A newly-uncovered worm called W32.Deletemusic does exactly what its name implies—it goes through a PC and deletes all MP3 files in sight. And that's it. Simultaneously low-threat and highly annoying, the worm makes its way from computer to computer by spreading itself onto all attached drives of a given PC, including flash drives and removable media. If that media is then removed and inserted into another computer, it continues its music-eating rampage on the new host.
more info :
http://www.symantec.com/security_res...123-99&tabid=1
http://arstechnica.com/news.ars/post...ng-trojan.html