Lyceum is an advance stealthed client/server backdoor that uses encrypted spoofed UDP packets to administer the server and the two built-in ICMP backdoors. Each ICMP backdoor exploits a different feature of the protocol, the first creating a bi-directionally spoofed ICMP tunnel and the second uses passive nodes as zombies to relay ICMP backdoor traffic.
You can download it from the following link: https://packetstormsecurity.com/files/download/33861/lyceum-2.46.tar.gz
Source: https://packetstormsecurity.com/files/33861/lyceum-2.46.tar.gz.html