The *REAL* Info......

John A. Quayle blueoval at SGI.NET
Wed Jul 28 00:53:24 MDT 1999

Name: Back Orifice
Alias: BO, CDC-BO, BOSERVE, BOCLIENT, Orifice.srv, Orifice.addon, Hacktool

There is no virus by this name. However, there is a toolkit from a hacker
group Cult of the Dead Cow by this name.

This trojan horse allows an intruder to monitor and tamper with Windows 95
and Windows 98 computers over the Internet. There is no easy way for a
computer user to know the attack is taking place, and there is no easy way
to stop the attack once Back Orifice has installed itself on the computer.

In a typical attack, the intruder sends the Back Orifice trojan horse to
his victim as a program attached to e-mail. When the e-mail recipient
executes the program attachment, the trojan horse opens connections from
the computer to the Internet. This allows the intruder to control the
computer. The trojan horse is invisible and will restart itself
automatically even if Windows is re-booted.

Back Orifice allows a hacker to view and modify any files on the hacked
computer. It can create a log file of the computer users actions. It can
take screen shots of the computer screen and send them back to the hacker.
Or it can simply crash the computer.

F-Secure Anti-Virus detects and disinfects this trojan as Trojan.Win32.BO.

To manually remove Back Orifice, restart the machine in MS-DOS mode
(Start/Shut Down/Restart in MS-DOS mode) and delete the BO server from
Windows system directory. Usually this can be done by typing in the DOS


Alias: BOSniffer

This is a trojan which claims to detect Back Orifice, while in fact it is
Back Orifice server itself. It is detected as Trojan.Win32.BO.b.

See: Netbus

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