"The Register reports on the first trojan using Sony's DRM rootkit. A newly
discovered variant of the Breplibot trojan makes use of the way Sony's
rootkit masks files whose filenames begin with '$sys$'. This means that any
files renamed this way by the trojan are effectively invisible to the
average user. The malware is distributed via an email supposedly from a
reputable business magazing requesting that the businessperson verify
his/her attached 'picture' to be used for an upcoming issue. Once the
payload is executed, the trojan then installs an IRC backdoor on affected
Windows systems."
http://www.theregister.co.uk/2005/11/10/sony_drm_trojan/
Imhotep