ButtMan backdoor (Buttman_TCP_Request)

About this signature or vulnerability

Proventia Network MFS, Proventia-G 1.1 and earlier, Proventia Network IDS, RealSecure Desktop Protector 3.6, Proventia Server IPS for Linux technology, Proventia Network IPS, Proventia Desktop, RealSecure Network, RealSecure Server Sensor, BlackICE Server Protection, Proventia Server IPS for Microsoft Windows technology, BlackICE PC Protection, BlackICE Agent for Server:

This signature detects a request on port 12624/TCP that may indicate a Buttman backdoor running on your network.


Default risk level

High risk vulnerability  High

Sensors that have this signature

Proventia Network MFS: XPU 1.6, Proventia-G 1.1 and earlier: XPU 22.8, Proventia Network IDS: XPU 22.8, RealSecure Desktop Protector 3.6: baseline, Proventia Server IPS for Linux technology: 1.0, Proventia Network IPS: 2.0, Proventia Desktop: 8.0.614.1, RealSecure Network: XPU 22.8, RealSecure Server Sensor: XPU 22.8, BlackICE Server Protection: 3.6.cpa, Proventia Server IPS for Microsoft Windows technology: 1.0.914.0, BlackICE PC Protection: 3.6cpa, BlackICE Agent for Server: 3.6eof, RealSecure Desktop: baseline

Systems affected

Microsoft Windows 95, Microsoft Windows NT: 4.0, Microsoft Windows 98, Microsoft Windows 2000, Microsoft Windows Me

Type

Suspicious Activity

Vulnerability description

ButtMan, also known as BM, Backdoor.Buttman, Backdoor.Tubma, Backdoor.BR, and Tubma is a backdoor Trojan affecting Microsoft Windows 95, 98, Me, NT, and 2000. ButtMan uses a client/server relationship, where the server component is installed on the victim's system and the remote attacker has control of the client. The server attempts to open a port to allow the client system to connect. This could allow a remote attacker to gain unauthorized access to the victim's system.

How to remove this vulnerability

Use an up-to-date antivirus program to determine if the target computer is host to a backdoor program. If the program detects a backdoor, follow instructions to disinfect and repair the computer.

References

Dark-e.com Web site
ButtMan
http://www.dark-e.com/archive/trojans/buttman/index.shtml

Simovits Consulting Web site
ButtMan
http://www.simovits.com/nyheter9902.html

ISS X-Force
ButtMan backdoor
http://www.iss.net/security_center/static/14107.php