Reptile is a Linux kernel module rootkit that hides files, processes, etc. It implements ICMP/UDP/TCP port-knocking backdoors, supports kernels 2.6.x/3.x/4.x, and more.
You can download it from the following link: https://packetstormsecurity.com/files/download/147919/Reptile-master.zip
Source: https://packetstormsecurity.com/files/147919/Reptile-LKM-Rootkit.html