iPhone Worms Move From Harmless (Rickroll) to Nasty (Stolen Bank Info)

It started off innocently enough, with a Rickroll—when the first iPhone worm turned up in Australia two weeks ago, it changed its victim's wallpaper to a portrait of "Never Gonna Give You Up" signer/Internet sensation Rick Astley. But now iPhone worms have turned malicious. But by this week, some iPhones were victimized by the "Duh" worm, which steals personal banking info. Like the rickrolling original, the new malicious code targets only jailbroken iPhones—those on which that the owner has circumvented the Apple operating system to hack the phone.