Azazel is a userland rootkit written in C based off of the original LD_PRELOAD technique from Jynx rootkit. It is more robust and has additional features, and focuses heavily around anti-debugging and anti-detection. Features include log cleaning, pcap subversion, and more.
You can download it from the following link: https://packetstormsecurity.com/files/download/125240/azazel-master.zip
Source: https://packetstormsecurity.com/files/125240/Azazel-Userland-Rootkit.html