F-Secure Trojan Information Pages : RommWar.D
SymbOS/RommWar.D is a malicious SIS trojan that installs a malfunctioning system component that can cause different behaviours depending on the ROM software version in the device. Different effects witnessed range from the freezing of the device requiring a restart, to disabling the power button on the device, or in some cases no apparent effect on device at all.
Manual Disinfection
Depending on the effect caused by SymbOS/RommWar.D, removal of the malfunctioning components might be possible by going to the application manager and uninstalling the SIS file in which SymbOS/RommWar.D arrived.
Disinfection for the cases when phone cannot start up
CAUTION! this method will remove all data on the device including the calendar and phone numbers: - Power off the phone
- Hold the following three buttons down - "answer call" + "*" + "3"
- Keep holding down the buttons and power on the phone
- Depending on the model, you will either get text that reads "formatting" or a start-up dialog that asks for the initial phone settings
- Your phone is now formatted and can be used again
Installation to System
SymbOS/RommWar.D installs a malfunctioning system binary into the C: drive of the phone and a bootstrap component that executes the malfunctioning system binary. This is followed by different effects depending on the version of the ROM software on the device. Effects witnessed vary from the freezing of the device, to disabling of the power button, or sometimes no apparent effect at all.
SymbOS/RommWar.D also installs a trial version of Kaspersky Anti-Virus Mobile for S60 on the phone.
Payload
Installs a corrupted system binary and a bootstrap component.
F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 84.
Write-up: Mika Tolvanen, May 10, 2006
Technical Details: Mika Tolvanen, May 10, 2006
F-Secure Corporation
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