F-Secure Trojan Information Pages : Bootton.F [ Summary ] | [ Disinfection ] | [ Detailed Description ] | [ Detection ] Name: Bootton.F Category: Trojan Platform: SymbOS Date of Discovery: March 28, 2006 Summary Bootton.F is a SIS file that installs a small software component that resets the device. This component will be executed automatically after installation and at system start up. That causes the reboot to fail and leaves the phone in an unusable state. Disinfection CAUTION! This method will remove all data on the device including the calendar and phone numbers: Power off the phone Hold following three buttons down "answer call" + "*" + "3" Keep holding the buttons and power on the phone Depending on the model, you either get text "formatting" or start-up dialog that asks for initial phone settings Your phone is now formatted and can be used again Back to the Top Detailed Description In its structure, Bootton.F is quite similar to SymbOS/Bootton.E with the exception that instead of needing user action to reboot the phone it does so automatically after installation and at the phone's start up. Back to the Top Detection F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 44. Back to the Top Write-up: Mika Tolvanen, May 10, 2006 Technical Details: Mika Tolvanen, May 10, 2006 F-Secure Corporation