sony have been putting software ( called xcp ) on some of their audio cds.
if you play these cds on your pc it automaticallyinstalls software on your pc.
this software uses "rootkit" to hide the file from the user.

here is a list of cds with the xcp software.

the software limits listeners' ability to copy the music onto their computers, and locks copied files so they cannot be freely distributed over the Internet.
it also also secretly communicates with sony over the internet when listeners play the discs.
hackers must have looked at this and redesigned the xcp code to communicate other secret data to the hacker from the users pc , like bank details etc.
it looks as though sony and first 4 internet ( the software writers ) might be facing a big law suit over this one.