This is related to a couple of viruses but the most recent is as mentioned, "W32/Sasser.worm.a". This attacks systems that have not been patched with a Microsoft security update for an Exploit in LASASS. Get the patch from the following link.
http://tinyurl.com/37grk
To manually remove this virus follow these steps:
1. Reboot the system into Safe Mode (hit the F8 key as soon as the Starting Windows text is displayed, choose Safe Mode.
2. Delete the file AVSERVE.EXE from your WINDOWS directory (typically c:\windows or c:\winnt)
3. Run "Regedit" to Delete the "avserve" value from:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
4. Reboot the system into Default Mode
To automatically remove the files download and run Stinger.exe from Network Associates:
http://vil.nai.com/vil/stinger/
Go to the following Microsoft link to learn how to protect your system.
http://tinyurl.com/n9fy