Back Orifice Remover is a Trojan

BoSniffer is Really a Trojan
Reported August 31, 1998 by Ken Williams on NTBugTraq


  • Windows machines infected with BackOrifice



I recently came across a program called "" that the author claims will "block key points in the registry from BO as well as search for existing installs of the backdoor."

Close examination has revealed that this is actually a BO server with the "SpeakEasy" plugin installed. If you run "BoSniffer.exe", the BoSniffer executable (read: BO Server Trojan w/ SpeakEasy) will "attempt to log into a predetermined IRC server on channel #BO_OWNED with a random username. It then proceeds to announce its IP address and a custom message every few minutes."

This program, "" is currently being widely distributed as a "cure for Back Orifice infections". It is probably being distributed with other software packages and with other names too. Listed below are relevant details about this program.

File Sizes (in bytes)
231068 BoSniffer.exe
MD5 fingerprints and strings (checksums)

MD5 ( = 2d75c4ac54b675778ff22f76f9a6a77f
MD5 ("string") = b45cffe084dd3d20d928bee85e7b0f21
MD5 (BoSniffer.exe) = 63748087b2e1598fcf34498b0295212e
MD5 ("string") = b45cffe084dd3d20d928bee85e7b0f21

Evidence that is really BO Server with SpeakEasy Plugin:

sector 0x028C38 MASTER where are u!!!

sector 0x0303F0 - sector 0x0306D8
BO ButtPlugs and goodies...
AJ Reznor: The pierced, tattooed grand master god of flame wars!
Who is John Galt?
Yes, you too can own my box with this special introductory offer of $0.00!
I"m sad to see Kontrol Faktory go away.
Use Linux!
This box is now property of the Illuminati.
<<tap>> <<tap>> <<tap>>...Is this thing on?
Where do *YOU* want to go today?!

sector 0x031848

sector 0x0318A8 - sector 0x031980
#BO_OWNED with IRC commands:
Own Me @ .NOTICE .JOIN #BO_OWNED host server :Owned USERNICK BO
.QUIT Psssst...Speakeasy was told to shut down
.NOTICE #BO_OWNED :Psssst...Speakeasy just started up

You get the idea by now, hopefully.


REMOVE BACKORIFICE MANUALLY !  Instructions on removing BO Servers from compromised servers can be found at:

To learn more about NT Security concerns, subscribe to NTSD

- Originally reported by Ken Williams
- Posted on The NT Shop on August 31, 1998
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