基于AWD比赛的蠕虫webshell(四)

合天网安实验室发布时间：2019-10-28 10:36:00 ，浏览量：0

蠕虫webshell虽然功能比较复杂，但是看懂了代码还是有机会进行防御和被他人利用的，还是有必要进行代码混淆的。

历史文章：蠕虫webshell代码功能详情：基于AWD比赛的蠕虫webshell蠕虫webshell复活框架：基于AWD比赛的蠕虫webshell(二)蠕虫webshell适配msf、前端传播与反渗透：基于AWD比赛的蠕虫webshell(三)

蠕虫webshell代码混淆

先说混淆后的效果，报1级变量函数，但考虑到蠕虫webshell是要每个php文件都要插入这么大段代码，大家都是做安全的明白人应该知道这个有问题，所以暂时达到混淆的目的，免杀就不多考虑了。

混淆后总体效果，仅只有1行代码：

混淆解释和原理：定义一个包含str_replace的字符串，加入混淆字符串mR3s，后面使用str_replace替换mR3s中间字符,就会剩下str_replace了，


    
        
        
        
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