yb->iiIIIiiiIi(String)String, v10
23 00001996  move-result-object  v10
24 00001998  const/4             v11, 0
25 0000199A  invoke-virtual      qb->iiIIIiiiIi(String, String, [B)Z, v6, v9, v10, v11  # 解密libstub.sox((最终传入so层解密private static native byte[] iIiIIIiIiI(byte[] arg0, int arg1)))
26 000019A0  move-result         v6
27 000019A2  if-eqz              v6, :1BE0
28 :19A6
29 000019A6  new-instance        v6, File
30 000019AA  new-instance        v9, StringBuilder
31 000019AE  invoke-direct       StringBuilder-><init>()V, v9
32 000019B4  const/4             v10, 0
33 000019B6  invoke-static       JNISoxProxy->getContext()Context
34 000019BC  move-result-object  v11
35 000019BE  invoke-virtual      Context->getFilesDir()File, v11
36 000019C4  move-result-object  v11
37 000019C6  invoke-virtual      File->getAbsolutePath()String, v11
38 000019CC  move-result-object  v11
39 000019CE  invoke-virtual      StringBuilder->insert(I, String)StringBuilder, v9, v10, v11
40 000019D4  move-result-object  v9
41 000019D6  const-string        v10, "%FcHy^\u007FH$Ye"  # /libstub.so
42 000019DA  invoke-static       b->iiIIIiiiIi(String)String, v10
43 000019E0  move-result-object  v10
44 000019E2  invoke-virtual      StringBuilder->append(String)StringBuilder, v9, v10
45 000019E8  move-result-object  v9
46 000019EA  invoke-virtual      StringBuilder->toString()String, v9
47 000019F0  move-result-object  v9
48 000019F2  invoke-direct       File-><init>(String)V, v6, v9
49 000019F8  invoke-virtual      File->exists()Z, v6
50 :19FE
51 000019FE  move-result         v9
52 00001A00  if-eqz              v9, :1BE0
53 :1A04
54 00001A04  invoke-virtual      File->getAbsolutePath()String, v6
55 00001A0A  move-result-object  v9
56 00001A0C  invoke-static       System->load(String)V, v9  # 加载指定路径的SO
57 00001A12  invoke-direct/range AppGuardEngine->lllIIIlllI(Context)V, p0 .. p1  # 调用Native
58 :1A18
59 00001A18  invoke-virtual      File->delete()Z, v6
60 00001A1E  new-instance        v6, File
61 00001A22  new-instance        v9, StringBuilder
62 00001A26  invoke-direct       StringBuilder-><init>()V, v9
63 00001A2C  const/4             v10, 0
64 00001A2E  invoke-static       JNISoxProxy->getContext()Context
65 00001A34  move-result-object  v11
66 00001A36  invoke-virtual      Context->getFilesDir()File, v11
67 00001A3C  move-result-object  v11
68 00001A3E  invoke-virtual      File->getAbsolutePath()String, v11
69 00001A44  move-result-object  v11
70 00001A46  invoke-virtual      StringBuilder->insert(I, String)StringBuilder, v9, v10, v11
71 00001A4C  move-result-object  v9
72 00001A4E  const-string        v10, ")\no\u0004u\u0012s\u0004(\u0015i\u001E"  # /libstub.sox
73 00001A52  invoke-static       yb->iiIIIiiiIi(String)String, v10
74 00001A58  move-result-object  v10
75 00001A5A  invoke-virtual      StringBuilder->append(String)StringBuilder, v9, v10
76 00001A60  move-result-object  v9
77 00001A62  invoke-virtual      StringBuilder->toString()String, v9
78 00001A68  move-result-object  v9
79 00001A6A  invoke-direct       File-><init>(String)V, v6, v9
80 00001A70  invoke-virtual      File->delete()Z, v6

4. 解密libstub.sox模块。

解密函数在类com/inca/security/qb中iiIIIiiiIi函数,代码如下:

  1    @SuppressLint(value={"SdCardPath"}) public boolean iiIIIiiiIi(String arg25, String arg26, byte[] arg27) throws IOException, InvalidKeyException {
  2         Object v18;
  3         Object v5_2;
  4         long v16_1;
  5         Method v8_3;
  6         Class v11_2;
  7         Object v7_2;
  8         Object v4_7;
  9         Method v15;  // doFinal
 10         Method v14_1;  // init java.security.Key
 11         Object v13_1;  // RSA/ECB/PKCS1Padding
 12         int v8_1;
 13         int v7;
 14         FileInputStream v13;
 15         Method v4_6;
 16         byte[] v7_1;
 17         boolean v4_2;
 18         Method v5_1;  // read
 19         byte[] v12;
 20         byte[] v11;
 21         Object v10;  // /
 22         Class v9;  // java.io.FileInputStream
 23         try {
 24             v9 = Class.forName(vb.iiIIIiiiIi("&3:3b;#|\n; 7\u0005<<\'8\u00018 )3!"));  // java.io.FileInputStream
 25             Constructor v4_1 = v9.getConstructor(String.class);
 26             v10 = v4_1.newInstance(arg25.indexOf(yb.iiIIIiiiIi("I")) == 0 ? arg25 : new StringBuilder().insert(0, this.iiIiiiIIIi).append(arg25).toString());  // /
 27             v11 = new byte[16];
 28             v12 = new byte[4];
 29             v5_1 = v9.getMethod(vb.iiIIIiiiIi(" )3("), byte[].class, Integer.TYPE, Integer.TYPE);  // read
 30             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(3));
 31             if(v11[0] == 83 && v11[1] == 79 && v11[2] == 88) {  // 判断开头是否为SOX
 32                 goto label_82;
 33             }
 34 
 35             v4_2 = false;
 36             return v4_2;
 37         }
 38         catch(Exception v4) {
 39             goto label_78;
 40         }
 41 
 42     label_82:
 43         int v4_3 = 3;
 44         try {
 45             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(2));
 46             if((((short)((((short)v11[0])) | (((short)v11[1])) << 8))) != 1) {
 47                 return false;
 48             }
 49 
 50             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(1));
 51             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(2));
 52             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(2));
 53             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(4));
 54             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(4));
 55             v5_1.invoke(v10, v12, Integer.valueOf(0), Integer.valueOf(4));
 56             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(12));
 57             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(16));
 58             v5_1.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(16));
 59             byte[] v4_5 = null;
 60             if(v11[0] == 0 || v11[1] == 0 || v11[14] == 0 || v11[15] == 0) {
 61                 v7_1 = v4_5;
 62                 v4_6 = v5_1;
 63                 goto label_291;
 64             label_276:
 65                 while(v7 < 64) {
 66                     v13.read(v11);
 67                     if(v8_1 == v14) {
 68                         v4_5 = new byte[16];
 69                         System.arraycopy(v11, 0, v4_5, 0, 16);
 70                     }
 71 
 72                     v7 = v8_1 + 1;
 73                     v8_1 = v7;
 74                 }
 75 
 76                 v13.close();
 77                 v7_1 = v4_5;
 78                 v4_6 = v5_1;
 79             }
 80             else {
 81                 File v8 = new File(String.format(yb.iiIIIiiiIi("CuI#\u0015(\u0012v\r"), arg25.substring(0, arg25.lastIndexOf(47)), qb.iiIIIiiiIi(v11)));  // %s/%s.tpk
 82                 if(v8.exists()) {
 83                     v13 = new FileInputStream(v8);
 84                     v13.read(v11);
 85                     int v14 = (Math.abs(v11[0] << 24 | v11[4] << 16 | v11[8] << 8 | v11[12]) + 1) % 64;
 86                     v7 = 1;
 87                     v8_1 = 1;
 88                     goto label_276;
 89                 }
 90                 else {
 91                     return false;
 92                 }
 93             }
 94 
 95         label_291:
 96             v4_6.invoke(v10, v11, Integer.valueOf(0), Integer.valueOf(4));
 97             v4_5 = new byte[(v11[3] & 255) << 24 | 0 | (v11[2] & 255) << 16 | (v11[1] & 255) << 8 | v11[0] & 255];
 98             v5_1 = v9.getMethod(vb.iiIIIiiiIi(" )3("), byte[].class);  // read
 99             v5_1.invoke(v10, v4_5);
100             Class v8_2 = Class.forName(yb.iiIIIiiiIi("\fg\u0010g\u001E(\u0005t\u001Fv\u0012iHE\u000Fv\u000Ec\u0014"));  // javax.crypto.Cipher
101             Method v11_1 = v8_2.getMethod(vb.iiIIIiiiIi("+78\u001B\"!83\"1)"), String.class);  // getInstance
102             v13_1 = v11_1.invoke(null, yb.iiIIIiiiIi("T5GIC%DIV-E576g\u0002b\u000Fh\u0001"));  // RSA/ECB/PKCS1Padding
103             v14_1 = v8_2.getMethod(vb.iiIIIiiiIi(";\";8"), Integer.TYPE, Class.forName(yb.iiIIIiiiIi("\fg\u0010gHu\u0003e\u0013t\u000Fr\u001F(-c\u001F")));  // init java.security.Key
104             v14_1.invoke(v13_1, Integer.valueOf(2), this.iIiIIiIiIi);
105             v15 = v8_2.getMethod(vb.iiIIIiiiIi("(=\n;\"3 "), byte[].class);  // doFinal
106             v4_7 = v15.invoke(v13_1, v4_5);
107             if(v7_1 != null) {
108                 v13_1 = v11_1.invoke(null, yb.iiIIIiiiIi("\'C5"));  // AES
109                 v14_1.invoke(v13_1, Integer.valueOf(2), Class.forName(vb.iiIIIiiiIi("&3:34|/ 5\"8=b!<7/|\u001F7/ )&\u000775\u0001<7/")).getConstructor(byte[].class, String.class).newInstance(v7_1, yb.iiIIIiiiIi("\'C5")));  // javax.crypto.spec.SecretKeySpec AES
110                 v4_7 = v15.invoke(v13_1, v4_7);
111             }
112 
113             v7_2 = null;
114             v7_2 = v11_1.invoke(v7_2, vb.iiIIIiiiIi("\r\u0017\u001F"));
115             v14_1.invoke(v7_2, Integer.valueOf(2), Class.forName(yb.iiIIIiiiIi("\fg\u0010g\u001E(\u0005t\u001Fv\u0012iHu\u0016c\u0005(5c\u0005t\u0003r-c\u001FU\u0016c\u0005")).getConstructor(byte[].class, String.class).newInstance(v4_7, vb.iiIIIiiiIi("\r\u0017\u001F")));
116             v11_2 = Class.forName(yb.iiIIIiiiIi("\fg\u0010gHo\t($\u007F\u0012c\'t\u0014g\u001FI\u0013r\u0016s\u0012U\u0012t\u0003g\u000B"));
117             v13_1 = v11_2.getConstructor(null).newInstance(null);
118             byte[] v14_2 = new byte[1024];
119             v15 = v8_2.getMethod(vb.iiIIIiiiIi("\'<6-&)"), byte[].class, Integer.TYPE, Integer.TYPE);
120             Method v16 = v11_2.getMethod(yb.iiIIIiiiIi("\u0011t\u000Fr\u0003"), byte[].class);
121             for(v4_6 = v5_1; true; v4_6 = v5_1) {
122                 v4_3 = v4_6.invoke(v10, v14_2).intValue();
123                 if(v4_3 == -1) {
124                     break;
125                 }
126 
127                 v16.invoke(v13_1, v15.invoke(v7_2, v14_2, Integer.valueOf(0), Integer.valueOf(v4_3)));
128             }
129 
130             v16.invoke(v13_1, v8_2.getMethod(vb.iiIIIiiiIi("(=\n;\"3 "), null).invoke(v7_2, null));
131             v4_7 = v11_2.getMethod(yb.iiIIIiiiIi("\u0012i$\u007F\u0012c\'t\u0014g\u001F"), null).invoke(v13_1, null);
132             if(arg25.indexOf(vb.iiIIIiiiIi("c")) != 0) {
133                 arg26 = new StringBuilder().insert(0, this.iiIiiiIIIi).append(arg26).toString();
134             }
135 
136             Class v7_3 = Class.forName(yb.iiIIIiiiIi("l\u0007p\u0007(\u000FiH@\u000Fj\u0003I\u0013r\u0016s\u0012U\u0012t\u0003g\u000B"));
137             v8_3 = v7_3.getMethod(vb.iiIIIiiiIi("; %&)"), byte[].class);
138             v14_1 = v7_3.getMethod(yb.iiIIIiiiIi("\u0005j\tu\u0003"), null);
139             v15 = v7_3.getMethod(vb.iiIIIiiiIi("*>9!$"), null);
140             v7_2 = v7_3.getConstructor(String.class).newInstance(arg26);
141             v16_1 = na.iIIIiiiIII(((byte[])v4_7), 5);
142             v5_2 = null;
143         }
144         catch(Exception v4) {
145             goto label_78;
146         }
147 
148         try {
149             v18 = Binder.getReserved1();
150             if(v18 == null) {
151                 goto label_761;
152             }
153         }
154         catch(Exception v4) {
155             goto label_760;
156         }
157 
158         try {
159             v5_2 = v18.getClass().getMethod(yb.iiIIIiiiIi("o/o/O\u000Fo/o/"), byte[].class, Integer.TYPE).invoke(v18, v4_7, Integer.valueOf(((int)v16_1)));
160         }
161         catch(Exception v4) {
162             try {
163                 v4.printStackTrace();
164                 goto label_659;
165             label_761:
166                 byte[] v5_3 = AppGuardEngine.iiIIIiiiIi(((byte[])v4_7), ((int)v16_1));  // 传入SO层解密 (该Native函数在compatible.so进行动态注册)
167             label_760:
168             }
169             catch(Exception v4) {
170                 goto label_760;
171             }
172         }
173 
174     label_659:
175         v4_3 = 3;
176         try {
177             int v12_1 = v12[0] & 255 | ((v12[v4_3] & 255) << 24 | 0 | (v12[2] & 255) << 16 | (v12[1] & 255) << 8);
178             Class v16_2 = Class.forName(vb.iiIIIiiiIi("&3:3b\'8; |6;<|\r6 7>a~"));
179             Object v17 = v16_2.getConstructor(null).newInstance(null);
180             v16_2.getMethod(yb.iiIIIiiiIi("s\u0016b\u0007r\u0003"), byte[].class, Integer.TYPE, Integer.TYPE).invoke(v17, v5_2, Integer.valueOf(0), Integer.valueOf(v5_2.length));
181             v16_1 = v16_2.getMethod(vb.iiIIIiiiIi("5)&\u001A3 \')"), null).invoke(v17, null).longValue();
182             if(v12_1 != 0 && v12_1 != (((int)v16_1))) {
183                 v14_1.invoke(v7_2, null);
184                 v4_2 = false;
185             }
186             else {
187                 v8_3.invoke(v7_2, v5_2);
188                 v15.invoke(v7_2, null);
189                 v14_1.invoke(v7_2, null);
190                 v9.getMethod(yb.iiIIIiiiIi("\u0005j\tu\u0003"), null).invoke(v10, null);
191                 v11_2.getMethod(vb.iiIIIiiiIi("/>#!)"), null).invoke(v13_1, null);
192                 v9.getMethod(yb.iiIIIiiiIi("\u0005j\tu\u0003"), null).invoke(v10, null);
193                 v4_2 = true;
194             }
195 
196             return v4_2;
197         }
198         catch(Exception v4) {
199         label_78:
200             Exception v5_4 = v4;
201             v4_2 = false;
202             v5_4.printStackTrace();
203             return v4_2;
204         }
205     }

java层AES解密再传入传入so层解密private static native byte[] iIiIIIiIiI(byte[] arg0, int arg1)。

5. 解密libengine.sox模块

在Lcom/inca/security/Core/AppGuardEngine;->iiIIIiiiIi([B)Z生成一个随机数后SHA1后字会串做为解密后的文件名存放在/data/data/包名/files/目录下,解密函数与上一步相同。

生成随机数代码:

 1 .method private synthetic iiIIIiiiIi([B)Z
 2           .registers 12
 3           .annotation build SuppressLint
 4               value = {
 5                   "TrulyRandom"
 6               }
 7           .end annotation
 8           .annotation system Throws
 9               value = {
10                   AppGuardException
11               }
12           .end annotation
13 00000000  const/4             v9, 2
14 00000002  const/16            v8, -0x007E
15 00000006  const/16            v7, 0x0030
16 0000000A  const/4             v2, 0
17 0000000C  const/4             v3, 1
18 :E
19 0000000E  const-string        v1, "U.GW"  # SHA1
20 00000012  invoke-static       yb->iiIIIiiiIi(String)String, v1
21 00000018  move-result-object  v1
22 0000001A  invoke-static       MessageDigest->getInstance(String)MessageDigest, v1
23 :20
24 00000020  move-result-object  v1
25 :22
26 00000022  new-instance        v4, SecureRandom
27 00000026  invoke-direct       SecureRandom-><init>()V, v4
28 0000002C  const/16            v5, 0x0100
29 00000030  new-array           v5, v5, [B
30 00000034  const/16            v6, 0x0126
31 00000038  invoke-virtual      SecureRandom->nextBytes([B)V, v4, v5
32 0000003E  invoke-virtual      MessageDigest->update([B)V, v1, v5
33 00000044  invoke-virtual      SecureRandom->nextBytes([B)V, v4, v5
34 0000004A  invoke-virtual      MessageDigest->update([B)V, v1, v5
35 00000050  new-instance        v4, BigInteger
36 00000054  invoke-virtual      MessageDigest->digest()[B, v1
37 0000005A  move-result-object  v1
38 0000005C  invoke-direct       BigInteger-><init>(I, [B)V, v4, v3, v1
39 00000062  const/16            v1, 0x0010
40 00000066  invoke-virtual      BigInteger->toString(I)String, v4, v1  # 随机数后SHA1值
41 0000006C  move-result-object  v1
42 0000006E  iput-object         v1, p0, AppGuardEngine->IiIIiiiiii_Random_SHA1:String  # 解密后文件名
43 //解密并调用
44 00000D7A  new-instance        v4, qb
45 00000D7E  invoke-static       JNISoxProxy->getContext()Context
46 00000D84  move-result-object  v5
47 00000D86  invoke-direct       qb-><init>(Context)V, v4, v5
48 00000D8C  const-string        v5, "fChOdMcDo\u0004yEr"  # libengine.sox
49 00000D90  invoke-virtual      qb->iiIIIiiiIi([B)V, v4, v1
50 00000D96  invoke-static       b->iiIIIiiiIi(String)String, v5
51 00000D9C  move-result-object  v1
52 00000D9E  iget-object         v5, p0, AppGuardEngine->IiIIiiiiii_Random_SHA1:String
53 00000DA2  const/4             v6, 0
54 00000DA4  invoke-virtual      qb->iiIIIiiiIi(String, String, [B)Z, v4, v1, v5, v6  # 解密libengine.sox(最终传入so层解密private static native byte[] iIiIIIiIiI(byte[] arg0, int arg1))
55 :DAA
56 00000DAA  move-object         v0, p0
57 :DAC
58 00000DAC  invoke-static       JNISoxProxy->getContext()Context
59 00000DB2  move-result-object  v1
60 00000DB4  new-instance        v4, StringBuilder
61 00000DB8  invoke-direct       StringBuilder-><init>()V, v4
62 00000DBE  invoke-static       JNISoxProxy->getContext()Context
63 00000DC4  move-result-object  v5
64 00000DC6  invoke-virtual      Context->getFilesDir()File, v5
65 00000DCC  move-result-object  v5
66 00000DCE  invoke-virtual      File->getAbsolutePath()String, v5
67 00000DD4  move-result-object  v5
68 00000DD6  invoke-virtual      StringBuilder->insert(I, String)StringBuilder, v4, v2, v5
69 00000DDC  move-result-object  v4
70 00000DDE  const-string        v5, "%"  # /
71 00000DE2  invoke-static       b->iiIIIiiiIi(String)String, v5
72 00000DE8  move-result-object  v5
73 00000DEA  invoke-virtual      StringBuilder->append(String)StringBuilder, v4, v5
74 00000DF0  move-result-object  v4
75 00000DF2  iget-object         v5, p0, AppGuardEngine->IiIIiiiiii_Random_SHA1:String
76 00000DF6  invoke-virtual      StringBuilder->append(String)StringBuilder, v4, v5
77 00000DFC  move-result-object  v4
78 00000DFE  invoke-virtual      StringBuilder->toString()String, v4
79 00000E04  move-result-object  v4
80 00000E06  invoke-direct       AppGuardEngine->IIIIIIIlIl(Context, String, [B)I, v0, v1, v4, p1  # 将解密后将libengine文件路径传入该Native函数中调用
81 00000E0C  move-result         v1
82 00000E0E  if-gez              v1, :E9A

解密后的so会在Native函数中通过dlopen、dlsym来调用。

二: compatible.so反调试与反反调试

1. 反调试 (文件偏移 13284)

 1 /data/app-lib/com.digitalsky.girlsfrontline.cn-1/libcompatible.so    757C8000    0005F000
 2 .text:757DB284             loc_757DB284                            ; CODE XREF: JNI_OnLoad+254↑j
 3 .text:757DB284 00 00 5C E3 CMP     R12, #0
 4 .text:757DB288 18 00 00 BA BLT     loc_757DB2F0
 5 .text:757DB28C 00 30 68 E2 RSB     R3, R8, #0
 6 .text:757DB290 03 00 20 E0 EOR     R0, R0, R3
 7 .text:757DB294 08 80 80 E0 ADD     R8, R0, R8
 8 .text:757DB298 0D 00 58 E3 CMP     R8, #0xD                        ; 判断SDK版本
 9 .text:757DB29C 9F FF FF DA BLE     loc_757DB120
10 .text:757DB2A0
11 .text:757DB2A0             loc_757DB2A0                            ; CODE XREF: JNI_OnLoad+2E4↓j
12 .text:757DB2A0 7D 2B 00 EB BL      _Z11lIlIlIIIIIIv                ; 创建3进程和多线程反调试
13 .text:757DB2A4 00 20 50 E2 SUBS    R2, R0, #0                      ; char *

如果SDK大于0XD时就创建3进程与多线程反调试:

  1 .text:756F84B0             EXPORT _Z11IIIIIIIllllv
  2 .text:756F84B0             _Z11IIIIIIIllllv                        ; CODE XREF: JNI_OnLoad:loc_756EE6E4↑p
  3 .text:756F84B0
  4 .text:756F84B0             var_2C= -0x2C
  5 .text:756F84B0             var_28= -0x28
  6 .text:756F84B0             var_24= -0x24
  7 .text:756F84B0             var_20= -0x20
  8 .text:756F84B0
  9 .text:756F84B0             ; __unwind {
 10 .text:756F84B0 F0 43 2D E9 STMFD   SP!, {R4-R9,LR}
 11 .text:756F84B4 C0 43 9F E5 LDR     R4, =(_GLOBAL_OFFSET_TABLE_ - 0x756F84C8)
 12 .text:756F84B8 C0 23 9F E5 LDR     R2, =(__stack_chk_guard_ptr - 0x7572FED0)
 13 .text:756F84BC C0 33 9F E5 LDR     R3, =(_ZN6Global10lIlIIllIIlE_ptr - 0x7572FED0)
 14 .text:756F84C0 04 40 8F E0 ADD     R4, PC, R4                      ; _GLOBAL_OFFSET_TABLE_
 15 .text:756F84C4 02 70 94 E7 LDR     R7, [R4,R2]
 16 .text:756F84C8 14 D0 4D E2 SUB     SP, SP, #0x14
 17 .text:756F84CC 00 20 97 E5 LDR     R2, [R7]
 18 .text:756F84D0 0C 20 8D E5 STR     R2, [SP,#0x30+var_24]
 19 .text:756F84D4 03 60 94 E7 LDR     R6, [R4,R3]
 20 .text:756F84D8 06 00 A0 E1 MOV     R0, R6                          ; int *
 21 .text:756F84DC 72 F2 FF EB BL      pipi
 22 .text:756F84E0 00 00 50 E3 CMP     R0, #0
 23 .text:756F84E4 13 00 00 BA BLT     loc_756F8538
 24 .text:756F84E8 08 00 86 E2 ADD     R0, R6, #8                      ; int *
 25 .text:756F84EC 6E F2 FF EB BL      pipi
 26 .text:756F84F0 00 00 50 E3 CMP     R0, #0
 27 .text:756F84F4 0F 00 00 BA BLT     loc_756F8538
 28 .text:756F84F8 48 00 86 E2 ADD     R0, R6, #0x48                   ; int *
 29 .text:756F84FC 6A F2 FF EB BL      pipi
 30 .text:756F8500 00 00 50 E3 CMP     R0, #0
 31 .text:756F8504 0B 00 00 BA BLT     loc_756F8538
 32 .text:756F8508 30 00 86 E2 ADD     R0, R6, #0x30                   ; int *
 33 .text:756F850C 66 F2 FF EB BL      pipi
 34 .text:756F8510 00 00 50 E3 CMP     R0, #0
 35 .text:756F8514 07 00 00 BA BLT     loc_756F8538
 36 .text:756F8518 38 00 86 E2 ADD     R0, R6, #0x38                   ; int *
 37 .text:756F851C 62 F2 FF EB BL      pipi
 38 .text:756F8520 00 00 50 E3 CMP     R0, #0
 39 .text:756F8524 03 00 00 BA BLT     loc_756F8538
 40 .text:756F8528 40 00 86 E2 ADD     R0, R6, #0x40                   ; int *
 41 .text:756F852C 5E F2 FF EB BL      pipi
 42 .text:756F8530 00 00 50 E3 CMP     R0, #0
 43 .text:756F8534 01 00 00 AA BGE     loc_756F8540
 44 .text:756F8538
 45 .text:756F8538             loc_756F8538                            ; CODE XREF: IIIIIIIllll(void)+34↑j
 46 .text:756F8538                                                     ; IIIIIIIllll(void)+44↑j ...
 47 .text:756F8538 00 00 A0 E3 MOV     R0, #0                          ; int
 48 .text:756F853C 4E F2 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
 49 .text:756F8540
 50 .text:756F8540             loc_756F8540                            ; CODE XREF: IIIIIIIllll(void)+84↑j
 51 .text:756F8540 01 10 A0 E3 MOV     R1, #1
 52 .text:756F8544 04 00 A0 E3 MOV     R0, #4                          ; option
 53 .text:756F8548 AF CB FF EB BL      prctl
 54 .text:756F854C 72 F2 FF EB BL      getpid_0
 55 .text:756F8550 30 33 9F E5 LDR     R3, =(_ZN6Global10lIllllIllIE_ptr - 0x7572FED0)
 56 .text:756F8554 03 50 94 E7 LDR     R5, [R4,R3]
 57 .text:756F8558 00 00 85 E5 STR     R0, [R5]                        ; Global::lIllllIllI
 58 .text:756F855C 60 F2 FF EB BL      fork
 59 .text:756F8560 01 00 70 E3 CMN     R0, #1
 60 .text:756F8564 04 00 85 E5 STR     R0, [R5,#(dword_757309F4 - 0x757309F0)]
 61 .text:756F8568 92 00 00 0A BEQ     loc_756F87B8
 62 .text:756F856C
 63 .text:756F856C             loc_756F856C                            ; CODE XREF: IIIIIIIllll(void)+314↓j
 64 .text:756F856C 00 00 50 E3 CMP     R0, #0
 65 .text:756F8570 34 00 00 DA BLE     loc_756F8648
 66 .text:756F8574 00 80 A0 E3 MOV     R8, #0
 67 .text:756F8578 01 90 A0 E3 MOV     R9, #1
 68 .text:756F857C 08 33 9F E5 LDR     R3, =(_ZN6Global10IIlIIlIIlIE_ptr - 0x7572FED0)
 69 .text:756F8580 10 10 8D E2 ADD     R1, SP, #0x30+var_20
 70 .text:756F8584 38 00 96 E5 LDR     R0, [R6,#(dword_75730EBC - 0x75730E84)] ; int
 71 .text:756F8588 03 30 94 E7 LDR     R3, [R4,R3]
 72 .text:756F858C 04 20 A0 E3 MOV     R2, #4                          ; unsigned int
 73 .text:756F8590 10 80 21 E5 STR     R8, [R1,#-0x10]!
 74 .text:756F8594 00 90 C3 E5 STRB    R9, [R3]                        ; Global::IIlIIlIIlI
 75 .text:756F8598 7B F2 FF EB BL      read
 76 .text:756F859C EC 12 9F E5 LDR     R1, =(_ZN6Global6ThreadE_ptr - 0x7572FED0)
 77 .text:756F85A0 EC 22 9F E5 LDR     R2, =(_Z10IlIIlllIIlPv_ptr - 0x7572FED0)
 78 .text:756F85A4 04 30 85 E2 ADD     R3, R5, #4                      ; void *
 79 .text:756F85A8 01 60 94 E7 LDR     R6, [R4,R1]
 80 .text:756F85AC 02 20 94 E7 LDR     R2, [R4,R2]                     ; void *(__cdecl *)(void *)
 81 .text:756F85B0 08 10 A0 E1 MOV     R1, R8                          ; pthread_attr_t *
 82 .text:756F85B4 06 00 A0 E1 MOV     R0, R6                          ; int *
 83 .text:756F85B8 6D F1 FF EB BL      pthread_create_0
 84 .text:756F85BC 08 00 50 E1 CMP     R0, R8
 85 .text:756F85C0 80 00 00 BA BLT     loc_756F87C8
 86 .text:756F85C4
 87 .text:756F85C4             loc_756F85C4                            ; CODE XREF: IIIIIIIllll(void)+334↓j
 88 .text:756F85C4 CC 32 9F E5 LDR     R3, =(_Z10IIlIlllllIPv_ptr - 0x7572FED0)
 89 .text:756F85C8 04 00 86 E2 ADD     R0, R6, #4                      ; int *
 90 .text:756F85CC 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
 91 .text:756F85D0 03 20 94 E7 LDR     R2, [R4,R3]                     ; void *(__cdecl *)(void *)
 92 .text:756F85D4 09 30 A0 E3 MOV     R3, #9                          ; void *
 93 .text:756F85D8 65 F1 FF EB BL      pthread_create_0
 94 .text:756F85DC 00 00 50 E3 CMP     R0, #0
 95 .text:756F85E0 6C 00 00 BA BLT     loc_756F8798
 96 .text:756F85E4
 97 .text:756F85E4             loc_756F85E4                            ; CODE XREF: IIIIIIIllll(void)+304↓j
 98 .text:756F85E4 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
 99 .text:756F85E8 AC 22 9F E5 LDR     R2, =(_Z11IIIlllIIIIIPv_ptr - 0x7572FED0)
100 .text:756F85EC 01 30 A0 E1 MOV     R3, R1                          ; void *
101 .text:756F85F0 02 20 94 E7 LDR     R2, [R4,R2]                     ; void *(__cdecl *)(void *)
102 .text:756F85F4 10 00 86 E2 ADD     R0, R6, #0x10                   ; int *
103 .text:756F85F8 5D F1 FF EB BL      pthread_create_0
104 .text:756F85FC 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
105 .text:756F8600 98 22 9F E5 LDR     R2, =(_Z11IIIlIIlIllIPv_ptr - 0x7572FED0)
106 .text:756F8604 01 30 A0 E1 MOV     R3, R1                          ; void *
107 .text:756F8608 02 20 94 E7 LDR     R2, [R4,R2]                     ; void *(__cdecl *)(void *)
108 .text:756F860C 04 00 8D E2 ADD     R0, SP, #0x30+var_2C            ; int *
109 .text:756F8610 57 F1 FF EB BL      pthread_create_0
110 .text:756F8614 88 32 9F E5 LDR     R3, =(_Z10IIllIIlIlIPv_ptr - 0x7572FED0)
111 .text:756F8618 08 00 8D E2 ADD     R0, SP, #0x30+var_28            ; int *
112 .text:756F861C 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
113 .text:756F8620 03 20 94 E7 LDR     R2, [R4,R3]                     ; void *(__cdecl *)(void *)
114 .text:756F8624 01 30 A0 E3 MOV     R3, #1                          ; void *
115 .text:756F8628 51 F1 FF EB BL      pthread_create_0
116 .text:756F862C
117 .text:756F862C             loc_756F862C                            ; CODE XREF: IIIIIIIllll(void)+250↓j
118 .text:756F862C 0C 20 9D E5 LDR     R2, [SP,#0x30+var_24]
119 .text:756F8630 00 30 97 E5 LDR     R3, [R7]
120 .text:756F8634 01 00 A0 E3 MOV     R0, #1
121 .text:756F8638 03 00 52 E1 CMP     R2, R3
122 .text:756F863C 8D 00 00 1A BNE     loc_756F8878
123 .text:756F8640 14 D0 8D E2 ADD     SP, SP, #0x14
124 .text:756F8644 F0 83 BD E8 LDMFD   SP!, {R4-R9,PC}
125 .text:756F8648             ; ---------------------------------------------------------------------------
126 .text:756F8648
127 .text:756F8648             loc_756F8648                            ; CODE XREF: IIIIIIIllll(void)+C0↑j
128 .text:756F8648 72 CB FF EB BL      getpid
129 .text:756F864C 04 00 85 E5 STR     R0, [R5,#(dword_757309F4 - 0x757309F0)]
130 .text:756F8650 23 F2 FF EB BL      fork
131 .text:756F8654 04 10 85 E2 ADD     R1, R5, #4                      ; void *
132 .text:756F8658 08 00 85 E5 STR     R0, [R5,#(dword_757309F8 - 0x757309F0)]
133 .text:756F865C 04 20 A0 E3 MOV     R2, #4                          ; unsigned int
134 .text:756F8660 3C 00 96 E5 LDR     R0, [R6,#(dword_75730EC0 - 0x75730E84)] ; int
135 .text:756F8664 56 F2 FF EB BL      write_0
136 .text:756F8668 08 30 95 E5 LDR     R3, [R5,#(dword_757309F8 - 0x757309F0)]
137 .text:756F866C 01 00 73 E3 CMN     R3, #1
138 .text:756F8670 64 00 00 0A BEQ     loc_756F8808
139 .text:756F8674
140 .text:756F8674             loc_756F8674                            ; CODE XREF: IIIIIIIllll(void)+364↓j
141 .text:756F8674 00 00 53 E3 CMP     R3, #0
142 .text:756F8678 01 00 A0 E3 MOV     R0, #1                          ; option
143 .text:756F867C 09 10 A0 E3 MOV     R1, #9
144 .text:756F8680 1F 00 00 DA BLE     loc_756F8704
145 .text:756F8684 60 CB FF EB BL      prctl
146 .text:756F8688 00 12 9F E5 LDR     R1, =(_ZN6Global6ThreadE_ptr - 0x7572FED0)
147 .text:756F868C 00 22 9F E5 LDR     R2, =(_Z10IlIIlllIIlPv_ptr - 0x7572FED0)
148 .text:756F8690 08 30 85 E2 ADD     R3, R5, #8                      ; void *
149 .text:756F8694 01 60 94 E7 LDR     R6, [R4,R1]
150 .text:756F8698 02 20 94 E7 LDR     R2, [R4,R2]                     ; void *(__cdecl *)(void *)
151 .text:756F869C 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
152 .text:756F86A0 06 00 A0 E1 MOV     R0, R6                          ; int *
153 .text:756F86A4 32 F1 FF EB BL      pthread_create_0
154 .text:756F86A8 00 00 50 E3 CMP     R0, #0
155 .text:756F86AC 59 00 00 BA BLT     loc_756F8818
156 .text:756F86B0
157 .text:756F86B0             loc_756F86B0                            ; CODE XREF: IIIIIIIllll(void)+384↓j
158 .text:756F86B0 E0 31 9F E5 LDR     R3, =(_Z10IIlIlllllIPv_ptr - 0x7572FED0)
159 .text:756F86B4 04 00 86 E2 ADD     R0, R6, #4                      ; int *
160 .text:756F86B8 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
161 .text:756F86BC 03 20 94 E7 LDR     R2, [R4,R3]                     ; void *(__cdecl *)(void *)
162 .text:756F86C0 01 30 A0 E3 MOV     R3, #1                          ; void *
163 .text:756F86C4 2A F1 FF EB BL      pthread_create_0
164 .text:756F86C8 00 00 50 E3 CMP     R0, #0
165 .text:756F86CC 45 00 00 BA BLT     loc_756F87E8
166 .text:756F86D0
167 .text:756F86D0             loc_756F86D0                            ; CODE XREF: IIIIIIIllll(void)+354↓j
168 .text:756F86D0 CC 31 9F E5 LDR     R3, =(_Z10IIllIIlIlIPv_ptr - 0x7572FED0)
169 .text:756F86D4 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
170 .text:756F86D8 03 20 94 E7 LDR     R2, [R4,R3]                     ; void *(__cdecl *)(void *)
171 .text:756F86DC 02 30 A0 E3 MOV     R3, #2                          ; void *
172 .text:756F86E0 08 00 8D E2 ADD     R0, SP, #0x30+var_28            ; int *
173 .text:756F86E4
174 .text:756F86E4             loc_756F86E4                            ; CODE XREF: IIIIIIIllll(void)+2E4↓j
175 .text:756F86E4 22 F1 FF EB BL      pthread_create_0
176 .text:756F86E8 08 00 9D E5 LDR     R0, [SP,#0x30+var_28]           ; int
177 .text:756F86EC 00 10 A0 E3 MOV     R1, #0                          ; void **
178 .text:756F86F0 A9 F1 FF EB BL      pthread_join
179 .text:756F86F4 00 00 96 E5 LDR     R0, [R6]                        ; int
180 .text:756F86F8 00 10 A0 E3 MOV     R1, #0                          ; void **
181 .text:756F86FC A6 F1 FF EB BL      pthread_join
182 .text:756F8700 C9 FF FF EA B       loc_756F862C
183 .text:756F8704             ; ---------------------------------------------------------------------------
184 .text:756F8704
185 .text:756F8704             loc_756F8704                            ; CODE XREF: IIIIIIIllll(void)+1D0↑j
186 .text:756F8704 40 CB FF EB BL      prctl
187 .text:756F8708 03 F2 FF EB BL      getpid_0
188 .text:756F870C 05 10 A0 E1 MOV     R1, R5
189 .text:756F8710 04 20 A0 E3 MOV     R2, #4                          ; unsigned int
190 .text:756F8714 08 00 A1 E5 STR     R0, [R1,#(dword_757309F8 - 0x757309F0)]!
191 .text:756F8718 34 00 96 E5 LDR     R0, [R6,#(dword_75730EB8 - 0x75730E84)] ; int
192 .text:756F871C 28 F2 FF EB BL      write_0
193 .text:756F8720 68 21 9F E5 LDR     R2, =(_ZN6Global6ThreadE_ptr - 0x7572FED0)
194 .text:756F8724 68 31 9F E5 LDR     R3, =(_Z10IlIIlllIIlPv_ptr - 0x7572FED0)
195 .text:756F8728 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
196 .text:756F872C 02 60 94 E7 LDR     R6, [R4,R2]
197 .text:756F8730 03 20 94 E7 LDR     R2, [R4,R3]                     ; void *(__cdecl *)(void *)
198 .text:756F8734 05 30 A0 E1 MOV     R3, R5                          ; void *
199 .text:756F8738 06 00 A0 E1 MOV     R0, R6                          ; int *
200 .text:756F873C 0C F1 FF EB BL      pthread_create_0
201 .text:756F8740 00 00 50 E3 CMP     R0, #0
202 .text:756F8744 43 00 00 BA BLT     loc_756F8858
203 .text:756F8748
204 .text:756F8748             loc_756F8748                            ; CODE XREF: IIIIIIIllll(void)+3C4↓j
205 .text:756F8748 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
206 .text:756F874C 44 21 9F E5 LDR     R2, =(_Z10IIlIlllllIPv_ptr - 0x7572FED0)
207 .text:756F8750 01 30 A0 E1 MOV     R3, R1                          ; void *
208 .text:756F8754 02 20 94 E7 LDR     R2, [R4,R2]                     ; void *(__cdecl *)(void *)
209 .text:756F8758 04 00 86 E2 ADD     R0, R6, #4                      ; int *
210 .text:756F875C 04 F1 FF EB BL      pthread_create_0
211 .text:756F8760 00 00 50 E3 CMP     R0, #0
212 .text:756F8764 33 00 00 BA BLT     loc_756F8838
213 .text:756F8768
214 .text:756F8768             loc_756F8768                            ; CODE XREF: IIIIIIIllll(void)+3A4↓j
215 .text:756F8768 00 10 A0 E3 MOV     R1, #0                          ; pthread_attr_t *
216 .text:756F876C 30 21 9F E5 LDR     R2, =(_Z10IIllIIlIlIPv_ptr - 0x7572FED0)
217 .text:756F8770 01 30 A0 E1 MOV     R3, R1                          ; void *
218 .text:756F8774 02 20 94 E7 LDR     R2, [R4,R2]                     ; void *(__cdecl *)(void *)
219 .text:756F8778 08 00 8D E2 ADD     R0, SP, #0x30+var_28            ; int *
220 .text:756F877C FC F0 FF EB BL      pthread_create_0
221 .text:756F8780 20 21 9F E5 LDR     R2, =(_Z11IlIIllIIlIlPv_ptr - 0x7572FED0)
222 .text:756F8784 05 30 A0 E1 MOV     R3, R5
223 .text:756F8788 02 20 94 E7 LDR     R2, [R4,R2]
224 .text:756F878C 06 00 A0 E1 MOV     R0, R6
225 .text:756F8790 00 10 A0 E3 MOV     R1, #0
226 .text:756F8794 D2 FF FF EA B       loc_756F86E4
227 .text:756F8798             ; ---------------------------------------------------------------------------
228 .text:756F8798
229 .text:756F8798             loc_756F8798                            ; CODE XREF: IIIIIIIllll(void)+130↑j
230 .text:756F8798 01 00 A0 E3 MOV     R0, #1                          ; int
231 .text:756F879C 0E 10 A0 E3 MOV     R1, #0xE                        ; int
232 .text:756F87A0 00 30 A0 E1 MOV     R3, R0                          ; int
233 .text:756F87A4 00 20 A0 E3 MOV     R2, #0                          ; char *
234 .text:756F87A8 DB 12 00 EB BL      _Z10IIIIIllIIliiPKci            ; IIIIIllIIl(int,int,char const*,int)
235 .text:756F87AC 01 00 A0 E3 MOV     R0, #1                          ; int
236 .text:756F87B0 B1 F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
237 .text:756F87B4 8A FF FF EA B       loc_756F85E4
238 .text:756F87B8             ; ---------------------------------------------------------------------------
239 .text:756F87B8
240 .text:756F87B8             loc_756F87B8                            ; CODE XREF: IIIIIIIllll(void)+B8↑j
241 .text:756F87B8 01 00 A0 E3 MOV     R0, #1                          ; int
242 .text:756F87BC AE F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
243 .text:756F87C0 04 00 95 E5 LDR     R0, [R5,#(dword_757309F4 - 0x757309F0)]
244 .text:756F87C4 68 FF FF EA B       loc_756F856C
245 .text:756F87C8             ; ---------------------------------------------------------------------------
246 .text:756F87C8
247 .text:756F87C8             loc_756F87C8                            ; CODE XREF: IIIIIIIllll(void)+110↑j
248 .text:756F87C8 09 00 A0 E1 MOV     R0, R9                          ; int
249 .text:756F87CC 08 20 A0 E1 MOV     R2, R8                          ; char *
250 .text:756F87D0 0D 10 A0 E3 MOV     R1, #0xD                        ; int
251 .text:756F87D4 09 30 A0 E1 MOV     R3, R9                          ; int
252 .text:756F87D8 CF 12 00 EB BL      _Z10IIIIIllIIliiPKci            ; IIIIIllIIl(int,int,char const*,int)
253 .text:756F87DC 09 00 A0 E1 MOV     R0, R9                          ; int
254 .text:756F87E0 A5 F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
255 .text:756F87E4 76 FF FF EA B       loc_756F85C4
256 .text:756F87E8             ; ---------------------------------------------------------------------------
257 .text:756F87E8
258 .text:756F87E8             loc_756F87E8                            ; CODE XREF: IIIIIIIllll(void)+21C↑j
259 .text:756F87E8 01 00 A0 E3 MOV     R0, #1                          ; int
260 .text:756F87EC 0E 10 A0 E3 MOV     R1, #0xE                        ; int
261 .text:756F87F0 00 30 A0 E1 MOV     R3, R0                          ; int
262 .text:756F87F4 00 20 A0 E3 MOV     R2, #0                          ; char *
263 .text:756F87F8 C7 12 00 EB BL      _Z10IIIIIllIIliiPKci            ; IIIIIllIIl(int,int,char const*,int)
264 .text:756F87FC 01 00 A0 E3 MOV     R0, #1                          ; int
265 .text:756F8800 9D F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
266 .text:756F8804 B1 FF FF EA B       loc_756F86D0
267 .text:756F8808             ; ---------------------------------------------------------------------------
268 .text:756F8808
269 .text:756F8808             loc_756F8808                            ; CODE XREF: IIIIIIIllll(void)+1C0↑j
270 .text:756F8808 01 00 A0 E3 MOV     R0, #1                          ; int
271 .text:756F880C 9A F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
272 .text:756F8810 08 30 95 E5 LDR     R3, [R5,#(dword_757309F8 - 0x757309F0)]
273 .text:756F8814 96 FF FF EA B       loc_756F8674
274 .text:756F8818             ; ---------------------------------------------------------------------------
275 .text:756F8818
276 .text:756F8818             loc_756F8818                            ; CODE XREF: IIIIIIIllll(void)+1FC↑j
277 .text:756F8818 01 00 A0 E3 MOV     R0, #1                          ; int
278 .text:756F881C 0D 10 A0 E3 MOV     R1, #0xD                        ; int
279 .text:756F8820 00 30 A0 E1 MOV     R3, R0                          ; int
280 .text:756F8824 00 20 A0 E3 MOV     R2, #0                          ; char *
281 .text:756F8828 BB 12 00 EB BL      _Z10IIIIIllIIliiPKci            ; IIIIIllIIl(int,int,char const*,int)
282 .text:756F882C 01 00 A0 E3 MOV     R0, #1                          ; int
283 .text:756F8830 91 F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
284 .text:756F8834 9D FF FF EA B       loc_756F86B0
285 .text:756F8838             ; ---------------------------------------------------------------------------
286 .text:756F8838
287 .text:756F8838             loc_756F8838                            ; CODE XREF: IIIIIIIllll(void)+2B4↑j
288 .text:756F8838 01 00 A0 E3 MOV     R0, #1                          ; int
289 .text:756F883C 0E 10 A0 E3 MOV     R1, #0xE                        ; int
290 .text:756F8840 00 30 A0 E1 MOV     R3, R0                          ; int
291 .text:756F8844 00 20 A0 E3 MOV     R2, #0                          ; char *
292 .text:756F8848 B3 12 00 EB BL      _Z10IIIIIllIIliiPKci            ; IIIIIllIIl(int,int,char const*,int)
293 .text:756F884C 01 00 A0 E3 MOV     R0, #1                          ; int
294 .text:756F8850 89 F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
295 .text:756F8854 C3 FF FF EA B       loc_756F8768
296 .text:756F8858             ; ---------------------------------------------------------------------------
297 .text:756F8858
298 .text:756F8858             loc_756F8858                            ; CODE XREF: IIIIIIIllll(void)+294↑j
299 .text:756F8858 01 00 A0 E3 MOV     R0, #1                          ; int
300 .text:756F885C 0D 10 A0 E3 MOV     R1, #0xD                        ; int
301 .text:756F8860 00 30 A0 E1 MOV     R3, R0                          ; int
302 .text:756F8864 00 20 A0 E3 MOV     R2, #0                          ; char *
303 .text:756F8868 AB 12 00 EB BL      _Z10IIIIIllIIliiPKci            ; IIIIIllIIl(int,int,char const*,int)
304 .text:756F886C 01 00 A0 E3 MOV     R0, #1                          ; int
305 .text:756F8870 81 F1 FF EB BL      _Z10llIIlIIIlli                 ; llIIlIIIll(int)
306 .text:756F8874 B3 FF FF EA B       loc_756F8748

2.反反调试

过3进程互相调试我是通过hook ptrace直接让它返回0,多线程循环读取进程状态判断是否有调试器,我是通过hook open 函数过虑掉,还有就是直接让SDK版本小于0XD,或者直接NOP掉函数。

 1 int new_ptrace(int request, int pid, int addr, int data){
 2     //LOGD("new_ptrace..");
 3     return 0;
 4 }
 5 int new_open(char *pathname, int oflag, mode_t mode)
 6 {
 7     char* anit  = "stat";
 8     char* tmp = "";
 9     if (NULL == pathname)
10     {
11         goto exitret;
12     }
13     //LOGD("new_open..%s", pathname);
14     if(strstr(pathname, anit) != NULL)
15     {
16         return -1;
17     }
18 exitret:
19     return old_open(pathname, oflag, mode);
20 
21 }

三: compatible.so注册jni函数分析

1.获取动态jni注册函数

通过在dvmUseJNIBridge函数下好断点,来获取注册的jni函数地址,最后注册完后对照表:

注册类名com/inca/security/Core/AppGuardEngine

/data/app-lib/com.digitalsky.girlsfrontline.cn-1/libcompatible.so   757C8000 0005F000

Number     内存地址 函数名       文件偏移   签名  

第1个函数   .text:757D9AF8  IiiiIIiIii (文件偏移 11AF8)  ()I

第2个函数   .text:757DA058  iIiIIIiIiI (文件偏移 12058)  ([BI)[B

第3个函数   .text:757DC268  IiIiiIiIiI (文件偏移 14268)  (Landroid/content/Context;)V

第4个函数   .text:757D9914  IIiIiIIIiI (文件偏移 11914)  (I)V

第5个函数   .text:757D8A28  IIIIiIIIiI (文件偏移 10A28)  (J)V

2. jni函数功能分析

当JNI_OnLoad函数执行完后第一个执行的jni函数是上面注册的第3个函数, 反射获取包名与签名等。

第2个jni函数就是解密libengine.sox与libstub.sox,(assets\appguard\armeabi\)先在上面java层分析时AES解密后数据传入的就是这个函数 (文件偏移 12058)。

 1 .text:757DA058             ; __unwind {
 2 .text:757DA058 F0 43 2D E9 STMFD   SP!, {R4-R9,LR}
 3 .text:757DA05C 02 70 A0 E1 MOV     R7, R2
 4 .text:757DA060 00 20 90 E5 LDR     R2, [R0]
 5 .text:757DA064 00 40 A0 E1 MOV     R4, R0
 6 .text:757DA068 0C D0 4D E2 SUB     SP, SP, #0xC
 7 .text:757DA06C 07 10 A0 E1 MOV     R1, R7
 8 .text:757DA070 AC 22 92 E5 LDR     R2, [R2,#0x2AC]
 9 .text:757DA074 03 50 A0 E1 MOV     R5, R3
10 .text:757DA078 32 FF 2F E1 BLX     R2
11 .text:757DA07C 00 30 94 E5 LDR     R3, [R4]
12 .text:757DA080 07 10 A0 E1 MOV     R1, R7
13 .text:757DA084 00 90 A0 E1 MOV     R9, R0
14 .text:757DA088 E0 32 93 E5 LDR     R3, [R3,#0x2E0]
15 .text:757DA08C 00 20 A0 E3 MOV     R2, #0
16 .text:757DA090 04 00 A0 E1 MOV     R0, R4
17 .text:757DA094 33 FF 2F E1 BLX     R3
18 .text:757DA098 00 80 A0 E1 MOV     R8, R0
19 .text:757DA09C 05 00 A0 E1 MOV     R0, R5                          ; unsigned int
20 .text:757DA0A0 27 1E 00 EB BL      malloc_0                        ; 分配存放空间存放解密后so数据
21 .text:757DA0A4 00 60 A0 E1 MOV     R6, R0
22 .text:757DA0A8 09 10 A0 E1 MOV     R1, R9
23 .text:757DA0AC 08 00 A0 E1 MOV     R0, R8
24 .text:757DA0B0 06 20 A0 E1 MOV     R2, R6
25 .text:757DA0B4 05 30 A0 E1 MOV     R3, R5
26 .text:757DA0B8 BA FF FF EB BL      Dec_sodata                      ; 解密so
27 .text:757DA0BC 00 30 94 E5 LDR     R3, [R4]
28 .text:757DA0C0 08 20 A0 E1 MOV     R2, R8
29 .text:757DA0C4 00 C3 93 E5 LDR     R12, [R3,#0x300]
30 .text:757DA0C8 07 10 A0 E1 MOV     R1, R7
31 .text:757DA0CC 04 00 A0 E1 MOV     R0, R4
32 .text:757DA0D0 02 30 A0 E3 MOV     R3, #2
33 .text:757DA0D4 3C FF 2F E1 BLX     R12
34 .text:757DA0D8 00 30 94 E5 LDR     R3, [R4]
35 .text:757DA0DC 05 10 A0 E1 MOV     R1, R5
36 .text:757DA0E0 04 00 A0 E1 MOV     R0, R4
37 .text:757DA0E4 C0 32 93 E5 LDR     R3, [R3,#0x2C0]
38 .text:757DA0E8 33 FF 2F E1 BLX     R3
39 .text:757DA0EC 00 70 A0 E1 MOV     R7, R0
40 .text:757DA0F0 00 20 94 E5 LDR     R2, [R4]
41 .text:757DA0F4 00 60 8D E5 STR     R6, [SP,#0x28+var_28]
42 .text:757DA0F8 05 30 A0 E1 MOV     R3, R5
43 .text:757DA0FC 40 C3 92 E5 LDR     R12, [R2,#0x340]
44 .text:757DA100 04 00 A0 E1 MOV     R0, R4
45 .text:757DA104 07 10 A0 E1 MOV     R1, R7
46 .text:757DA108 00 20 A0 E3 MOV     R2, #0
47 .text:757DA10C 3C FF 2F E1 BLX     R12
48 .text:757DA110 06 00 A0 E1 MOV     R0, R6                          ; ptr
49 .text:757DA114 DD F6 FF EB BL      free
50 .text:757DA118 07 00 A0 E1 MOV     R0, R7
51 .text:757DA11C 0C D0 8D E2 ADD     SP, SP, #0xC
52 .text:757DA120 F0 83 BD E8 LDMFD   SP!, {R4-R9,PC}
53 解密完后R5是大小,R6基址,将其dump出来,如下图所示:
 1 static main(void)
 2     {
 3         auto fp, begin, end, dexbyte;
 4         fp = fopen("d:\\libstub.so", "wb"); //打开或创建一个文件
 5         begin =  R6;              //so基址
 6         end = begin + R5;            //so基址 + so文件大小
 7         for ( dexbyte = begin; dexbyte < end;dexbyte ++ )
 8         {
 9             fputc(Byte(dexbyte), fp);     //按字节将其dump到本地文件中
10         }
11     } 

libstub.sox解密后将最终的明文写到/data/data/包名/files/libstub.so目录下,后然加载,接下来分析libstub.so。

四: stub.so反调试与反反调试

1.反调试在JNI_onLoad中读取进程状态,前面通过hook open函数己过了反调试。

五: stub.so注册jni函数分析

1.注册jni

通过在dvmUseJNIBridge函数下好断点,来获取注册的jni函数地址,最后注册完后对照表:

注册类名com/inca/security/Core/UnsafeDexLoader

/data/data/com.digitalsky.girlsfrontline.cn/files/libstub.so  75C6E000   00052000

Number     内存地址 函数名       文件偏移   签名  

第1个函数   .text:75C80704  IlIIIIIIII (文件偏移 12704)  (Ljava/lang/String;Ljava/lang/String;I)I

第2个函数   .text:75C808C4  IIIIIIIIIl (文件偏移 128C4)  ([B)I

第3个函数   .text:75C80A7C  IIIIIIIIlI (文件偏移 12A7C)  (Ljava/lang/String;Ljava/lang/ClassLoader;I)Ljava/lang/Class;

第4个函数   .text:75C80C3C  IIIIIIIIll (文件偏移 12C3C)  (I)[Ljava/lang/String;

第5个函数   .text:75C80DF4  IIIIIIIlII (文件偏移 12DF4)  (I)V

//

注册类名com/inca/security/Core/AppGuardEngine

/data/data/com.digitalsky.girlsfrontline.cn/files/libstub.so  75C6E000   00052000

Number     内存地址 函数名       文件偏移   签名  

第1个函数   .text:75C81168  IlIIIIIIII (文件偏移 13168)  (Landroid/content/Context;Ljava/lang/String;[B)I

第2个函数   .text:75C814AC  IIIIIIIllI (文件偏移 134AC)  ()V

第3个函数   .text:75C81618  IIIIIIIlll (文件偏移 13618)  (I[B[B)I

第4个函数   .text:75C81724  IIIIIIlIII (文件偏移 13724)  (I[B[B)I

第5个函数   .text:75C817CC  IIIIIIIlII (文件偏移 137CC)  (I[B[B)I

第6个函数   .text:75C8186C  IllIIIlIII (文件偏移 1386C)  (I)I

第7个函数   .text:75C818AC  IIIIIIlIlI (文件偏移 138AC)  (I)I

第8个函数   .text:75C81810  llIIIIlIIl (文件偏移 13810)  (I[B)I

第9个函数   .text:75C81844  IlIIIIlllI (文件偏移 13844)  (Z)V

第10个函数   .text:75C81D10  lllIIIlllI (文件偏移 13D10) (Landroid/content/Context;)V

注册类名com/inca/security/AppGuard/TestCase

/data/data/com.digitalsky.girlsfrontline.cn/files/libstub.so  75C6E000   00052000

第1个函数   .text:75C82608  IIIIIIlIll (文件偏移 14608)  (Landroid/content/Context;Z)Z

第2个函数   .text:75C8267C  IIIIIIllII (文件偏移 1467C)  (Landroid/content/Context;)Z

第3个函数   .text:75C826F0  IIIIIIllIl (文件偏移 146F0)  (Landroid/content/Context;)Z

第4个函数   .text:75C82764  IIIIIIlllI (文件偏移 14764)  (Landroid/content/Context;)Z

2.在com/inca/security/Core/AppGuardEngine类中第10个函数jni函数中hook mono函数 (文件偏移 18D04)

  1 /data/data/com.digitalsky.girlsfrontline.cn/files/libstub.so    75C6E000    00052000
  2 
  3 .text:75C86D04             EXPORT hook_mono_func
  4 .text:75C86D04             hook_mono_func                          ; CODE XREF: Hook_Thread+4↑p
  5 .text:75C86D04
  6 .text:75C86D04             var_280= -0x280
  7 .text:75C86D04             var_27C= -0x27C
  8 .text:75C86D04             var_278= -0x278
  9 .text:75C86D04             format= -0x274
 10 .text:75C86D04             var_26C= -0x26C
 11 .text:75C86D04             var_24C= -0x24C
 12 .text:75C86D04             s= -0x22C
 13 .text:75C86D04             var_12C= -0x12C
 14 .text:75C86D04             var_2C= -0x2C
 15 .text:75C86D04
 16 .text:75C86D04             ; __unwind { // 75C9B220
 17 .text:75C86D04 F0 4F 2D E9 STMFD   SP!, {R4-R11,LR}
 18 .text:75C86D08 08 56 9F E5 LDR     R5, =(_GLOBAL_OFFSET_TABLE_ - 0x75C86D1C)
 19 .text:75C86D0C 08 36 9F E5 LDR     R3, =(__stack_chk_guard_ptr - 0x75CBEEC0)
 20 .text:75C86D10 97 DF 4D E2 SUB     SP, SP, #0x25C
 21 .text:75C86D14 05 50 8F E0 ADD     R5, PC, R5                      ; _GLOBAL_OFFSET_TABLE_
 22 .text:75C86D18 03 A0 95 E7 LDR     R10, [R5,R3]
 23 .text:75C86D1C 54 80 8D E2 ADD     R8, SP, #0x280+s
 24 .text:75C86D20 00 10 A0 E3 MOV     R1, #0                          ; c
 25 .text:75C86D24 00 30 9A E5 LDR     R3, [R10]
 26 .text:75C86D28 FF 20 A0 E3 MOV     R2, #0xFF                       ; n
 27 .text:75C86D2C 08 00 A0 E1 MOV     R0, R8                          ; s
 28 .text:75C86D30 54 32 8D E5 STR     R3, [SP,#0x280+var_2C]
 29 .text:75C86D34 29 D7 FF EB BL      memset
 30 .text:75C86D38 E0 15 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86D4C)
 31 .text:75C86D3C 34 40 8D E2 ADD     R4, SP, #0x280+var_24C
 32 .text:75C86D40 04 00 A0 E1 MOV     R0, R4                          ; this
 33 .text:75C86D44 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
 34 .text:75C86D48 F0 10 81 E2 ADD     R1, R1, #0xF0                   ; char *
 35 .text:75C86D4C 83 F8 FF EB BL      DecString
 36 .text:75C86D50 04 00 A0 E1 MOV     R0, R4
 37 .text:75C86D54 67 F7 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
 38 .text:75C86D58 00 10 A0 E3 MOV     R1, #0                          ; mode
 39 .text:75C86D5C 13 D7 FF EB BL      dlopen
 40 .text:75C86D60 00 60 A0 E1 MOV     R6, R0
 41 .text:75C86D64 04 00 A0 E1 MOV     R0, R4                          ; this
 42 .text:75C86D68 40 F7 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
 43 .text:75C86D6C B0 15 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86D80)
 44 .text:75C86D70 00 00 56 E3 CMP     R6, #0
 45 .text:75C86D74 04 00 A0 E1 MOV     R0, R4                          ; this
 46 .text:75C86D78 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
 47 .text:75C86D7C 05 1D 81 E2 ADD     R1, R1, #0x140                  ; char *
 48 .text:75C86D80 00 60 E0 03 MOVEQ   R6, #0xFFFFFFFF
 49 .text:75C86D84 75 F8 FF EB BL      DecString
 50 .text:75C86D88 04 00 A0 E1 MOV     R0, R4
 51 .text:75C86D8C 59 F7 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
 52 .text:75C86D90 00 10 A0 E1 MOV     R1, R0                          ; name
 53 .text:75C86D94 06 00 A0 E1 MOV     R0, R6                          ; handle
 54 .text:75C86D98 F8 D6 FF EB BL      dlsym
 55 .text:75C86D9C 00 60 A0 E1 MOV     R6, R0
 56 .text:75C86DA0 04 00 A0 E1 MOV     R0, R4                          ; this
 57 .text:75C86DA4 31 F7 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
 58 .text:75C86DA8 00 00 56 E3 CMP     R6, #0
 59 .text:75C86DAC 01 00 00 0A BEQ     loc_75C86DB8
 60 .text:75C86DB0 36 FF 2F E1 BLX     R6
 61 .text:75C86DB4 00 60 A0 E1 MOV     R6, R0
 62 .text:75C86DB8
 63 .text:75C86DB8             loc_75C86DB8                            ; CODE XREF: hook_mono_func+A8↑j
 64 .text:75C86DB8 06 00 A0 E1 MOV     R0, R6                          ; unsigned int
 65 .text:75C86DBC 58 09 00 EB BL      _Z11llllIIlllIlj                ; libil2cpp.so没有
 66 .text:75C86DC0 60 15 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86DD4)
 67 .text:75C86DC4 14 70 8D E2 ADD     R7, SP, #0x280+var_26C
 68 .text:75C86DC8 07 00 A0 E1 MOV     R0, R7                          ; this
 69 .text:75C86DCC 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
 70 .text:75C86DD0 19 1E 81 E2 ADD     R1, R1, #0x190                  ; char *
 71 .text:75C86DD4 61 F8 FF EB BL      DecString
 72 .text:75C86DD8 07 00 A0 E1 MOV     R0, R7
 73 .text:75C86DDC 45 F7 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
 74 .text:75C86DE0 44 15 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86DF0)
 75 .text:75C86DE4 00 90 A0 E1 MOV     R9, R0
 76 .text:75C86DE8 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
 77 .text:75C86DEC 04 00 A0 E1 MOV     R0, R4                          ; this
 78 .text:75C86DF0 1E 1E 81 E2 ADD     R1, R1, #0x1E0                  ; char *
 79 .text:75C86DF4 59 F8 FF EB BL      DecString
 80 .text:75C86DF8 04 00 A0 E1 MOV     R0, R4
 81 .text:75C86DFC 3D F7 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
 82 .text:75C86E00 28 25 9F E5 LDR     R2, =(_ZN6Global10llIllllIlIE_ptr - 0x75CBEEC0)
 83 .text:75C86E04 00 30 A0 E1 MOV     R3, R0
 84 .text:75C86E08 02 20 95 E7 LDR     R2, [R5,R2]
 85 .text:75C86E0C 09 10 A0 E1 MOV     R1, R9                          ; format
 86 .text:75C86E10 08 00 A0 E1 MOV     R0, R8                          ; s
 87 .text:75C86E14 00 20 8D E5 STR     R2, [SP,#0x280+var_280]
 88 .text:75C86E18 F9 D6 FF EB BL      sprintf
 89 .text:75C86E1C 04 00 A0 E1 MOV     R0, R4                          ; this
 90 .text:75C86E20 12 F7 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
 91 .text:75C86E24 07 00 A0 E1 MOV     R0, R7                          ; this
 92 .text:75C86E28 10 F7 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
 93 .text:75C86E2C 08 00 A0 E1 MOV     R0, R8                          ; file
 94 .text:75C86E30 00 10 A0 E3 MOV     R1, #0                          ; mode
 95 .text:75C86E34 DD D6 FF EB BL      dlopen                          ; 打开libmono.so
 96 .text:75C86E38 00 90 50 E2 SUBS    R9, R0, #0
 97 .text:75C86E3C 5B 00 00 0A BEQ     loc_75C86FB0
 98 .text:75C86E40 EC 14 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86E50)
 99 .text:75C86E44 04 00 A0 E1 MOV     R0, R4                          ; this
100 .text:75C86E48 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
101 .text:75C86E4C 23 1E 81 E2 ADD     R1, R1, #0x230                  ; char *
102 .text:75C86E50 42 F8 FF EB BL      DecString
103 .text:75C86E54 04 00 A0 E1 MOV     R0, R4
104 .text:75C86E58 26 F7 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
105 .text:75C86E5C 00 10 A0 E1 MOV     R1, R0                          ; name
106 .text:75C86E60 09 00 A0 E1 MOV     R0, R9                          ; handle
107 .text:75C86E64 C5 D6 FF EB BL      dlsym                           ; 获取mono_assembly_load_from_full地址
108 .text:75C86E68 C8 34 9F E5 LDR     R3, =(IIlIlIIllll_ptr - 0x75CBEEC0)
109 .text:75C86E6C C8 24 9F E5 LDR     R2, =(dword_75CC0068 - 0x75C86E7C)
110 .text:75C86E70 03 30 95 E7 LDR     R3, [R5,R3]
111 .text:75C86E74 02 20 8F E0 ADD     R2, PC, R2                      ; dword_75CC0068
112 .text:75C86E78 10 20 82 E2 ADD     R2, R2, #0x10                   ; void **
113 .text:75C86E7C 03 10 A0 E1 MOV     R1, R3                          ; void *
114 .text:75C86E80 08 30 8D E5 STR     R3, [SP,#0x280+var_278]
115 .text:75C86E84 75 F8 FF EB BL      hook                            ; hook mono_assembly_load_from_full
116 .text:75C86E88 04 00 A0 E1 MOV     R0, R4                          ; this
117 .text:75C86E8C F7 F6 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
118 .text:75C86E90 A8 14 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86EA0)
119 .text:75C86E94 04 00 A0 E1 MOV     R0, R4                          ; this
120 .text:75C86E98 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
121 .text:75C86E9C 0A 1D 81 E2 ADD     R1, R1, #0x280                  ; char *
122 .text:75C86EA0 2E F8 FF EB BL      DecString
123 .text:75C86EA4 04 00 A0 E1 MOV     R0, R4
124 .text:75C86EA8 12 F7 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
125 .text:75C86EAC 00 10 A0 E1 MOV     R1, R0                          ; name
126 .text:75C86EB0 09 00 A0 E1 MOV     R0, R9                          ; handle
127 .text:75C86EB4 B1 D6 FF EB BL      dlsym                           ; 获取mono_image_open_from_data_with_name地址
128 .text:75C86EB8 84 34 9F E5 LDR     R3, =(lIlIllIllIl_ptr - 0x75CBEEC0)
129 .text:75C86EBC 84 24 9F E5 LDR     R2, =(dword_75CC0068 - 0x75C86ECC)
130 .text:75C86EC0 03 30 95 E7 LDR     R3, [R5,R3]
131 .text:75C86EC4 02 20 8F E0 ADD     R2, PC, R2                      ; dword_75CC0068
132 .text:75C86EC8 08 20 82 E2 ADD     R2, R2, #8                      ; void **
133 .text:75C86ECC 03 10 A0 E1 MOV     R1, R3                          ; void *
134 .text:75C86ED0 04 30 8D E5 STR     R3, [SP,#0x280+var_27C]
135 .text:75C86ED4 61 F8 FF EB BL      hook                            ; hook mono_image_open_from_data_with_name
136 .text:75C86ED8 04 00 A0 E1 MOV     R0, R4                          ; this
137 .text:75C86EDC E3 F6 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
138 .text:75C86EE0 64 34 9F E5 LDR     R3, =(dword_75CC0068 - 0x75C86EEC)
139 .text:75C86EE4 03 30 8F E0 ADD     R3, PC, R3                      ; dword_75CC0068
140 .text:75C86EE8 10 20 93 E5 LDR     R2, [R3,#(dword_75CC0078 - 0x75CC0068)]
141 .text:75C86EEC 00 00 52 E3 CMP     R2, #0
142 .text:75C86EF0 34 00 00 0A BEQ     loc_75C86FC8
143 .text:75C86EF4 08 30 93 E5 LDR     R3, [R3,#(dword_75CC0070 - 0x75CC0068)]
144 .text:75C86EF8 00 00 53 E3 CMP     R3, #0
145 .text:75C86EFC 31 00 00 0A BEQ     loc_75C86FC8
146 .text:75C86F00
147 .text:75C86F00             loc_75C86F00                            ; CODE XREF: hook_mono_func+364↓j
148 .text:75C86F00                                                     ; hook_mono_func+38C↓j ...
149 .text:75C86F00 17 00 56 E3 CMP     R6, #0x17
150 .text:75C86F04 04 00 00 9A BLS     loc_75C86F1C
151 .text:75C86F08 40 34 9F E5 LDR     R3, =(_ZN6Global10lIlllIIllIE_ptr - 0x75CBEEC0)
152 .text:75C86F0C 03 30 95 E7 LDR     R3, [R5,R3]
153 .text:75C86F10 00 30 93 E5 LDR     R3, [R3]                        ; Global::lIlllIIllI
154 .text:75C86F14 17 00 53 E3 CMP     R3, #0x17
155 .text:75C86F18 6E 00 00 CA BGT     loc_75C870D8
156 .text:75C86F1C
157 .text:75C86F1C             loc_75C86F1C                            ; CODE XREF: hook_mono_func+200↑j
158 .text:75C86F1C 30 14 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86F2C)
159 .text:75C86F20 04 00 A0 E1 MOV     R0, R4                          ; this
160 .text:75C86F24 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
161 .text:75C86F28 32 1E 81 E2 ADD     R1, R1, #0x320                  ; char *
162 .text:75C86F2C 0B F8 FF EB BL      DecString
163 .text:75C86F30 04 00 A0 E1 MOV     R0, R4
164 .text:75C86F34 EF F6 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
165 .text:75C86F38 18 34 9F E5 LDR     R3, =(dword_75CC0068 - 0x75C86F4C)
166 .text:75C86F3C 18 24 9F E5 LDR     R2, =(lIIIlIIlII_ptr - 0x75CBEEC0)
167 .text:75C86F40 00 10 A0 E1 MOV     R1, R0                          ; char *
168 .text:75C86F44 03 30 8F E0 ADD     R3, PC, R3                      ; dword_75CC0068
169 .text:75C86F48 02 20 95 E7 LDR     R2, [R5,R2]                     ; void *
170 .text:75C86F4C 04 30 83 E2 ADD     R3, R3, #4                      ; void **
171 .text:75C86F50 09 00 A0 E1 MOV     R0, R9                          ; void *
172 .text:75C86F54 99 F8 FF EB BL      IAT_HOOK                        ; hook memcpy
173 .text:75C86F58 04 00 A0 E1 MOV     R0, R4                          ; this
174 .text:75C86F5C C3 F6 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
175 .text:75C86F60 F8 13 9F E5 LDR     R1, =(unk_75CB8B70 - 0x75C86F70)
176 .text:75C86F64 04 00 A0 E1 MOV     R0, R4                          ; this
177 .text:75C86F68 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CB8B70
178 .text:75C86F6C 37 1E 81 E2 ADD     R1, R1, #0x370                  ; char *
179 .text:75C86F70 FA F7 FF EB BL      DecString
180 .text:75C86F74 04 00 A0 E1 MOV     R0, R4
181 .text:75C86F78 DE F6 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
182 .text:75C86F7C E0 33 9F E5 LDR     R3, =(IlIIIlIIlI_ptr - 0x75CBEEC0)
183 .text:75C86F80 00 10 A0 E1 MOV     R1, R0                          ; char *
184 .text:75C86F84 03 20 95 E7 LDR     R2, [R5,R3]                     ; void *
185 .text:75C86F88 D8 33 9F E5 LDR     R3, =(dword_75CC0068 - 0x75C86F98)
186 .text:75C86F8C 09 00 A0 E1 MOV     R0, R9                          ; void *
187 .text:75C86F90 03 30 8F E0 ADD     R3, PC, R3                      ; dword_75CC0068 ; void **
188 .text:75C86F94 89 F8 FF EB BL      IAT_HOOK                        ; hook mmap
189 .text:75C86F98
190 .text:75C86F98             loc_75C86F98                            ; CODE XREF: hook_mono_func+4C0↓j
191 .text:75C86F98 04 00 A0 E1 MOV     R0, R4                          ; this
192 .text:75C86F9C B3 F6 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
193 .text:75C86FA0
194 .text:75C86FA0             loc_75C86FA0                            ; CODE XREF: hook_mono_func+484↓j
195 .text:75C86FA0 01 20 A0 E3 MOV     R2, #1
196 .text:75C86FA4 C0 33 9F E5 LDR     R3, =(_ZN6Global10lllllllIIIE_ptr - 0x75CBEEC0)
197 .text:75C86FA8 03 30 95 E7 LDR     R3, [R5,R3]
198 .text:75C86FAC 00 20 C3 E5 STRB    R2, [R3]                        ; Global::lllllllIII
199 .text:75C86FB0
200 .text:75C86FB0             loc_75C86FB0                            ; CODE XREF: hook_mono_func+138↑j
201 .text:75C86FB0 54 22 9D E5 LDR     R2, [SP,#0x280+var_2C]
202 .text:75C86FB4 00 30 9A E5 LDR     R3, [R10]
203 .text:75C86FB8 03 00 52 E1 CMP     R2, R3
204 .text:75C86FBC A4 00 00 1A BNE     loc_75C87254
205 .text:75C86FC0 97 DF 8D E2 ADD     SP, SP, #0x25C
206 .text:75C86FC4 F0 8F BD E8 LDMFD   SP!, {R4-R11,PC}

六: Assembly-CSharp.dll解密分析

1. 在mono的hook函数中解密Assembly-CSharp.dll,代码如下:

  1 .text:75C7A138             EXPORT hook_mono_image_open_from_data_with_name
  2 .text:75C7A138             hook_mono_image_open_from_data_with_name
  3 .text:75C7A138                                                     ; DATA XREF: .got:lIlIllIllIl_ptr↓o
  4 .text:75C7A138
  5 .text:75C7A138             var_4F0= -0x4F0
  6 .text:75C7A138             var_4EC= -0x4EC
  7 .text:75C7A138             var_4E8= -0x4E8
  8 .text:75C7A138             var_4E4= -0x4E4
  9 .text:75C7A138             var_4DC= -0x4DC
 10 .text:75C7A138             var_4D8= -0x4D8
 11 .text:75C7A138             var_4D4= -0x4D4
 12 .text:75C7A138             var_4D0= -0x4D0
 13 .text:75C7A138             var_4CC= -0x4CC
 14 .text:75C7A138             var_4C8= -0x4C8
 15 .text:75C7A138             var_4C4= -0x4C4
 16 .text:75C7A138             var_60= -0x60
 17 .text:75C7A138             var_54= -0x54
 18 .text:75C7A138             var_50= -0x50
 19 .text:75C7A138             var_4C= -0x4C
 20 .text:75C7A138             var_48= -0x48
 21 .text:75C7A138             var_44= -0x44
 22 .text:75C7A138             var_43= -0x43
 23 .text:75C7A138             var_42= -0x42
 24 .text:75C7A138             var_41= -0x41
 25 .text:75C7A138             var_40= -0x40
 26 .text:75C7A138             var_3F= -0x3F
 27 .text:75C7A138             var_3E= -0x3E
 28 .text:75C7A138             var_3D= -0x3D
 29 .text:75C7A138             var_2C= -0x2C
 30 .text:75C7A138             arg_0=  0
 31 .text:75C7A138             arg_4=  4
 32 .text:75C7A138
 33 .text:75C7A138             ; __unwind { // 75C8F220
 34 .text:75C7A138 F0 4F 2D E9 STMFD   SP!, {R4-R11,LR}
 35 .text:75C7A13C 13 DD 4D E2 SUB     SP, SP, #0x4C0
 36 .text:75C7A140 0C D0 4D E2 SUB     SP, SP, #0xC
 37 .text:75C7A144 F4 74 9D E5 LDR     R7, [SP,#0x4F0+arg_4]
 38 .text:75C7A148 54 84 9F E5 LDR     R8, =(_GLOBAL_OFFSET_TABLE_ - 0x75C7A168)
 39 .text:75C7A14C 54 C4 9F E5 LDR     R12, =(__stack_chk_guard_ptr - 0x75CB2EC0)
 40 .text:75C7A150 00 60 97 E2 MOVS    R6, R7
 41 .text:75C7A154 01 60 A0 13 MOVNE   R6, #1
 42 .text:75C7A158 00 00 57 E3 CMP     R7, #0
 43 .text:75C7A15C FF 00 51 13 CMPNE   R1, #0xFF
 44 .text:75C7A160 08 80 8F E0 ADD     R8, PC, R8                      ; _GLOBAL_OFFSET_TABLE_
 45 .text:75C7A164 0C C0 98 E7 LDR     R12, [R8,R12]
 46 .text:75C7A168 01 50 A0 E1 MOV     R5, R1
 47 .text:75C7A16C 08 C0 8D E5 STR     R12, [SP,#0x4F0+var_4E8]
 48 .text:75C7A170 00 C0 9C E5 LDR     R12, [R12]
 49 .text:75C7A174 00 40 A0 E1 MOV     R4, R0
 50 .text:75C7A178 0C 20 8D E5 STR     R2, [SP,#0x4F0+var_4E4]
 51 .text:75C7A17C C4 C4 8D E5 STR     R12, [SP,#0x4F0+var_2C]
 52 .text:75C7A180 DE 00 00 9A BLS     loc_75C7A500
 53 .text:75C7A184 20 14 9F E5 LDR     R1, =(unk_75CACB70 - 0x75C7A198)
 54 .text:75C7A188 2C 60 8D E2 ADD     R6, SP, #0x4F0+var_4C4
 55 .text:75C7A18C 06 00 A0 E1 MOV     R0, R6                          ; this
 56 .text:75C7A190 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CACB70 ; char *
 57 .text:75C7A194 03 90 A0 E1 MOV     R9, R3
 58 .text:75C7A198 70 FB FF EB BL      DecString
 59 .text:75C7A19C 06 00 A0 E1 MOV     R0, R6
 60 .text:75C7A1A0 54 FA FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
 61 .text:75C7A1A4 00 10 A0 E1 MOV     R1, R0                          ; needle
 62 .text:75C7A1A8 07 00 A0 E1 MOV     R0, R7                          ; haystack
 63 .text:75C7A1AC 29 DA FF EB BL      strstr                          ; 判断是否加载Assembly-CSharp.dll
 64 .text:75C7A1B0 00 A0 A0 E1 MOV     R10, R0
 65 .text:75C7A1B4 06 00 A0 E1 MOV     R0, R6                          ; this
 66 .text:75C7A1B8 2C FA FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
 67 .text:75C7A1BC 00 00 5A E3 CMP     R10, #0
 68 .text:75C7A1C0 A5 00 00 0A BEQ     loc_75C7A45C
 69 .text:75C7A1C4 E4 A3 9F E5 LDR     R10, =unk_49F54EEB              ; 准备解密
 70 .text:75C7A1C8 E4 E3 9F E5 LDR     LR, =0x8B3BE89F
 71 .text:75C7A1CC E4 C3 9F E5 LDR     R12, =0xC6EF3720
 72 .text:75C7A1D0 0A 30 A0 E1 MOV     R3, R10
 73 .text:75C7A1D4
 74 .text:75C7A1D4             loc_75C7A1D4                            ; CODE XREF: hook_mono_image_open_from_data_with_name+104↓j
 75 .text:75C7A1D4 E0 13 9F E5 LDR     R1, =0x815AA0CD
 76 .text:75C7A1D8 E0 23 9F E5 LDR     R2, =0xA1C489F7
 77 .text:75C7A1DC 03 B2 A0 E1 MOV     R11, R3,LSL#4
 78 .text:75C7A1E0 A3 02 A0 E1 MOV     R0, R3,LSR#5
 79 .text:75C7A1E4 01 10 8B E0 ADD     R1, R11, R1
 80 .text:75C7A1E8 02 20 80 E0 ADD     R2, R0, R2
 81 .text:75C7A1EC 03 30 8C E0 ADD     R3, R12, R3
 82 .text:75C7A1F0 01 20 22 E0 EOR     R2, R2, R1
 83 .text:75C7A1F4 03 20 22 E0 EOR     R2, R2, R3
 84 .text:75C7A1F8 C4 13 9F E5 LDR     R1, =0x95A8882C
 85 .text:75C7A1FC C4 33 9F E5 LDR     R3, =0x9D2CC113
 86 .text:75C7A200 0E E0 62 E0 RSB     LR, R2, LR
 87 .text:75C7A204 0C 20 8E E0 ADD     R2, LR, R12
 88 .text:75C7A208 0E B2 A0 E1 MOV     R11, LR,LSL#4
 89 .text:75C7A20C AE 02 A0 E1 MOV     R0, LR,LSR#5
 90 .text:75C7A210 61 C4 8C E2 ADD     R12, R12, #0x61000000
 91 .text:75C7A214 01 10 8B E0 ADD     R1, R11, R1
 92 .text:75C7A218 03 30 80 E0 ADD     R3, R0, R3
 93 .text:75C7A21C 32 C7 8C E2 ADD     R12, R12, #0xC80000
 94 .text:75C7A220 01 30 23 E0 EOR     R3, R3, R1
 95 .text:75C7A224 86 CC 8C E2 ADD     R12, R12, #0x8600
 96 .text:75C7A228 02 30 23 E0 EOR     R3, R3, R2
 97 .text:75C7A22C 47 C0 8C E2 ADD     R12, R12, #0x47
 98 .text:75C7A230 0A 30 63 E0 RSB     R3, R3, R10
 99 .text:75C7A234 00 00 5C E3 CMP     R12, #0
100 .text:75C7A238 03 A0 A0 E1 MOV     R10, R3
101 .text:75C7A23C E4 FF FF 1A BNE     loc_75C7A1D4
102 .text:75C7A240 00 10 D4 E5 LDRB    R1, [R4]
103 .text:75C7A244 FF 20 03 E2 AND     R2, R3, #0xFF
104 .text:75C7A248 28 E0 8D E5 STR     LR, [SP,#0x4F0+var_4C8]
105 .text:75C7A24C 02 00 51 E1 CMP     R1, R2
106 .text:75C7A250 24 30 8D E5 STR     R3, [SP,#0x4F0+var_4CC]
107 .text:75C7A254 80 00 00 1A BNE     loc_75C7A45C
108 .text:75C7A258 01 20 D4 E5 LDRB    R2, [R4,#1]
109 .text:75C7A25C 25 30 DD E5 LDRB    R3, [SP,#0x4F0+var_4CC+1]
110 .text:75C7A260 03 00 52 E1 CMP     R2, R3
111 .text:75C7A264 7C 00 00 1A BNE     loc_75C7A45C
112 .text:75C7A268 02 20 D4 E5 LDRB    R2, [R4,#2]
113 .text:75C7A26C 26 30 DD E5 LDRB    R3, [SP,#0x4F0+var_4CC+2]
114 .text:75C7A270 03 00 52 E1 CMP     R2, R3
115 .text:75C7A274 78 00 00 1A BNE     loc_75C7A45C
116 .text:75C7A278 03 20 D4 E5 LDRB    R2, [R4,#3]
117 .text:75C7A27C 27 30 DD E5 LDRB    R3, [SP,#0x4F0+var_4CC+3]
118 .text:75C7A280 03 00 52 E1 CMP     R2, R3
119 .text:75C7A284 74 00 00 1A BNE     loc_75C7A45C
120 .text:75C7A288 04 20 D4 E5 LDRB    R2, [R4,#4]
121 .text:75C7A28C 28 30 DD E5 LDRB    R3, [SP,#0x4F0+var_4C8]
122 .text:75C7A290 03 00 52 E1 CMP     R2, R3
123 .text:75C7A294 70 00 00 1A BNE     loc_75C7A45C
124 .text:75C7A298 2C 33 9F E5 LDR     R3, =(_ZN6Global10IIlllllllIE_ptr - 0x75CB2EC0)
125 .text:75C7A29C 9C C4 8D E5 STR     R12, [SP,#0x4F0+var_54]
126 .text:75C7A2A0 A0 C4 8D E5 STR     R12, [SP,#0x4F0+var_50]
127 .text:75C7A2A4 03 30 98 E7 LDR     R3, [R8,R3]
128 .text:75C7A2A8 00 30 D3 E5 LDRB    R3, [R3]                        ; Global::IIlllllllI
129 .text:75C7A2AC 00 00 53 E3 CMP     R3, #0
130 .text:75C7A2B0 A7 00 00 0A BEQ     loc_75C7A554
131 .text:75C7A2B4 14 33 9F E5 LDR     R3, =(_ZN6Global10IllIlIIllIE_ptr - 0x75CB2EC0)
132 .text:75C7A2B8 03 30 98 E7 LDR     R3, [R8,R3]
133 .text:75C7A2BC 00 30 93 E5 LDR     R3, [R3]                        ; Global::IllIlIIllI
134 .text:75C7A2C0 00 A0 D3 E5 LDRB    R10, [R3]
135 .text:75C7A2C4 01 80 D3 E5 LDRB    R8, [R3,#1]
136 .text:75C7A2C8 02 E0 D3 E5 LDRB    LR, [R3,#2]
137 .text:75C7A2CC 03 C0 D3 E5 LDRB    R12, [R3,#3]
138 .text:75C7A2D0 04 00 D3 E5 LDRB    R0, [R3,#4]
139 .text:75C7A2D4 05 10 D3 E5 LDRB    R1, [R3,#5]
140 .text:75C7A2D8 06 20 D3 E5 LDRB    R2, [R3,#6]
141 .text:75C7A2DC 07 30 D3 E5 LDRB    R3, [R3,#7]
142 .text:75C7A2E0 9C A4 CD E5 STRB    R10, [SP,#0x4F0+var_54]
143 .text:75C7A2E4 9D 84 CD E5 STRB    R8, [SP,#0x4F0+var_54+1]
144 .text:75C7A2E8 9E E4 CD E5 STRB    LR, [SP,#0x4F0+var_54+2]
145 .text:75C7A2EC 9F C4 CD E5 STRB    R12, [SP,#0x4F0+var_54+3]
146 .text:75C7A2F0 A0 04 CD E5 STRB    R0, [SP,#0x4F0+var_50]
147 .text:75C7A2F4 A1 14 CD E5 STRB    R1, [SP,#0x4F0+var_50+1]
148 .text:75C7A2F8 A2 24 CD E5 STRB    R2, [SP,#0x4F0+var_50+2]
149 .text:75C7A2FC A3 34 CD E5 STRB    R3, [SP,#0x4F0+var_50+3]
150 .text:75C7A300
151 .text:75C7A300             loc_75C7A300                            ; CODE XREF: hook_mono_image_open_from_data_with_name+440↓j
152 .text:75C7A300 06 00 A0 E1 MOV     R0, R6                          ; this
153 .text:75C7A304 2E F1 FF EB BL      _ZN10llIlIlIlllC2Ev             ; llIlIlIlll::llIlIlIlll(void)
154 .text:75C7A308 10 30 A0 E3 MOV     R3, #0x10                       ; int
155 .text:75C7A30C 05 C0 D4 E5 LDRB    R12, [R4,#5]
156 .text:75C7A310 9C E4 9D E5 LDR     LR, [SP,#0x4F0+var_54]
157 .text:75C7A314 08 10 D4 E5 LDRB    R1, [R4,#8]
158 .text:75C7A318 09 20 D4 E5 LDRB    R2, [R4,#9]
159 .text:75C7A31C 07 00 D4 E5 LDRB    R0, [R4,#7]
160 .text:75C7A320 06 A0 D4 E5 LDRB    R10, [R4,#6]
161 .text:75C7A324 00 30 8D E5 STR     R3, [SP,#0x4F0+var_4F0]         ; int
162 .text:75C7A328 A0 B4 9D E5 LDR     R11, [SP,#0x4F0+var_50]
163 .text:75C7A32C A4 E4 8D E5 STR     LR, [SP,#0x4F0+var_4C]
164 .text:75C7A330 0A 80 D4 E5 LDRB    R8, [R4,#0xA]
165 .text:75C7A334 0B E0 D4 E5 LDRB    LR, [R4,#0xB]
166 .text:75C7A338 AC C4 CD E5 STRB    R12, [SP,#0x4F0+var_44]
167 .text:75C7A33C 0C C0 D4 E5 LDRB    R12, [R4,#0xC]
168 .text:75C7A340 AF 14 CD E5 STRB    R1, [SP,#0x4F0+var_41]
169 .text:75C7A344 B0 24 CD E5 STRB    R2, [SP,#0x4F0+var_40]
170 .text:75C7A348 4A 1E 8D E2 ADD     R1, SP, #0x4F0+var_50
171 .text:75C7A34C 4B 2E 8D E2 ADD     R2, SP, #0x4F0+var_40
172 .text:75C7A350 AE 04 CD E5 STRB    R0, [SP,#0x4F0+var_42]
173 .text:75C7A354 04 10 81 E2 ADD     R1, R1, #4                      ; char *
174 .text:75C7A358 06 00 A0 E1 MOV     R0, R6                          ; this
175 .text:75C7A35C 04 20 82 E2 ADD     R2, R2, #4                      ; char *
176 .text:75C7A360 A8 B4 8D E5 STR     R11, [SP,#0x4F0+var_48]
177 .text:75C7A364 AD A4 CD E5 STRB    R10, [SP,#0x4F0+var_43]
178 .text:75C7A368 B1 84 CD E5 STRB    R8, [SP,#0x4F0+var_3F]
179 .text:75C7A36C B2 E4 CD E5 STRB    LR, [SP,#0x4F0+var_3E]
180 .text:75C7A370 B3 C4 CD E5 STRB    R12, [SP,#0x4F0+var_3D]
181 .text:75C7A374 16 F1 FF EB BL      _ZN10llIlIlIlll10lIIIIlIlIIEPKcS1_ii ; llIlIlIlll::lIIIIlIlII(char const*,char const*,int,int)
182 .text:75C7A378 0F 20 D4 E5 LDRB    R2, [R4,#0xF]
183 .text:75C7A37C 10 30 D4 E5 LDRB    R3, [R4,#0x10]
184 .text:75C7A380 0D 00 D4 E5 LDRB    R0, [R4,#0xD]
185 .text:75C7A384 0E 10 D4 E5 LDRB    R1, [R4,#0xE]
186 .text:75C7A388 16 20 CD E5 STRB    R2, [SP,#0x4F0+var_4DC+2]
187 .text:75C7A38C 17 30 CD E5 STRB    R3, [SP,#0x4F0+var_4DC+3]
188 .text:75C7A390 11 20 D4 E5 LDRB    R2, [R4,#0x11]
189 .text:75C7A394 12 30 D4 E5 LDRB    R3, [R4,#0x12]
190 .text:75C7A398 14 00 CD E5 STRB    R0, [SP,#0x4F0+var_4DC]
191 .text:75C7A39C 15 10 CD E5 STRB    R1, [SP,#0x4F0+var_4DC+1]
192 .text:75C7A3A0 14 A0 9D E5 LDR     R10, [SP,#0x4F0+var_4DC]
193 .text:75C7A3A4 13 80 D4 E5 LDRB    R8, [R4,#0x13]
194 .text:75C7A3A8 14 E0 D4 E5 LDRB    LR, [R4,#0x14]
195 .text:75C7A3AC 15 C0 D4 E5 LDRB    R12, [R4,#0x15]
196 .text:75C7A3B0 16 10 D4 E5 LDRB    R1, [R4,#0x16]
197 .text:75C7A3B4 18 20 CD E5 STRB    R2, [SP,#0x4F0+var_4D8]
198 .text:75C7A3B8 19 30 CD E5 STRB    R3, [SP,#0x4F0+var_4D8+1]
199 .text:75C7A3BC 17 20 D4 E5 LDRB    R2, [R4,#0x17]
200 .text:75C7A3C0 18 30 D4 E5 LDRB    R3, [R4,#0x18]
201 .text:75C7A3C4 0A 00 A0 E1 MOV     R0, R10                         ; unsigned int
202 .text:75C7A3C8 1A 80 CD E5 STRB    R8, [SP,#0x4F0+var_4D8+2]
203 .text:75C7A3CC 1B E0 CD E5 STRB    LR, [SP,#0x4F0+var_4D8+3]
204 .text:75C7A3D0 1C C0 CD E5 STRB    R12, [SP,#0x4F0+var_4D4]
205 .text:75C7A3D4 1D 10 CD E5 STRB    R1, [SP,#0x4F0+var_4D4+1]
206 .text:75C7A3D8 1E 20 CD E5 STRB    R2, [SP,#0x4F0+var_4D4+2]
207 .text:75C7A3DC 1F 30 CD E5 STRB    R3, [SP,#0x4F0+var_4D4+3]
208 .text:75C7A3E0 9C E0 FF EB BL      malloc_0
209 .text:75C7A3E4 00 10 A0 E3 MOV     R1, #0
210 .text:75C7A3E8 00 80 A0 E1 MOV     R8, R0
211 .text:75C7A3EC 00 20 A0 E1 MOV     R2, R0                          ; char *
212 .text:75C7A3F0 00 10 8D E5 STR     R1, [SP,#0x4F0+var_4F0]         ; int
213 .text:75C7A3F4 0A 30 A0 E1 MOV     R3, R10                         ; unsigned int
214 .text:75C7A3F8 06 00 A0 E1 MOV     R0, R6                          ; this
215 .text:75C7A3FC 19 10 84 E2 ADD     R1, R4, #0x19                   ; char *
216 .text:75C7A400 12 F9 FF EB BL      _ZN10llIlIlIlll10lllIIIllIIEPKcPcji ; llIlIlIlll::lllIIIllII(char const*,char *,uint,int)
217 .text:75C7A404 1C B0 9D E5 LDR     R11, [SP,#0x4F0+var_4D4]
218 .text:75C7A408 0B 00 A0 E1 MOV     R0, R11                         ; unsigned int
219 .text:75C7A40C 91 E0 FF EB BL      malloc_0                        ; 分配内存放解密后数据
220 .text:75C7A410 00 C0 A0 E3 MOV     R12, #0
221 .text:75C7A414 20 30 8D E2 ADD     R3, SP, #0x4F0+var_4D0
222 .text:75C7A418 00 A0 A0 E1 MOV     R10, R0
223 .text:75C7A41C 04 30 8D E5 STR     R3, [SP,#0x4F0+var_4EC]
224 .text:75C7A420 18 20 9D E5 LDR     R2, [SP,#0x4F0+var_4D8]
225 .text:75C7A424 00 30 A0 E1 MOV     R3, R0
226 .text:75C7A428 00 B0 8D E5 STR     R11, [SP,#0x4F0+var_4F0]
227 .text:75C7A42C 01 00 A0 E3 MOV     R0, #1
228 .text:75C7A430 08 10 A0 E1 MOV     R1, R8
229 .text:75C7A434 20 C0 8D E5 STR     R12, [SP,#0x4F0+var_4D0]
230 .text:75C7A438 21 1E 00 EB BL      _Z10IlllIIIIll10IIlIlIlllIPKhjPhjPj ; 解密出明文dll
231 .text:75C7A43C 00 00 50 E3 CMP     R0, #0
232 .text:75C7A440 3A 00 00 0A BEQ     loc_75C7A530
233 .text:75C7A444
234 .text:75C7A444             loc_75C7A444                            ; CODE XREF: hook_mono_image_open_from_data_with_name+418↓j
235 .text:75C7A444 0A 00 A0 E1 MOV     R0, R10                         ; void *
236 .text:75C7A448 90 E0 FF EB BL      _Z10IIIIIllIIlPv                ; IIIIIllIIl(void *)
237 .text:75C7A44C 08 00 A0 E1 MOV     R0, R8                          ; void *
238 .text:75C7A450 8E E0 FF EB BL      _Z10IIIIIllIIlPv                ; IIIIIllIIl(void *)
239 .text:75C7A454 06 00 A0 E1 MOV     R0, R6                          ; this
240 .text:75C7A458 DC F0 FF EB BL      _ZN10llIlIlIlllD2Ev             ; llIlIlIlll::~llIlIlIlll()
241 .text:75C7A45C
242 .text:75C7A45C             loc_75C7A45C                            ; CODE XREF: hook_mono_image_open_from_data_with_name+88↑j
243 .text:75C7A45C                                                     ; hook_mono_image_open_from_data_with_name+11C↑j ...
244 .text:75C7A45C F0 34 9D E5 LDR     R3, [SP,#0x4F0+arg_0]
245 .text:75C7A460 6C 11 9F E5 LDR     R1, =(dword_75CB4068 - 0x75C7A474)
246 .text:75C7A464 04 70 8D E5 STR     R7, [SP,#0x4F0+var_4EC]
247 .text:75C7A468 00 30 8D E5 STR     R3, [SP,#0x4F0+var_4F0]
248 .text:75C7A46C 01 10 8F E0 ADD     R1, PC, R1                      ; dword_75CB4068
249 .text:75C7A470 08 C0 91 E5 LDR     R12, [R1,#(dword_75CB4070 - 0x75CB4068)]
250 .text:75C7A474 0C 20 9D E5 LDR     R2, [SP,#0x4F0+var_4E4]
251 .text:75C7A478 09 30 A0 E1 MOV     R3, R9
252 .text:75C7A47C 04 00 A0 E1 MOV     R0, R4
253 .text:75C7A480 05 10 A0 E1 MOV     R1, R5
254 .text:75C7A484 3C FF 2F E1 BLX     R12
255 .text:75C7A488 00 80 A0 E1 MOV     R8, R0
256 .text:75C7A48C
257 .text:75C7A48C             loc_75C7A48C                            ; CODE XREF: hook_mono_image_open_from_data_with_name+3F4↓j
258 .text:75C7A48C 44 11 9F E5 LDR     R1, =(unk_75CACB70 - 0x75C7A49C)
259 .text:75C7A490 06 00 A0 E1 MOV     R0, R6                          ; this
260 .text:75C7A494 01 10 8F E0 ADD     R1, PC, R1                      ; unk_75CACB70 ; char *
261 .text:75C7A498 B0 FA FF EB BL      DecString
262 .text:75C7A49C 06 00 A0 E1 MOV     R0, R6
263 .text:75C7A4A0 94 F9 FF EB BL      _ZN10lIIIlIlIIlcvPcEv           ; lIIIlIlIIl::operator char *(void)
264 .text:75C7A4A4 00 10 A0 E1 MOV     R1, R0                          ; needle
265 .text:75C7A4A8 07 00 A0 E1 MOV     R0, R7                          ; haystack
266 .text:75C7A4AC 69 D9 FF EB BL      strstr
267 .text:75C7A4B0 00 70 A0 E1 MOV     R7, R0
268 .text:75C7A4B4 06 00 A0 E1 MOV     R0, R6                          ; this
269 .text:75C7A4B8 6C F9 FF EB BL      _ZN10lIIIlIlIIlD2Ev             ; lIIIlIlIIl::~lIIIlIlIIl()
270 .text:75C7A4BC 00 00 57 E3 CMP     R7, #0
271 .text:75C7A4C0 00 00 55 13 CMPNE   R5, #0
272 .text:75C7A4C4 04 00 00 0A BEQ     loc_75C7A4DC
273 .text:75C7A4C8 00 30 A0 E3 MOV     R3, #0
274 .text:75C7A4CC 05 50 84 E0 ADD     R5, R4, R5
275 .text:75C7A4D0
276 .text:75C7A4D0             loc_75C7A4D0                            ; CODE XREF: hook_mono_image_open_from_data_with_name+3A0↓j
277 .text:75C7A4D0 01 30 C4 E4 STRB    R3, [R4],#1
278 .text:75C7A4D4 05 00 54 E1 CMP     R4, R5
279 .text:75C7A4D8 FC FF FF 1A BNE     loc_75C7A4D0
280 .text:75C7A4DC
281 .text:75C7A4DC             loc_75C7A4DC                            ; CODE XREF: hook_mono_image_open_from_data_with_name+38C↑j
282 .text:75C7A4DC                                                     ; hook_mono_image_open_from_data_with_name+3EC↓j
283 .text:75C7A4DC 08 30 9D E5 LDR     R3, [SP,#0x4F0+var_4E8]
284 .text:75C7A4E0 C4 24 9D E5 LDR     R2, [SP,#0x4F0+var_2C]
285 .text:75C7A4E4 08 00 A0 E1 MOV     R0, R8
286 .text:75C7A4E8 00 30 93 E5 LDR     R3, [R3]
287 .text:75C7A4EC 03 00 52 E1 CMP     R2, R3
288 .text:75C7A4F0 24 00 00 1A BNE     loc_75C7A588
289 .text:75C7A4F4 13 DD 8D E2 ADD     SP, SP, #0x4C0
290 .text:75C7A4F8 0C D0 8D E2 ADD     SP, SP, #0xC
291 .text:75C7A4FC F0 8F BD E8 LDMFD   SP!, {R4-R11,PC}
解密后 dump dll R10是基址,R11是大小,如下图:
 1 static main(void)
 2     {
 3         auto fp, begin, end, dexbyte;
 4         fp = fopen("d:\\dump.dll", "wb"); //打开或创建一个文件
 5         begin =  R10;              //dll基址
 6         end = begin + R11;            //dll基址 + dll文件大小
 7         for ( dexbyte = begin; dexbyte < end;dexbyte ++ )
 8         {
 9             fputc(Byte(dexbyte), fp);     //按字节将其dump到本地文件中
10         }
11     }

将dump出来的dll反编后如下图:

3.在hook_mono_assembly_load_from_full主要是计算将解密dll的PE头清楚后的计算crc值。

七: libengine模块分析

1. 在com/inca/security/Core/AppGuardEngine类中注册的第一个Native函数中通过dlopen、dlsym调用libengine.sox解密的so

JNI比函数   .text:75C81168  IlIIIIIIII (文件偏移 13168)  (Landroid/content/Context;Ljava/lang/String;[B)I

2.通过dlopen、dlsym获取下面3个函数。

以下这几个函数被调用

Initialize (文件偏移27144)

CreateObject  (文件偏移2A2F4)

Clazz::IlIllllIIl (文件偏移2B1B0)

3. Initialize函数

 1 //反调试 
 2 /data/data/com.digitalsky.girlsfrontline.cn/files/95c72528dc4c1ef12d2bf750585fed56eca973a8    7CE87000    00102000
 3 .text:7CEAE17A             loc_7CEAE17A                            ; CODE XREF: Initialize+32↑j
 4 .text:7CEAE17A CC 4B       LDR     R3, =(_ZN10lllllIIIll11IIlIlIIIlllE_ptr - 0x7CF87D44)
 5 .text:7CEAE17C EB 58       LDR     R3, [R5,R3]
 6 .text:7CEAE17E 1E 60       STR     R6, [R3]                        ; lllllIIIll::IIlIlIIIlll
 7 .text:7CEAE180 19 F0 B6 FD BL      Anit_Dbg                        ; 反调试(读进程状态)
 8 .text:7CEAE184 B8 42       CMP     R0, R7
 9 .text:7CEAE186 00 D0       BEQ     loc_7CEAE18A
10 .text:7CEAE188 D4 E1       B       loc_7CEAE534
11 
12 //动态获取函数
13 .text:7CEAE33A             loc_7CEAE33A                            ; CODE XREF: Initialize+1F2↑j
14 .text:7CEAE33A 1A 60       STR     R2, [R3]                        ; Global::llIlIllllI
15 .text:7CEAE33C 1E F0 DA FC BL      GetlibcFunc
16 .text:7CEAE340 1F F0 76 FD BL      GetlibdvmFunc
17 .text:7CEAE344 00 28       CMP     R0, #0
18 .text:7CEAE346 04 D0       BEQ     loc_7CEAE352
19 .text:7CEAE348 67 4B       LDR     R3, =(_ZN6Global11llllIIlIlIIE_ptr - 0x7CF87D44)
20 .text:7CEAE34A EB 58       LDR     R3, [R5,R3]
21 .text:7CEAE34C 04 93       STR     R3, [SP,#0x1A8+var_198]
22 .text:7CEAE34E 01 23       MOVS    R3, #1
23 .text:7CEAE350 1E E0       B       loc_7CEAE390

4. CreateObject函数

计算libengine.sox解密后的函数crc (文件偏移 2A1F6)

  1 /data/data/com.digitalsky.girlsfrontline.cn/files/95c72528dc4c1ef12d2bf750585fed56eca973a8    7CF7A000    00102000
  2 
  3 .text:7CFA41F6             loc_7CFA41F6                            ; CODE XREF: IlllIIIlll::IlllIIIlll(_JNIEnv *,void *)+324↓j
  4 .text:7CFA41F6 39 4B       LDR     R3, =(_ZN6Global11lIIIIIIIIIIE_ptr - 0x7D07AD44)
  5 .text:7CFA41F8 07 9A       LDR     R2, [SP,#0xF8+var_DC]
  6 .text:7CFA41FA F3 58       LDR     R3, [R6,R3]
  7 .text:7CFA41FC 10 1C       MOVS    R0, R2                          ; void *
  8 .text:7CFA41FE 1A 60       STR     R2, [R3]                        ; Global::lIIIIIIIIII
  9 .text:7CFA4200 34 F0 26 F8 BL      GetCrc32                        ; 计算libengine.sox解密后的函数crc
 10 .text:7CFA4204 36 4B       LDR     R3, =(_ZN6Global11lIIlIlIIIlIE_ptr - 0x7D07AD44)
 11 计算CRC函数代码如下:
 12 .text:7CFD8250             EXPORT GetCrc32
 13 .text:7CFD8250             GetCrc32                                ; CODE XREF: IlllIIIlll::IlllIIIlll(_JNIEnv *,void *)+2E4↑p
 14 .text:7CFD8250                                                     ; IlllIllIll::lIIIllIlIll(lIIIllIlllII *,int,IIlIllIlllll *,bool *,char *,bool)+88↑p ...
 15 .text:7CFD8250             ; __unwind {
 16 .text:7CFD8250 F8 B5       PUSH    {R3-R7,LR}
 17 .text:7CFD8252 22 4B       LDR     R3, =(_ZN6Global10lIIllIllIlE_ptr - 0x7CFD825A)
 18 .text:7CFD8254 00 25       MOVS    R5, #0
 19 .text:7CFD8256 7B 44       ADD     R3, PC                          ; _ZN6Global10lIIllIllIlE_ptr
 20 .text:7CFD8258 1B 68       LDR     R3, [R3]                        ; Global::lIIllIllIl
 21 .text:7CFD825A 1B 68       LDR     R3, [R3]                        ; Global::lIIllIllIl
 22 .text:7CFD825C 17 2B       CMP     R3, #0x17
 23 .text:7CFD825E 3B DC       BGT     loc_7CFD82D8
 24 .text:7CFD8260 04 1C       MOVS    R4, R0
 25 .text:7CFD8262 17 2B       CMP     R3, #0x17
 26 .text:7CFD8264 08 D1       BNE     loc_7CFD8278
 27 .text:7CFD8266 1E 48       LDR     R0, =(_ZN6Global11IlIIIIlllllE_ptr - 0x7CFD826E)
 28 .text:7CFD8268 1E 49       LDR     R1, =(aN - 0x7CFD8272)
 29 .text:7CFD826A 78 44       ADD     R0, PC                          ; _ZN6Global11IlIIIIlllllE_ptr
 30 .text:7CFD826C 00 68       LDR     R0, [R0]                        ; Global::IlIIIIlllll
 31 .text:7CFD826E 79 44       ADD     R1, PC                          ; "N"
 32 .text:7CFD8270 48 F0 BE FB BL      j_strcmp
 33 .text:7CFD8274 A8 42       CMP     R0, R5
 34 .text:7CFD8276 2F D0       BEQ     loc_7CFD82D8
 35 .text:7CFD8278
 36 .text:7CFD8278             loc_7CFD8278                            ; CODE XREF: GetCrc32+14↑j
 37 .text:7CFD8278 00 26       MOVS    R6, #0
 38 .text:7CFD827A 23 1C       MOVS    R3, R4
 39 .text:7CFD827C 30 1C       MOVS    R0, R6                          ; this
 40 .text:7CFD827E B0 33       ADDS    R3, #0xB0
 41 .text:7CFD8280 1F 68       LDR     R7, [R3]
 42 .text:7CFD8282
 43 .text:7CFD8282             loc_7CFD8282                            ; CODE XREF: GetCrc32+84↓j
 44 .text:7CFD8282 23 1C       MOVS    R3, R4
 45 .text:7CFD8284 B4 33       ADDS    R3, #0xB4
 46 .text:7CFD8286 1B 68       LDR     R3, [R3]
 47 .text:7CFD8288 9E 42       CMP     R6, R3                          ; 判断是否结束
 48 .text:7CFD828A 24 D2       BCS     loc_7CFD82D6
 49 .text:7CFD828C 23 1C       MOVS    R3, R4
 50 .text:7CFD828E BC 33       ADDS    R3, #0xBC
 51 .text:7CFD8290 1B 68       LDR     R3, [R3]
 52 .text:7CFD8292 B2 00       LSLS    R2, R6, #2
 53 .text:7CFD8294 D5 58       LDR     R5, [R2,R3]
 54 .text:7CFD8296
 55 .text:7CFD8296             loc_7CFD8296                            ; CODE XREF: GetCrc32+80↓j
 56 .text:7CFD8296 00 2D       CMP     R5, #0
 57 .text:7CFD8298 1B D0       BEQ     loc_7CFD82D2
 58 .text:7CFD829A 2B 01       LSLS    R3, R5, #4
 59 .text:7CFD829C FB 18       ADDS    R3, R7, R3                      ; unsigned int
 60 .text:7CFD829E 19 7B       LDRB    R1, [R3,#0xC]
 61 .text:7CFD82A0 0A 11       ASRS    R2, R1, #4
 62 .text:7CFD82A2 01 3A       SUBS    R2, #1
 63 .text:7CFD82A4 01 2A       CMP     R2, #1
 64 .text:7CFD82A6 0E D8       BHI     loc_7CFD82C6
 65 .text:7CFD82A8 DA 89       LDRH    R2, [R3,#0xE]
 66 .text:7CFD82AA 00 2A       CMP     R2, #0
 67 .text:7CFD82AC 0B D0       BEQ     loc_7CFD82C6
 68 .text:7CFD82AE 0F 22       MOVS    R2, #0xF
 69 .text:7CFD82B0 0A 40       ANDS    R2, R1
 70 .text:7CFD82B2 02 2A       CMP     R2, #2
 71 .text:7CFD82B4 07 D1       BNE     loc_7CFD82C6
 72 .text:7CFD82B6 22 1C       MOVS    R2, R4
 73 .text:7CFD82B8 8C 32       ADDS    R2, #0x8C
 74 .text:7CFD82BA 11 68       LDR     R1, [R2]
 75 .text:7CFD82BC 5A 68       LDR     R2, [R3,#4]
 76 .text:7CFD82BE 51 18       ADDS    R1, R2, R1                      ; unsigned int
 77 .text:7CFD82C0 9A 68       LDR     R2, [R3,#8]                     ; unsigned __int8 *
 78 .text:7CFD82C2 E5 F7 F1 FF BL      adler_adler32                   ; R1函数首地址,R2函数大小
 79 .text:7CFD82C6
 80 .text:7CFD82C6             loc_7CFD82C6                            ; CODE XREF: GetCrc32+56↑j
 81 .text:7CFD82C6                                                     ; GetCrc32+5C↑j ...
 82 .text:7CFD82C6 23 1C       MOVS    R3, R4
 83 .text:7CFD82C8 C0 33       ADDS    R3, #0xC0
 84 .text:7CFD82CA 1B 68       LDR     R3, [R3]
 85 .text:7CFD82CC AD 00       LSLS    R5, R5, #2
 86 .text:7CFD82CE 5D 59       LDR     R5, [R3,R5]
 87 .text:7CFD82D0 E1 E7       B       loc_7CFD8296
 88 .text:7CFD82D2             ; ---------------------------------------------------------------------------
 89 .text:7CFD82D2
 90 .text:7CFD82D2             loc_7CFD82D2                            ; CODE XREF: GetCrc32+48↑j
 91 .text:7CFD82D2 01 36       ADDS    R6, #1
 92 .text:7CFD82D4 D5 E7       B       loc_7CFD8282
 93 .text:7CFD82D6             ; ---------------------------------------------------------------------------
 94 .text:7CFD82D6
 95 .text:7CFD82D6             loc_7CFD82D6                            ; CODE XREF: GetCrc32+3A↑j
 96 .text:7CFD82D6 05 1C       ADDS    R5, R0, #0
 97 .text:7CFD82D8
 98 .text:7CFD82D8             loc_7CFD82D8                            ; CODE XREF: GetCrc32+E↑j
 99 .text:7CFD82D8                                                     ; GetCrc32+26↑j
100 .text:7CFD82D8 28 1C       MOVS    R0, R5
101 .text:7CFD82DA F8 BD       POP     {R3-R7,PC}

5. IlIllllIIl 函数

计算libc.so代码节的crc值 与.text节的CRC(文件偏移398AE)

1 /data/data/com.digitalsky.girlsfrontline.cn/files/95c72528dc4c1ef12d2bf750585fed56eca973a8    77763000    00102000
2 .text:7779C8AE 59 68       LDR     R1, [R3,#4]
3 .text:7779C8B0 33 69       LDR     R3, [R6,#0x10]                  ; unsigned int
4 .text:7779C8B2 C9 18       ADDS    R1, R1, R3                      ; unsigned int
5 .text:7779C8B4 0A F0 F8 FC BL      _ZN5adler7adler32EmPKhj         ; 计算libc.so代码节的crc值 AA4AC826

6.计算libcompatible.so函数的Crc与.text节的CRC

  1 .text:7C88BAB2
  2 .text:7C88BAB2             ; IlllIIIIlIl(IlIIlIIIll *)
  3 .text:7C88BAB2             EXPORT _Z11IlllIIIIlIlP10IlIIlIIIll
  4 .text:7C88BAB2             _Z11IlllIIIIlIlP10IlIIlIIIll            ; CODE XREF: IlllIllIll::IlIllIllll(lIIIllIlllII *,int,IIlIllIlllll *,bool *,char *,bool)+196↑p
  5 .text:7C88BAB2                                                     ; IlllIllIll::IlllIllIll(_jobject *,int,long long,long long,uint,char **,char **,char **,char **,char **)+80C↑p
  6 .text:7C88BAB2             ; __unwind {
  7 .text:7C88BAB2 F8 B5       PUSH    {R3-R7,LR}
  8 .text:7C88BAB4 00 26       MOVS    R6, #0
  9 .text:7C88BAB6 FC 30       ADDS    R0, #0xFC
 10 .text:7C88BAB8 04 1C       MOVS    R4, R0
 11 .text:7C88BABA 87 6C       LDR     R7, [R0,#0x48]
 12 .text:7C88BABC 30 1C       ADDS    R0, R6, #0                      ; this
 13 .text:7C88BABE
 14 .text:7C88BABE             loc_7C88BABE                            ; CODE XREF: IlllIIIIlIl(IlIIlIIIll *)+4E↓j
 15 .text:7C88BABE A3 6A       LDR     R3, [R4,#0x28]
 16 .text:7C88BAC0 9E 42       CMP     R6, R3                          ; 判断函数个数是否结束
 17 .text:7C88BAC2 1E D2       BCS     locret_7C88BB02
 18 .text:7C88BAC4 22 6B       LDR     R2, [R4,#0x30]
 19 .text:7C88BAC6 B3 00       LSLS    R3, R6, #2
 20 .text:7C88BAC8 9D 58       LDR     R5, [R3,R2]
 21 .text:7C88BACA
 22 .text:7C88BACA             loc_7C88BACA                            ; CODE XREF: IlllIIIIlIl(IlIIlIIIll *)+4A↓j
 23 .text:7C88BACA 00 2D       CMP     R5, #0
 24 .text:7C88BACC 17 D0       BEQ     loc_7C88BAFE                    ; i++
 25 .text:7C88BACE 2B 01       LSLS    R3, R5, #4
 26 .text:7C88BAD0 FB 18       ADDS    R3, R7, R3                      ; unsigned int
 27 .text:7C88BAD2 19 7B       LDRB    R1, [R3,#0xC]
 28 .text:7C88BAD4 0A 11       ASRS    R2, R1, #4
 29 .text:7C88BAD6 01 3A       SUBS    R2, #1
 30 .text:7C88BAD8 01 2A       CMP     R2, #1
 31 .text:7C88BADA 0C D8       BHI     loc_7C88BAF6
 32 .text:7C88BADC DA 89       LDRH    R2, [R3,#0xE]
 33 .text:7C88BADE 00 2A       CMP     R2, #0
 34 .text:7C88BAE0 09 D0       BEQ     loc_7C88BAF6
 35 .text:7C88BAE2 0F 22       MOVS    R2, #0xF
 36 .text:7C88BAE4 0A 40       ANDS    R2, R1
 37 .text:7C88BAE6 02 2A       CMP     R2, #2
 38 .text:7C88BAE8 05 D1       BNE     loc_7C88BAF6
 39 .text:7C88BAEA 5A 68       LDR     R2, [R3,#4]
 40 .text:7C88BAEC 21 6A       LDR     R1, [R4,#0x20]
 41 .text:7C88BAEE 51 18       ADDS    R1, R2, R1                      ; unsigned int
 42 .text:7C88BAF0 9A 68       LDR     R2, [R3,#8]                     ; unsigned __int8 *
 43 .text:7C88BAF2 E5 F7 D9 FB BL      adler_adler32                   ; 计算crc32
 44 .text:7C88BAF6
 45 .text:7C88BAF6             loc_7C88BAF6                            ; CODE XREF: IlllIIIIlIl(IlIIlIIIll *)+28↑j
 46 .text:7C88BAF6                                                     ; IlllIIIIlIl(IlIIlIIIll *)+2E↑j ...
 47 .text:7C88BAF6 63 6B       LDR     R3, [R4,#0x34]
 48 .text:7C88BAF8 AD 00       LSLS    R5, R5, #2
 49 .text:7C88BAFA 5D 59       LDR     R5, [R3,R5]
 50 .text:7C88BAFC E5 E7       B       loc_7C88BACA
 51 .text:7C88BAFE             ; ---------------------------------------------------------------------------
 52 .text:7C88BAFE
 53 .text:7C88BAFE             loc_7C88BAFE                            ; CODE XREF: IlllIIIIlIl(IlIIlIIIll *)+1A↑j
 54 .text:7C88BAFE 01 36       ADDS    R6, #1                          ; i++
 55 .text:7C88BB00 DD E7       B       loc_7C88BABE
 56 .text:7C88BB02             ; ---------------------------------------------------------------------------
 57 .text:7C88BB02
 58 .text:7C88BB02             locret_7C88BB02                         ; CODE XREF: IlllIIIIlIl(IlIIlIIIll *)+10↑j
 59 .text:7C88BB02 F8 BD       POP     {R3-R7,PC}
 60 计算so的.text节代码的crc值 (文件偏移 39860)
 61 ,text:7C866860                                                     ; IlllIllIll::IlllIllIll(_jobject *,int,long long,long long,uint,char **,char **,char **,char **,char **)+8E2↑j
 62 .text:7C866860 00 23       MOVS    R3, #0
 63 .text:7C866862 06 93       STR     R3, [SP,#0xB20+var_B08]
 64 .text:7C866864 03 9B       LDR     R3, [SP,#0xB20+var_B14]
 65 .text:7C866866 00 2B       CMP     R3, #0
 66 .text:7C866868 2C D0       BEQ     loc_7C8668C4                    ; 结束
 67 .text:7C86686A
 68 .text:7C86686A             loc_7C86686A                            ; CODE XREF: IlllIllIll::IlllIllIll(_jobject *,int,long long,long long,uint,char **,char **,char **,char **,char **)+94A↓j
 69 .text:7C86686A 06 9B       LDR     R3, [SP,#0xB20+var_B08]
 70 .text:7C86686C 09 9A       LDR     R2, [SP,#0xB20+var_AFC]
 71 .text:7C86686E 93 42       CMP     R3, R2                          ; 判断是否结束
 72 .text:7C866870 28 D0       BEQ     loc_7C8668C4                    ; 结束
 73 .text:7C866872 28 1C       MOVS    R0, R5                          ; this
 74 .text:7C866874 06 99       LDR     R1, [SP,#0xB20+var_B08]         ; unsigned int
 75 .text:7C866876 1C F0 46 FE BL      _ZN10lIIIIllIII10lIlIIlIIll10IlIIlIlIllEj ; lIIIIllIII::lIlIIlIIll::IlIIlIlIll(uint)
 76 .text:7C86687A 03 9B       LDR     R3, [SP,#0xB20+var_B14]
 77 .text:7C86687C 02 68       LDR     R2, [R0]
 78 .text:7C86687E 06 1C       MOVS    R6, R0
 79 .text:7C866880 98 18       ADDS    R0, R3, R2
 80 .text:7C866882 2B 68       LDR     R3, [R5]
 81 .text:7C866884 5A 68       LDR     R2, [R3,#4]
 82 .text:7C866886 9B 68       LDR     R3, [R3,#8]
 83 .text:7C866888 D3 18       ADDS    R3, R2, R3
 84 .text:7C86688A 98 42       CMP     R0, R3
 85 .text:7C86688C 1C D8       BHI     loc_7C8668C8
 86 .text:7C86688E 53 49       LDR     R1, =(aText - 0x7C866896)
 87 .text:7C866890 05 22       MOVS    R2, #5
 88 .text:7C866892 79 44       ADD     R1, PC                          ; ".text"
 89 .text:7C866894 6C F0 74 FE BL      j_strncmp                       ; 判断是否为.text
 90 .text:7C866898 00 28       CMP     R0, #0
 91 .text:7C86689A 0F D1       BNE     loc_7C8668BC
 92 .text:7C86689C D7 23       MOVS    R3, #0xD7
 93 .text:7C86689E 72 69       LDR     R2, [R6,#0x14]                  ; unsigned __int8 *
 94 .text:7C8668A0 9B 00       LSLS    R3, R3, #2
 95 .text:7C8668A2 FA 50       STR     R2, [R7,R3]
 96 .text:7C8668A4 D8 23       MOVS    R3, #0xD8
 97 .text:7C8668A6 31 69       LDR     R1, [R6,#0x10]
 98 .text:7C8668A8 9B 00       LSLS    R3, R3, #2
 99 .text:7C8668AA F9 50       STR     R1, [R7,R3]
100 .text:7C8668AC 2B 68       LDR     R3, [R5]
101 .text:7C8668AE 59 68       LDR     R1, [R3,#4]
102 .text:7C8668B0 33 69       LDR     R3, [R6,#0x10]                  ; unsigned int
103 .text:7C8668B2 C9 18       ADDS    R1, R1, R3                      ; unsigned int
104 .text:7C8668B4 0A F0 F8 FC BL      adler_adler32                   ; 计算libc.so代码节的crc值
105 .text:7C8668B8 0A 9B       LDR     R3, [SP,#0xB20+var_AF8]
106 .text:7C8668BA F8 50       STR     R0, [R7,R3]
107 .text:7C8668BC
108 .text:7C8668BC             loc_7C8668BC                            ; CODE XREF: IlllIllIll::IlllIllIll(_jobject *,int,long long,long long,uint,char **,char **,char **,char **,char **)+922↑j
109 .text:7C8668BC 06 9B       LDR     R3, [SP,#0xB20+var_B08]
110 .text:7C8668BE 01 33       ADDS    R3, #1

7.判断是否有种破解工具与是否在模拟器中运行,创建线程检测比较CRC值。

检测是否有的非法工具部分字符串如下:

  1 LuckyPatcher v4.1.9(幸运破解器)
  2 LuckyPatcher v5.8.9
  3 gamehacker (烧饼游戏修改器)
  4 com.cih.game_cih:*(金手指)
  5 (com.huluxia.gametools)葫芦侠
  6 Cheat Engine修改器 
  7 tcpdump
  8 GenyMotion(模拟器)
  9 Windroy
 10 BlueStacks
 11 org.sbtools.gamespeed燒餅修改器
 12 org.game.master 游戏修改大师
 13 在线程中比较CRC值。
 14 .text:7D34674C             Cmp_Crc32                               ; CODE XREF: IlllIllIll::IIIlllIlllII(lIIIllIlllII *,IIlIllIlllll *)+40A↓p
 15 .text:7D34674C                                                     ; IlllIllIll::lIllllllIlII(lIIIllIlllII *,IIlIllIlllll *)+4EA↓p ...
 16 .text:7D34674C
 17 .text:7D34674C             var_20          = -0x20
 18 .text:7D34674C             var_1C          = -0x1C
 19 .text:7D34674C             arg_0           =  0
 20 .text:7D34674C             arg_8           =  8
 21 .text:7D34674C
 22 .text:7D34674C             ; __unwind {
 23 .text:7D34674C F7 B5                       PUSH    {R0-R2,R4-R7,LR}
 24 .text:7D34674E 0A AC                       ADD     R4, SP, #0x20+arg_8
 25 .text:7D346750 24 78                       LDRB    R4, [R4]
 26 .text:7D346752 00 94                       STR     R4, [SP,#0x20+var_20]
 27 .text:7D346754 00 29                       CMP     R1, #0
 28 .text:7D346756 05 D0                       BEQ     loc_7D346764
 29 .text:7D346758 09 25                       MOVS    R5, #9
 30 .text:7D34675A D4 00                       LSLS    R4, R2, #3
 31 .text:7D34675C 0C 19                       ADDS    R4, R1, R4
 32 .text:7D34675E 65 60                       STR     R5, [R4,#4]
 33 .text:7D346760 00 25                       MOVS    R5, #0
 34 .text:7D346762 A5 60                       STR     R5, [R4,#8]
 35 .text:7D346764
 36 .text:7D346764             loc_7D346764                            ; CODE XREF: Cmp_Crc32+A↑j
 37 .text:7D346764 00 9C                       LDR     R4, [SP,#0x20+var_20]
 38 .text:7D346766 00 2C                       CMP     R4, #0
 39 .text:7D346768 07 D1                       BNE     loc_7D34677A
 40 .text:7D34676A 8C 24 E4 00                 MOVS    R4, #0x460
 41 .text:7D34676E 04 19                       ADDS    R4, R0, R4
 42 .text:7D346770 24 68                       LDR     R4, [R4]
 43 .text:7D346772 A4 05                       LSLS    R4, R4, #0x16
 44 .text:7D346774 01 D5                       BPL     loc_7D34677A
 45 .text:7D346776
 46 .text:7D346776             loc_7D346776                            ; CODE XREF: Cmp_Crc32+38↓j
 47 .text:7D346776                                                     ; Cmp_Crc32+58↓j
 48 .text:7D346776 00 20                       MOVS    R0, #0
 49 .text:7D346778 46 E0                       B       locret_7D346808
 50 .text:7D34677A             ; ---------------------------------------------------------------------------
 51 .text:7D34677A
 52 .text:7D34677A             loc_7D34677A                            ; CODE XREF: Cmp_Crc32+1C↑j
 53 .text:7D34677A                                                     ; Cmp_Crc32+28↑j
 54 .text:7D34677A 24 4C                       LDR     R4, =(_ZN6Global10llIIIlIlIIE_ptr - 0x7D346780)
 55 .text:7D34677C 7C 44                       ADD     R4, PC          ; _ZN6Global10llIIIlIlIIE_ptr
 56 .text:7D34677E 24 68                       LDR     R4, [R4]        ; Global::llIIIlIlII
 57 .text:7D346780 26 78                       LDRB    R6, [R4]        ; Global::llIIIlIlII
 58 .text:7D346782 00 2E                       CMP     R6, #0
 59 .text:7D346784 F7 D1                       BNE     loc_7D346776
 60 .text:7D346786 1D 1C                       MOVS    R5, R3
 61 .text:7D346788 21 4B                       LDR     R3, =(_ZN6Global11lIIIIIIIIIIE_ptr - 0x7D346790)
 62 .text:7D34678A 04 1C                       MOVS    R4, R0
 63 .text:7D34678C 7B 44                       ADD     R3, PC          ; _ZN6Global11lIIIIIIIIIIE_ptr
 64 .text:7D34678E 1B 68                       LDR     R3, [R3]        ; Global::lIIIIIIIIII
 65 .text:7D346790 01 92                       STR     R2, [SP,#0x20+var_1C]
 66 .text:7D346792 0F 1C                       MOVS    R7, R1
 67 .text:7D346794 18 68                       LDR     R0, [R3]        ; void *
 68 .text:7D346796 29 F0 5B FD                 BL      GetCrc32
 69 .text:7D34679A 1E 4B                       LDR     R3, =(_ZN6Global11lIIlIlIIIlIE_ptr - 0x7D3467A0)
 70 .text:7D34679C 7B 44                       ADD     R3, PC          ; _ZN6Global11lIIlIlIIIlIE_ptr
 71 .text:7D34679E 1B 68                       LDR     R3, [R3]        ; Crc32Dword_E13E1FA9
 72 .text:7D3467A0 1B 68                       LDR     R3, [R3]
 73 .text:7D3467A2 98 42                       CMP     R0, R3          ; 比较crc32值
 74 .text:7D3467A4 E7 D0                       BEQ     loc_7D346776
 75 .text:7D3467A6 1C 4A                       LDR     R2, =(_ZN10IlllIllIll11llllIllIIIlE - 0x7D3467AC)
 76 .text:7D3467A8 7A 44                       ADD     R2, PC          ; IlllIllIll::llllIllIIIl
 77 .text:7D3467AA 13 68                       LDR     R3, [R2]        ; IlllIllIll::llllIllIIIl
 78 .text:7D3467AC 01 33                       ADDS    R3, #1
 79 .text:7D3467AE 13 60                       STR     R3, [R2]        ; IlllIllIll::llllIllIIIl
 80 .text:7D3467B0 00 2D                       CMP     R5, #0
 81 .text:7D3467B2 1D D0                       BEQ     loc_7D3467F0
 82 .text:7D3467B4 02 21                       MOVS    R1, #2
 83 .text:7D3467B6 2A 68                       LDR     R2, [R5]
 84 .text:7D3467B8 13 01                       LSLS    R3, R2, #4
 85 .text:7D3467BA EB 18                       ADDS    R3, R5, R3
 86 .text:7D3467BC 59 60                       STR     R1, [R3,#4]
 87 .text:7D3467BE 0A 21                       MOVS    R1, #0xA
 88 .text:7D3467C0 DE 60                       STR     R6, [R3,#0xC]
 89 .text:7D3467C2 99 60                       STR     R1, [R3,#8]
 90 .text:7D3467C4 1E 61                       STR     R6, [R3,#0x10]
 91 .text:7D3467C6 08 9B                       LDR     R3, [SP,#0x20+arg_0]
 92 .text:7D3467C8 01 32                       ADDS    R2, #1
 93 .text:7D3467CA 2A 60                       STR     R2, [R5]
 94 .text:7D3467CC 00 2B                       CMP     R3, #0
 95 .text:7D3467CE 02 D0                       BEQ     loc_7D3467D6
 96 .text:7D3467D0 01 23                       MOVS    R3, #1
 97 .text:7D3467D2 08 9A                       LDR     R2, [SP,#0x20+arg_0]
 98 .text:7D3467D4 13 70                       STRB    R3, [R2]
 99 .text:7D3467D6
100 .text:7D3467D6             loc_7D3467D6                            ; CODE XREF: Cmp_Crc32+82↑j
101 .text:7D3467D6 00 9B                       LDR     R3, [SP,#0x20+var_20]
102 .text:7D3467D8 00 2B                       CMP     R3, #0
103 .text:7D3467DA 09 D1                       BNE     loc_7D3467F0
104 .text:7D3467DC 8D 23 DB 00                 MOVS    R3, #0x468
105 .text:7D3467E0 E3 18                       ADDS    R3, R4, R3
106 .text:7D3467E2 1B 68                       LDR     R3, [R3]
107 .text:7D3467E4 9B 05                       LSLS    R3, R3, #0x16
108 .text:7D3467E6 03 D4                       BMI     loc_7D3467F0
109 .text:7D3467E8 0C 4A                       LDR     R2, =0x49C
110 .text:7D3467EA A3 58                       LDR     R3, [R4,R2]
111 .text:7D3467EC 01 33                       ADDS    R3, #1
112 .text:7D3467EE A3 50                       STR     R3, [R4,R2]
113 .text:7D3467F0
114 .text:7D3467F0             loc_7D3467F0                            ; CODE XREF: Cmp_Crc32+66↑j
115 .text:7D3467F0                                                     ; Cmp_Crc32+8E↑j ...
116 .text:7D3467F0 00 2F                       CMP     R7, #0
117 .text:7D3467F2 04 D0                       BEQ     loc_7D3467FE
118 .text:7D3467F4 01 9B                       LDR     R3, [SP,#0x20+var_1C]
119 .text:7D3467F6 DA 00                       LSLS    R2, R3, #3
120 .text:7D3467F8 AA 23                       MOVS    R3, #0xAA
121 .text:7D3467FA BA 18                       ADDS    R2, R7, R2
122 .text:7D3467FC 93 60                       STR     R3, [R2,#8]
123 .text:7D3467FE
124 .text:7D3467FE             loc_7D3467FE                            ; CODE XREF: Cmp_Crc32+A6↑j
125 .text:7D3467FE 01 20                       MOVS    R0, #1
126 .text:7D346800 07 4B                       LDR     R3, =(_ZN6Global10lIlIIllIIlE_ptr - 0x7D346806)
127 .text:7D346802 7B 44                       ADD     R3, PC          ; _ZN6Global10lIlIIllIIlE_ptr
128 .text:7D346804 1B 68                       LDR     R3, [R3]        ; Global::lIlIIllIIl
129 .text:7D346806 58 72                       STRB    R0, [R3,#(byte_7D413581 - 0x7D413578)]
130 .text:7D346808
131 .text:7D346808             locret_7D346808                         ; CODE XREF: Cmp_Crc32+2C↑j
132 .text:7D346808 FE BD                       POP     {R1-R7,PC}

截图监控

 1 .text:7D34B944 2A 49                       LDR     R1, =(unk_7D3E51F8 - 0x7D34B94E)
 2 .text:7D34B946 3D 59                       LDR     R5, [R7,R4]
 3 .text:7D34B948 7F AC                       ADD     R4, SP, #0xB20+var_924
 4 .text:7D34B94A 79 44                       ADD     R1, PC          ; unk_7D3E51F8
 5 .text:7D34B94C 20 1C                       MOVS    R0, R4          ; this
 6 .text:7D34B94E 4C 31                       ADDS    R1, #0x4C ; 'L' ; char *
 7 .text:7D34B950 0A F0 62 F8                 BL      DecString
 8 .text:7D34B954 20 1C                       MOVS    R0, R4
 9 .text:7D34B956 09 F0 77 FF                 BL      _ZN10IIllIIlIIIcvPcEv ; IIllIIlIII::operator char *(void)
10 .text:7D34B95A 01 1C                       MOVS    R1, R0
11 .text:7D34B95C 04 22                       MOVS    R2, #4
12 .text:7D34B95E 28 1C                       MOVS    R0, R5
13 .text:7D34B960 6D F0 9E F8                 BL      j_inotify_add_watch ; 截图监控
14 .text:7D34B964 E0 25 AD 00                 MOVS    R5, #0x380
15 .text:7D34B968 78 51                       STR     R0, [R7,R5]
16 .text:7D34B96A 20 1C                       MOVS    R0, R4          ; this
17 .text:7D34B96C 09 F0 42 FF                 BL      _ZN10IIllIIlIIID2Ev ; IIllIIlIII::~IIllIIlIII()
18 .text:7D34B970 7B 59                       LDR     R3, [R7,R5]
19 .text:7D34B972 00 2B                       CMP     R3, #0
20 .text:7D34B974 10 DA                       BGE     loc_7D34B998
21 .text:7D34B976 00 23                       MOVS    R3, #0
22 .text:7D34B978 1E 4A                       LDR     R2, =(a5eddcc418cda8d - 0x7D34B988)

八:总结

1.该反外挂系统主要有字符串加密保护,客户端完整性检查(CRC+签

名),函数及变量、反调试保护,系统so文件校验, 自身so文件校验,U3D防护,画面截屏保护,内存防修改保护,但是so本身只做了函数名混淆与字符串加密,代码没有做保护处理,逆向起来还是比较容易。

样本:链接: https://pan.baidu.com/s/1dFPbyLj 密码: 7h2r

本文参与腾讯云自媒体分享计划,欢迎正在阅读的你也加入,一起分享。

我来说两句

0 条评论
登录 后参与评论

相关文章

  • 某移动端防作弊产品技术原理浅析与个人方案构想

    工具环境: android4.4.4、IDA Pro 7.0、jeb3、sklearn机器学习库

    我是小三
  • 以攻击者角度学习某风控设备指纹产品

    该产品在安全防破解方面个人认为算是业 内做到了比较高标准的安全保护机制,主要表现在以下几点:

    我是小三
  • IOS防作弊产品技术原理分析

    1.由于IOS系统的不开放性,能获取的信息太少,所在IOS上的防作弊产品可做的功能就相比较于安卓要少很多了。硬件方面主要获取IDFA、IDFV这两个值,软件方面...

    我是小三
  • 中移集成-首届OneCity编程大赛复盘

    比赛链接:https://js.dclab.run/v2/cmptDetail.html?id=457 本文章代码链接:https://github.com/...

    致Great
  • 使用JavaScript调用Microsoft XMLDOM库进行XML字符串的解析

    Jerry Wang
  • PC逆向之代码还原技术,第五讲汇编中乘法的代码还原

    在汇编中,乘法指令使用 IMUL 或者 MUL指令. 一般有两种形式 IMUL reg,imm 这种指令格式是 reg * imm的结果 重新放到reg中. ...

    IBinary
  • python3 cookbook

    使用deque(maxlen=N)构造函数会新建一个固定大小的队列.当新的元素加入并且这个队列已满的时候,最老的元素会被移除掉.在队列两端插入或者删除元素时间复...

    py3study
  • HTML5 SVG+CSS3霓虹灯文字边框动画特效

    AlexTao
  • 创建SvcHost.exe调用的服务原理与实践

    1. 多个服务共享一个Svchost.exe进程利与弊 windows 系统服务分为独立进程和共享进程两种,在windows NT时只有服务...

    战神伽罗
  • PHP解析Markdown库,parsedown扩展自定义语法

    在开发系统过程中,有些信息编写储存是使用Markdown通用语法,但由于各个平台的会新增一些独特规范,一般的解析库都是只包含了标准语法,对于自定义语法是不支持解...

    宣言言言

扫码关注云+社区

领取腾讯云代金券