File: 159.txt

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Rule:

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Sid:
159

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Summary:
This event is generated when an attempt is made to list files on a host infected with the NetMetro Trojan Horse.

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Impact:
Limited control of the target host.

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Detailed Information:
Due to the nature of this Trojan it is unlikely that the attacker's client IP address has been spoofed.

The server portion opens TCP port 5031 by default to establish a connection between client and server.

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

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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.

The Trojan server is named NMS.exe.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:

A reboot of the infected machine is recommended. The Trojan does not start automatically at boot time nor does it change any system registry settings.

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Contributors:
Original Rule Writer Max Vision <vision@whitehats.com>
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

Whitehats arachNIDS
http://www.whitehats.com/info/IDS79

Dark-e:
http://www.dark-e.com/archive/trojans/NetMetro/index.html

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