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Js逆向教程-12FuckJs

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Js逆向教程-12FuckJs

f567258a127c4c4aa471f69eda8a2070 - Js逆向教程-12FuckJs

它利用了js的语法特性:

一、特性1

任何一个js类型的变量结果 加上一个字符串 ,只会变成字符串。

数组加上字符串:

[0]+""
'0'

true加上字符串

true + ""
'true'

数字加上字符串

1+""
'1'

二、特性2

2个值通过|运算会变成0或者1.

42fc6e2910894517ad1101dd79d231db - Js逆向教程-12FuckJs

通过这种特性 可以组合成各种各样的加密方式。

https://www.sojson.com/jsfuck.html

比如这样一行代码,通过加密后:

console.log(1)

142f232537e44b14b4258998e5577c94 - Js逆向教程-12FuckJs

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可以看到只有这3种字符。

这个的原理就是将各种字符串加起来。

jsfuck有对应的解密工具及。

所以这个调试起来很麻烦 只能单步调试 还是用解密工具解密。

我们这里只是讲解js的混淆机制。

我们的目的为了让js代码运行起来。可以不需要解密,将代码扣出来运行就可以。

通过fiddler插件直接运行代码:

5232524000454d92b4c7c5864fc9dd34 - Js逆向教程-12FuckJs

转载请注明:虚坏叔叔 » Js逆向教程-12FuckJs

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