It’s been discovered that UnrealIRCd version 3.2.8.1 was backdoored.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/90617/unrealircd-backdoored.txt
Source: https://packetstormsecurity.com/files/90617/UnrealIRCd-3.2.8.1-Backdoored.html