Rule:

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Sid:
162

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Summary:
This event is generated when Trojan Horse activity is detected from the program Matrix.

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Impact:
Possible theft of data and control of the targeted machine leading to a compromise of all resources the machine is connected to.

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Detailed Information:
Matrix is a Trojan Horse offering the attacker the ability to upload files to, and download files from the victim host.

The Trojan changes system registry settings to add the Matrix server to programs normally started on boot. Due to the nature of this Trojan it is unlikely that the attacker's client IP address has been spoofed.

Matrix is based on the Girlfriend Trojan, see sid 145.

The default name of the server application is Wincfg.exe

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Affected Systems:
Windows 95
Windows 98
Windows ME
Windows NT
Windows 2000
Windows XP

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Attack Scenarios:
This Trojan may be delivered to the target in a number of ways. This event is indicative of an existing infection being activated. Initial compromise can be in the form of a Win32 installation program that may use the extension ".jpg" or ".bmp" when delivered via e-mail for example.

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Ease of Attack:
This is Trojan activity, the target machine may already be compromised. Updated virus definition files are essential in detecting this Trojan.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Edit the system registry to remove the extra keys or restore a previously known good copy of the registry.

Affected registry keys are:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\

Registry keys added 

Wincfg.exe ="<DRIVE>:\WINDOWS\Wincfg.exe"

A reboot of the infected machine is recommended.

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Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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