Rkit-1.01.tgz – RKit is a Linux LKM backdoor/rootkit which intercepts the SYS_setuid call and ups a specified UID to 0 when that user logs in thereby successfully (and covertly) backdooring the root account.

RKit is a Linux LKM backdoor/rootkit which intercepts the SYS_setuid call and ups a specified UID to 0 when that user logs in thereby successfully (and covertly) backdooring the root account.

You can download it from the following link: https://packetstormsecurity.com/files/download/24466/Rkit-1.01.tgz

Source: https://packetstormsecurity.com/files/24466/Rkit-1.01.tgz.html