The Antivirus Guy Blog

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Panda Software – WMFMaker – WMF virus construction tool

I am sure we all new that this was on the way, too bad all the script kiddies are back in school.

Panda Software – WMFMaker.

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/Me/98 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.

Currently, Microsoft has not released any security patch regarding the vulnerability, but their Security Advisory 912840 deals with the vulnerability.

As temporary measures, it is recommendable to:

  • Read emails in plain text.
  • Do not click on links received via email or instant messaging programs and sent by unknown senders.
  • If you have a Windows XP computer, enable DEP (Data Execution Prevention).
Visible Symptoms
WMFMaker is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.

January 3, 2006 - Posted by | Antivirus News, Security News

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