Rule:

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Sid:
153

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Summary:
Donald Dick is a Trojan Horse allowing the attacker to access various 
resources on the victim host. This event is generated when the attackers
client connects to the Trojan server.

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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:
This Trojan affects the following operating systems:

	Windows 95
	Windows 98
	Windows NT

The Trojan changes system registry settings to add the Donald Dick 
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.

The default name of the server application is vmldir.vxd.

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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\system\CurrentControlSet\Services\VxD\

Registry keys added:

	VMLDR

This contains the key StaticVxD = "vmldir.vxd"

Delete the registry key VMLDR.

Delete the Troajn application vmldir.vxd.

A reboot of the infected machine is needed.

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Contributors:
Original rule written by unknown persons.
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

Hackfix
http://www.hackfix.org/miscfix/dd.shtml

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