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Warning about BOSniffer

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 "BoSniffer.zip" 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

This program, "BoSniffer.zip" 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
108573 BoSniffer.zip
MD5 fingerprints and strings (checksums)

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

Evidence that BoSniffer.zip is really BO Server with SpeakEasy Plugin:

sector 0x028C38
irc.lightning.net:7000:Hey MASTER where are u!!!

sector 0x0303F0 - sector 0x0306D8
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

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