本文共 27838 字，大约阅读时间需要 92 分钟。

题目

题目地址：

 

解题

单个页面的数据如下。

首先通过网络请求查看单个页面数据的获取方式。发现是从这个请求中拿到的数据，其中 sign 和 t 为需要逆向分析的字段。 追踪该请求调用栈即可看到关键位置。 如图，VM虚拟机已经将 sign 和 t 的生成方式“吐”出来了。 上面的代码是如何生成的呢？进入 crawler-javascript-obfuscation-1.js:1 查看，里面的内容让人蒙圈。 完整代码如下：

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这就是著名的 JSFuck 框架了，其原理参考下方js表达式。

回想一下js定义函数立即执行的写法：

(function fun(str){
       console.log(str);})("zyc")

如果把最后的括号 (“zyc”) 去掉后复制到控制台即可得到函数体：

同理我们把上面JSFuck混淆的代码也去掉最后的括号试试呢，复制混淆后的内容到 Visual Studio Code，光标定位到末尾 “)”，使用 Ctrl + Shift + \ 即可定位到另一边括号 “(”，将之前的内容复制到控制台查看。 既然前面的内容是 eval() 函数，那后面的应该就是函数体了。 sign 和 t 的生成方式也就拿到了。

let t = Math.floor(($('main .container').attr('t') - 99) / 99);let sign = sha1('Xr0Z-javascript-obfuscation-1' + t);

由于我这访问GlidedSky存在问题，而且加密参数已经拿到，后续的就暂时不写了。

 

参考资料

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