SymbOS.Doomboot.R is a Trojan horse that installs corrupt files on the compromised device preventing it from restarting correctly. The Trojan runs on the Symbian OS, which is the operating system for Nokia Series 60 cellular telephones.
The Trojan reportedly arrives as F-secure Antivirus.sis. When the 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:
- If Bluetooth is not required, it should be turned off.
- If you require the use of Bluetooth, ensure that the device's visibility setting is set to "Hidden" so that it can not be scanned by other Bluetooth devices.
- 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.