TROJ_WMFCRASH.B

This Trojan is a .WMF file that takes advantage of an unpatched vulnerability found in Windows Picture and Fax Viewer. It runs on Windows XP and Server 2003, and is currently spreading in-the-wild.

The Windows Picture and Fax Viewer vulnerability is a zero-day exploit that is
capable of remote code execution. Zero-day exploits are thus named because the unpatched vulnerability and its corresponding exploit code are released within the same day. This may leave systems vulnerable, due to the availability of exploit code, and the fact that the vendor has not been given enough time to patch it.

Once this malicious .WMF file is opened, it proceeds to launch a denial of service attack in an attempt to restart or terminate the legitimate system process EXPLORER.EXE. The said action leaves an affected user unable to navigate through Windows.

After performing its routine, this Trojan terminates itself.