unit3.dcu definition, relationships, removal:

This is a part of a malicious parasite that violates user privacy and damages the compromised system. The unit3.dcu file can be used for different purposes depending on the related parasite's type, functionality and carried payload. Although unit3.dcu may not take any malicious actions by itself, it ensures that a parasite is working properly and therefore needs to be removed. DO NOT open, execute or edit unit3.dcu!
The unit3.dcu file is installed and used by Lizards Tail 1.1 and Project Mayhem 1.0.
In some cases a presence of unit3.dcu does not mean that your system is infected. The file may actually belong to some fully legitimate applications and therefore must stay intact. If you are in doubt, please scan the unit3.dcu file using you regular spyware remover or antivirus program.