某某网站AES算法JS逆向分析(JS逆向第八期)

    时隔一周，我又回来更新了！本期继续分享JS逆向章节；今天分享的内容是某某网站的Response响应体加密，如果不够细心，甚至都不知道内容从哪里加载生成的。全程高能，在阅读的同时不要忘记点赞+关注！

特别声明：本公众号文章只作为学术研究，不用于其它用途。

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 目录

①    前言介绍

②    参数分析

③    断点调试

④    算法还原

⑤    总结分享

趣味模块

      小明是一名工程师，有一次他去相亲，正好相亲对象也是一名工程师。两人见面后，女孩递给小明一张纸条，上面的内容是一段经过加密处理后的字符串，小明看得有点懵逼。女孩对小明说，你要能解开这个加密，就能知道我的联系方式，然后女孩留下两条关键信息就走了。小明看着这张纸条，思考了很久，不知道女孩子葫芦里卖的什么瓜！你能帮小明破解这条加密数据吗？

一、前言介绍

      我们在以往的文章中都是提到了如何从Request对象体：data、params、Headers中去还原加密参数。而今天的文章中，你会发现，和之前的套路不一样了，Request的参数都是明文的，而我们无法定位到Response在哪里，遇到这样的问题，该如何解决这类型的问题获取明文信息呢？带着这些疑问耐心看完本篇文章，你就豁然开朗了！

二、参数分析

1、首先打开我们今天要模拟的网站，刷新当前页面，刷新后查看开发者工具如下：

2、经过分析可以确定该接口即为我们要获取数据的地址，因为翻页时候参数地址会变动，求证如下：

3、对该接口参数进行分析

request参数分析：

isFake：固定值。

pg：当前页面(第几页)。

pgsz：每页的展示数量。

headers参数分析：​

说明：由于headers参数没有重要参数影响，故不作说明。

response响应体分析(图片如下)：​

通过分析，我们可以确定response是被加密处理了。如果要还原加密前的值，我们需要进行JS断点调试分析了。

三、断点调试

使用xhr打上断点，当该请求发包的时候，捕获断点如下：

进入该函数，截取断点片段如下：

此时，我们看到参数t.data即为我们想要获取的加密参数，这个地方我们怀疑是做了参数解密处理，进入该函数，截图如下：

我们先不看函数的逻辑，直接在第823打上断点，执行操作，如下图所示：

此时的return返回值即为我们想要获取的明文信息，整个流程贯通后，我们只需要对js代码进行还原即可。

四、算法还原

1、JS版本算法还原

/*使用的是AES cbc模式，需要key，iv。加密前对数据转变为16进制字节数组。
/* 对数组进行base64编码，传递给aes进行解密。
var oo = require('crypto-js');
function h(t) {
    var f = oo.enc.Utf8.parse("jo8j9wGw%6HbxfFn")
    var m = oo.enc.Utf8.parse("0123456789ABCDEF");
    var e = oo.enc.Hex.parse(t)
      , n = oo.enc.Base64.stringify(e)
      , a = oo.AES.decrypt(n, f, {
        iv: m,
        mode: oo.mode.CBC,
        padding: oo.pad.Pkcs7
    })
      , r = a.toString(oo.enc.Utf8);
    return r.toString()
}
var result = h("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18eb83e841bf7c29026ad4ee23404968b244c8b0f9d0af0f08f3bab62a045e0ac56a284e1da7d825b9f8b5147529a6ed4dff1e18191ec553f04945e75c66d4b7554727b6455ec1b6ee5fc522a5b88ddccecce807187b34c423831a94a6659e016aa5ded61bfaceeeeacbca61ea44a8c571eb4a8f7c1");
console.log(result)

console打印结果如下：

2、Python版本算法还原

class AESUtil(object):
    """
    算法：AES
    模式：CBC
    补全算法：PKCS7
    """


    def __init__(self, key: str, iv: str, block_size=AES.block_size):
        self.key = key.encode("utf-8") if (key and isinstance(key, str)) else key
        self.iv = iv.encode("utf-8") if (iv and isinstance(iv, str)) else iv
        self.mode = AES.MODE_CBC
        self.block_size = block_size


    def _unpad(self, text: bytes) -> str:
        return text[:-ord(text[len(text) - 1:])].decode('utf-8')


    def decrypt(self, text: str) -> str:
        text = bytearray.fromhex(text)
        data = base64.b64encode(text)
        _text = base64.b64decode(data)
        cipher = AES.new(self.key, self.mode, self.iv)
        return self._unpad(cipher.decrypt(_text))




if __name__ == '__main__':
    h = 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eb83e841bf7c29026ad4ee23404968b244c8b0f9d0af0f08f3bab62a045e0ac56a284e1da7d825b9f8b5147529a6ed4dff1e18191ec553f04945e75c66d4b7554727b6455ec1b6ee5fc522a5b88ddccecce807187b34c423831a94a6659e016aa5ded61bfaceeeeacbca61ea44a8c571eb4a8f7c1"
    aes = AESUtil(key="jo8j9wGw%6HbxfFn", iv="0123456789ABCDEF")
    print(aes.decrypt(h))

打印结果如下：

五、总结分享

回顾整个分析流程，本次难点主要概括为以下几点：

• 如何快速定位加密参数的位置
• 对AES CBC模式算法有所了解
• 能够还原JS代码并能运行
• 能够通过Python还原加密算法
• 对数据类型之间互相转换有深刻认识

本篇分享到这里就结束了，欢迎大家关注下一期，我们不见不散☀️☀️