Back Orifice is a rootkit program designed to expose the security deficiencies of Microsoft's Windows operating systems. The program's name is inspired by the name of Microsoft's BackOffice product. Created by a group of hackers called the Cult of the Dead Cow, Back Orifice allows someone at one computer to control everything on another, remote computer running Windows. Back Orifice can sniff passwords, record keystrokes, access a desktop's file system and more, while remaining undetected.
Back Orifice 2000 (BO2K) allows access to Windows XP and Vista. BO2K has the same capabilities as Back Orifice. Added features in BO2K include cryptography for secure network administration and an extended plugin architecture for flexibility.