F-Secure reports that recently they’ve encountered a cross-platform worm that’s capable to spread from a PC to a mobile device and back. Theoretically, the “Mobler” worm moves between Symbian and Windows platforms. In the first case, not much damage is done – it just copies itself to the memory card and tries to trick the user to infect his PC. Once reached Windows platform, Mobler can be quite nasty.
Mobler doesn’t automatically copy itself from one platform to another – it just creates a Symbian installation package (SIS) which inserts a Windows executable file on the memory card. Mentioned Windows executable file is visible as a folder to the user and it is possible that he/she clicks on it, thus infecting its PC.
F-Secure concludes that Mobler doesn’t pose immediate risk to the mobile device users, but warns that its writers could be capable of “improving” it.