Azureus Mass Mailer Alert

Hi, there.
The firewall works great, as far as I know, 'cept for one minor annoyance-once in a while, it will put out an alert in a form of a pop-up window whic hstates something about a “mass mailer worm”, and points an accusotory electronic digit at Azureus( a bit-torrent client). I am not sure how to treat that, has anyne encountered a similar problem? Last scan of my PC revealed nothing out of the ordinary.

What antivirus do you use and what did you scan with?