The Italian Honey Project

[..] Our team found that these [mobile] Botnets  do one of two things; send messages to all the contacts of the address book directly, or send messages to the random phone numbers by connecting to a server. The viruses will delete the sent messages from the user’s Outbox and SMS log. All messages contain URLs linked to malicious sites that users won’t be able to see until after they’ve fallen into the virus trap.

The Botnets seem to be targeting Symbian S60 3rd and 5th generation operating systems, and our Mobile Security Center estimates 100,000 mobile phones were impacted by them![..]

via Botnet Viruses Captured by NetQin « Netqin’s blog.