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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

WMFMaker

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:WMFMaker
Technical name:Constructor/WMFMaker
Threat level:Low
Type:Security Risk
Subtype: Virus Constructor
Effects:  

It allows WMF images to be created that exploit the Graphics Rendering Engine vulnerability, which allows executable files to be run on the vulnerable computer.

Affected platforms:

Windows 2003/XP/2000/NT/ME/98

First detected on:Jan. 2, 2006
Detection updated on:Feb. 5, 2008
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

WMFMaker is a virus constructor, which allows images to be created in WMF (Windows MetaFile) format that exploit a critical vulnerability in the Graphics Rendering Engine on Windows 2003/XP/2000 computers. This vulnerability affects the library GDI32.DLL, which is used by the Windows Picture and Fax Viewer, Internet Explorer and Outlook, among other programs.

WMFMaker can be used to create images that run any type of malicious code on the affected computer, such as Trojans, worms or any other type of malware.

These malicious WMF images are then distributed using several methods: they can be hosted in a malicious website, sent via email, etc. When such a specially crafted WMF image is opened in a vulnerable computer, the code included within is executed, thus compromising the computer.

 

If you have a Windows 2003/XP/2000 computer, it is recommendable to download and apply the security patch referred to the Graphics Rendering Engine vulnerability, which is included in the security bulletin MS06-001. Access the web page for downloading the patch.

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Visible Symptoms 

    

WMFMaker is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.