Trojan Horse Attacks Windows Days After Fix

Trend Micro says they have discovered a trojan horse that attacks the Windows operating system through an image rendering vulnerability that was patched with last Tuesday's update.

The security firm first said the Trojan, called 'emfsploit.a', crashes 'explorer.exe' on unpatched Windows machines.

"Our Trend Labs team is currently working with Microsoft to resolve whether Troj_emfsploit.A does indeed fall under the category of code exploiting the MS05-053 vulnerability, or whether it is only a related piece of code but not totally exploiting MS05-053", Trend Micro representatives said in a statement.

This particular virus has been discovered in Japan, but so far there are no indications of infection anywhere else in the world. This is a low risk virus, but what concerns experts is that it was developed so quickly, only 48 hours after the Microsoft Windows Update was released.