AST反混淆实战:大数组字面量元素替换

朱雀 2022-12-19 03:40 171阅读 0赞

声明:本文仅供学习研究，严禁用于非法用途，否则后果自负！如有侵权，请告知删除，谢谢。

### **缘由** ###

我在 [JS逆向:猿人学爬虫比赛第五题详细题解(上)][JS] 这篇文章里介绍了AST反混淆的思路，现在来看看 如何进行大数组字面量元素替换。

### **样例地址** ###

"aHR0cHM6Ly93d3cubmlrZS5jb20vc3RhdGljL2QwZmU4NDViOWEwdGkyMDkxYjg5NThmZjIxZDA0ZDg2YQ=="

### **样本分析** ###

将代码复制并格式化保存为js文件后，可以看到代码开头定义了这么一个数组:

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而后面的代码多次引用了该数组里的元素。如图:

![format_png][]

这样显示的非常的不直观。现在写个简单的插件来将数组的引用直接替换为元素。

### **思路** ###

1.  将上面的数组定义代码复制到AST处理代码中。  
    
2.  先处理十六进制的字符串，让字符串直观。
3.  遍历类似 \_ac\[607\] 的MemberExpression节点，再进行判断
4.  判断条件成立，进行替换。

### **插件编写** ###

一，使用 [利用AST解混淆先导知识:调用babel库反混淆代码模板][AST_babel] 这篇文章介绍的代码，并将数组定义代码复制到该代码中。

二,十六进制的字符串,使用 [JavaScript反混淆插件一:处理十六进制、中英文Unicode字符串或数值][JavaScript_Unicode] 这篇文章介绍的插件即可。

三，遍历类似 \_ac\[607\] 的MemberExpression节点:

const visitor = 
    {
      MemberExpression(path)
      {
      },
    }

四，条件判断，成立则替换:

运行后部分代码截图如下:

![format_png 1][]

这样看下来，比之前的代码要简单易读得多。而且，插件的编写也是非常的容易，几乎是零难度。

### **注意事项** ###

1.  数组元素需要全部为字面量。  
    
2.  要确保数组至始至终都没有被改变。  
    
3.  如果使用作用域可能会好点，不过对于有些代码无法使用作用域，这种方式更好。对特定的网站使用专用AST还原插件，效果会更好。

也行你觉得就算进行了数组元素的替换，距离分析出加密参数还很远，没什么用。不过**既然有方法能让代码更清晰一点，那为啥不用呢**？

大家有没有发现比正则替换简单多了？

[JS]: http://mp.weixin.qq.com/s?__biz=MzAwNTY1OTg0MQ%3D%3D&chksm=83237582b454fc943fb4700da3eac2ed59788749dec6bc7333cd8f117db878c6c5e5f112b73e&idx=1&mid=2647562284&scene=21&sn=650aaadd918c8a926723f75819a11edd#wechat_redirect
[format_png]: /images/20221120/cf1e6c4ce6c2406bb18bed155de81f0d.png
[AST_babel]: http://mp.weixin.qq.com/s?__biz=MzAwNTY1OTg0MQ%3D%3D&chksm=83237a5cb454f34a4fedd915f3ed77e0f563133a7a3e47cc9375f00661b25971579f2fec0fa3&idx=1&mid=2647562226&scene=21&sn=15627004407c3ec492c2cdd8285f6fff#wechat_redirect
[JavaScript_Unicode]: http://mp.weixin.qq.com/s?__biz=MzAwNTY1OTg0MQ%3D%3D&chksm=8323759db454fc8bfc3dd5c309bc1a274cc82913b26470e863b896c3605adb8df466ad86bd08&idx=1&mid=2647562291&scene=21&sn=bb94aafa13c95af8ff89771cb78f27d7#wechat_redirect
[format_png 1]: /images/20221120/29c984a543d24f2f91cdc46367915774.png