Security analysts have detected a new piece of malware that appears to run as a Microsoft program used to detect unlicensed versions of its operating system.  

The malware has been classified as a worm and spreads through AOL's Instant Messenger program, said Graham Cluley, senior technology consultant for Sophos  PLC, a security vendor.
Sophos is calling it W32/Cuebot-K  a new variation in the Cuebot family of malware. Aliases Backdoor.Win32.IRCBot.st
Win32/IRCBot.OO

Cuebot-K can disable other software, shut off the Windows firewall, download new malicious programs, perform basic DDOS (distributed denial of service) attacks, scan local files and spawn a command prompt, Sophos said.

Article here

Information on AIM Viruses/Worms at jayloden.com