"Almost 500,000 people have been caught out by a booby-trapped media file, says security firm McAfee.
The fake file poses as a music track, short video or movie and has been widely seeded on file-sharing networks to snare victims.
Anyone downloading the trojan and trying to run it is asked to install a codec that will play the supposed media.
In the last seven days McAfee said the trojan had been found on more than 500,000 of the PCs that notify the company when a malicious file is downloaded.
Just for good measure, here's a Girls Aloud video for evidence. Ha, can't speak French! Who cares if the lad is H-O-T, right birds?