The Cisum.A worm is a virus with a twist. Once a machine is infected it displays a message to the user with the text “YOU ARE AN IDIOT”
and repeatedly plays an audio track with the same message every 5 seconds. Beyond the obvious cracks at the intelligence of the system user Cisum also targets firewalls and Anti-Virus and shuts them down. On the plus side this worm looks for instances of the Netsky and Bagle that may be present.
Cisum seems to be designed to spread primarily by copying itself to network shares and mapped drives
Cisum effects Windows 2003, XP, 2000, NT, ME, 98 and 95
Panda Software has the MP3 Cisum plays on thier site at here
Links to more info