An Internet worm, posing as an anti-virus update arriving in an email, is also using peer to peer (p2p) software to spread. The Merkur worm, aka W32.HLLW.Merkur@mm arrives in email form with the subject "Update your Anti-virus Software" and has an attachment named "Taskman.exe". The worm relies solely on the recipient being fooled into running the attachment to spread. Like similar worms that have used "social engineering" to lure in unsuspecting victims, the Merkur worm sends itself to everyone in the victims' address book when it is opened. The also worm deletes any multimedia files located in p2p file sharing directories. It targets share directories used by KaZaA, Bearshare and eDonkey software.