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F-Secure Trojan Information Pages: Commdropper.H

[Summary] | [Disinfection] | [Detailed Description] | [Detection]

Name:Commdropper.H
Type:Trojan
Category:Trojan
Platform:SymbOS
Date of Discovery:June 19, 2006

Summary
SymbOS/CommDropper.H is a SIS file trojan that drops SymbOS/Commwarrior.G onto the device.

CommDropper.H installs a damaged system component from SymbOS/Doomboot.M, which causes the device malfunction when rebooted. So if you have installed Commdropper.H it is important not to reboot your device before disinfection occurs.
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Disinfection

For disinfection instructions, please see the family description of SymbOS/CommDropper.

Disinfection for the cases when phone is already rebooted and cannot start up

CAUTION! this method will remove all data on the device including calendar and phone numbers

  1. Power off the phone
  2. Hold following three buttons down "answer call" + "*" + "3"
  3. Keep holding the buttons and power on the phone
  4. Depending on the model, you either get text "formatting" or startup dialog that asks for initial phone settings
  5. Your phone is now fomatted and can be used again
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Detailed Description
Please see the description of SymbOS/CommDropper for additional details.
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Detection

F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 28.
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