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[Linux] 服务器疑似被入侵，怎么看这个文件执行了什么？

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今天上班发现公司网页无法访问，排查后发现是服务器 /var/log 被清空，导致 nginx 无法启动。

进一步排查发现 history和 last 被清空。被安装了 python3 ，npm
添加了两个 cron 任务 

@reboot /usr/bin/sshu > /dev/null 2>&1 & disown
@monthly /usr/bin/sshu > /dev/null 2>&1 & disown

sshu 文件地址_Github

新增了两个用户 bash 和 server

怎么看这个文件执行了什么？

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