IMHO this virus is long overdue. Some info on this: It's a vulnerability in the windows system itself b/c it comes in through Port 135. The exploit has been known for over a month now, all's you have to do is update windows, which you really should b/c if you leave yourself open to this, you'd be silly. It automatically scans for IP address, presumed random at this moment, and looks for Port 135 to enter. It was made to make a DDOS attack on microsoft's update page on the 16th of August I believe. It add's a new registry key to your computer and boots itself up. Filename is msblast.exe . It's a worm based on dcom.c (the vulnerability is that itself and NEEDS to be updated). Also this can be used to take over your system, people can send a trojan and completely exploit/takeover your system without having to do any background work except knowing that you run Win 2000, NT, and XP. Earlier versions of window's are not affected. Thankfully this worm is not coded very well (seems to have been a rush job on someone's part) and does no malicious damage as of yet. Though on the 16th things could get very interesting.
So in short: UPDATE your windows system or else someone can remotely administrate your computer and do nasty things to it or other computers that will get you in trouble. EDIT: oops thats wrong up there, its not the Port that is the vulnerablity it is RPC DCOM. sorry bout that.