专栏首页咸鱼学PythonJS逆向 | JSF*ck,这个看着头大的加密其实很简单

JS逆向 | JSF*ck,这个看着头大的加密其实很简单

又到练手的时间了,今天聊一下 JSFuck

我遇到过有两款网站用的就是 JSFuck 加密的,这个转换风格第一次遇到的时候内心OS就和这个名字一样。

大家先看看下面的图,一句简单的 hello world 就可以转化为近 5w 字符,看着就头大:

JSFuck是什么?

在讲解决方案之前,我们先来聊聊 JSFuck 是啥?

下面这个网站是 JSFuck 的官网:

http://www.jsfuck.com/

我们可以使用它对我们原有的 JS 代码进行编码风格上的转换。

JSFuck 是使用 []()!+ 六种字符来表示原有的字符的,就像下面这样的对应关系:

false       =>  ![]
true        =>  !![]
undefined   =>  [][[]]
NaN         =>  +[![]]
0           =>  +[]
1           =>  +!+[]
2           =>  !+[]+!+[]
10          =>  [+!+[]]+[+[]]
Array       =>  []
Number      =>  +[]
String      =>  []+[]
Boolean     =>  ![]

当然还有更多的对应关系没有列出来,但是这并不重要,我们只需要知道 JSFuck 为啥长这样就可以了,更多知识可以加群讨论,接下来我们实战走一波,直接上解决方案。

如何在实战中处理 JSFuck?

JSFuck 的处理方法有以下几种:

document.write(xxx)
alert(xxx)
console.log(xxx)

这里的 xxx 指的就是 JSFuck 的内容,我们拿个例子测试一下。

这里本来想拿某文书网的 JSFuck 实战的,但是自从某文书网下了瑞数之后,整个网站频繁瘫痪,正常访问都是 502 。

所以这里用另一个例子演示一下:

复制 JSFuck ,打开 开发者模式,切换至 Console 选项卡,输入下面的内容并执行:

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执行结果如下:

这里看到提示Cannot read property 'attr' of null

不管他,我们注意到右手边的vm87:1, 点进去看看:

这里就是浏览器为我们还原的代码了,用其他的方法也是同样的效果。

本文完。

本文分享自微信公众号 - 咸鱼学Python(xianyuxuepython),作者:煌金的咸鱼

原文出处及转载信息见文内详细说明,如有侵权,请联系 yunjia_community@tencent.com 删除。

原始发表时间:2019-08-19

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。

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