Trend is reporting a trojan horse that might be the first example of a new exploit developed from the November security updates issued by Microsoft. Please update your PC with the latest security updates offered by Microsoft, as more developments could follow.

Internet Storm Center: TROJ_EMFSPLOIT.A in the wild

Trend Link: TROJ_EMFSPLOIT.A in the wild

Trend Micro is reporting a trojan in the wild (TROJ_EMFSPLOIT.A) that is exploiting the recent MS05-053 vulnerability announced on Tuesday. The trojan causes EXPLORER.EXE to crash, which isn't so much fun for Windows users.

Upon execution, this Trojan causes the EXPLORER.EXE of affected machines to crash. It may also cause applications that attempt to load it to crash. An example of an application that can load EMF files is Internet Explorer. This Trojan runs on Windows 2000 Service Pack 4 and XP with no Service Pack.

Comments: While both the Internet Storm Center and Trend originally noted an MS05-053 based exploit, the actual EMF based trojan is instead closely related. Hopefully, no true MS05-053 exploits will surface. While we have time, Trend's modified analysis of this theat doesn't diminish the important of keeping Windows, Macromedia Flash, and every product installed as up-to-date as possible.

Source: Internet Storm Center revises TROJ_EMFSPLOIT.A analysis and notes that it is NOT related to MS05-053