The two reported Trojan programs for Series 60 (Cabir - which tries to send itself via Bluetooth to another Series 60 phone) and Skulls (which replace all the Desktop Icons with Skulls) have been programmed together. Skulls-B uses the Cabir Bluetooth transfer to send the Skulls payload. Some simple hints to avoid this - don't leave your phone's Bluetooth set to discoverable, and confirm any file you recieve over Bluetooth. And if you see an Icon called "Caribe" on your phone, don't run it.