Superkit is an extremely user-friendly rootkit that hides files, processes, and connections. It provides a password protected remote access connect-back shell initiated by a spoofed packet. It is loaded via /dev/kmem, without support for loadable modules required, and cannot be detected by checking the syscall table, because it redirects the kernel entry point to a private copy of the syscall table. A couple of backdoors are included.
You can download it from the following link: https://packetstormsecurity.com/files/download/32191/superkit.tar.gz
Source: https://packetstormsecurity.com/files/32191/superkit.tar.gz.html