Sony BMG announced that they will be temporarily suspending the production of CDs containing the First4InternetXCP content protection. Why you may ask? Well they tried to stop the hax0rs of the world from stealing music, so the hax0rs used Sony's technology to exploit a Trojan virus. Touch Sony!
The technology employed by Sony to protect its music from illegitimate use was picked up by security software as a rootkit which hid files from Windows and made them impossible to detect. But simply using letters '$sys$' in a filename means that any such file will be hidden, even malicious files. And this is exactly what has happened with the latest virus.
Sony has distributed a patch to all anti-virus manufacturers to protect against this specific type of virus, so update those definitions kids and don t let the man get you down.