Beast is a Windows-based backdoor trojan horse, more commonly known in the underground hacking community as a Remote Administration Tool or RAT. It is capable of infecting versions of Windows from 95 to XP. Written in Delphi and released first by its author Tataye in 2002, it became quite popular due to its unique features. It used the typical client–server model where the client would be under operation by the attacker and the server is what would infect the victim. Beast was one of the first trojans to feature a reverse connection to its victims, and once established it gave the attacker complete control over the infected computer. It mainly targeted three infection sites: