ButtMan backdoor (Buttman_TCP_Request)

About this signature or vulnerability

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

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, IBM Security Server Protection for Windows: 2.1.14.2400, IBM Security Server Protection for Windows: 1.0.914.0, Proventia-G 1.1 and earlier: XPU 22.8, Proventia Network IDS: XPU 22.8, Proventia Desktop: 8.0.614.1, BlackICE PC Protection: 3.6cpa, BlackICE Server Protection: 3.6.cpa, BlackICE Agent for Server: 3.6eof, RealSecure Network: XPU 22.8, RealSecure Server Sensor: XPU 22.8, RealSecure Desktop Protector 3.6: baseline, Proventia Network IPS: 2.0, RealSecure Desktop: baseline, Proventia Server IPS for Linux technology: 1.0, Virtual Server Protection for Vmware: 1.0

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