Forget the Rick Astley of "Rickrolling" fame wallpaper exploit -- A new worm poses a far more serious threat to Jailbroken iPhone and iPod Touch devices.
Security firm, Sophos, wrote about the symptom:
When an infected device is hooked up to a WiFi connection, the worm can spread more quickly to more IP addresses than on a typical 3G connection. One symptom noted by security.nl is that battery life is very, very short when the device is connected to WiFi, because the worm is generating so much network activity.
Each infected device is assigned a unique ID number, which allows the attackers to further investigate a phone found to have interesting content. This could lead to significant data theft if a sensitive phone has been jailbroken.
If this isn't serious, I don't know what is.
If your jailbroken iPhone or iPod Touch is experiencing such symptom, you might want to restore the system back to Apple's most recent firmware update before it's too late. This is the only way to kill this worm as of the moment.