The F-Secure team has posted about a new worm capable of spreading across multiple platforms. The cross-platform worm is capable (theoretically) of spreading from a PC to a mobile device and back.
According to the company, the "Mobler" worm moves between Symbian and Windows platforms. It can cause some trouble on a Windows PC, but it seem to be harmless on the the Symbian device. It just copies itself to the memory card and tries to trick the user into infecting his PC.
Even though it's classified as a worm, the malware does not have an automatic spreading mechanism. The program creates a Symbian installation package that inserts a Windows executable on the mobile device's memory card. This executable is visible as a system folder in Windows Explorer - so it's possible for the user to accidentally open it and infect their PC while browsing the memory card's files.