Here you go first search on Google yeilded this. Here is one post from the thread:

Just a bit of background.....

This trojan horse is a Java program that is inserted into a web page and exploits a security vulnerability in Microsoft VM (Virtual machine) when someone views that web page. VM is what allows Java programs to run on Windows platforms. Microsoft issued a security alert about this in April 2003 and a patch to fix it was made available via 'Windows Update'. This patch will show up in Critical updates as Microsoft VM Security Update 816093.

To help protect your system against viruses, worms and trojans like this one it's a good idea to get into the habit of regularly running Windows update and installing recommended critical security updates as soon as possible.

This trojan can also infect a computer via email though if you use Outlook express, the latest versions would have automatically blocked this.

Common symptoms of this trojan are that your Internet Explorer home page is changed. It can also add pornographic websites to your favourites list or install dialler programs that try to dial in to pornographic websites.

Jon