SymbOS.Cardtrp.J is a Trojan horse that runs on the Symbian OS, which is used as the operating system for Nokia Series 60 cellular telephones.
It disables some applications installed on the device and drops threats onto the device's memory card, which can compromise computers running Windows.
The Trojan reportedly arrives as Digital_Image_Plus.sis. When user clicks on the .sis file, the phone installer will display a dialog to warn users that the application may be coming from an untrusted source and may cause potential problems.
Symantec recommends the following to protect against this threat:
- Avoid use of device pairing. If it must be used, ensure that all paired devices are set to "Unauthorized". This requires each connection request to be authorized by the user.
- Do not accept unsigned applications (no digital signature) or applications sent from unknown sources. Be absolutely sure of the origin of the application before accepting it.
Click for a more detailed description of Rapid Release and Daily Certified virus definitions.