Threat Description



Aliases: Trojan:​SymbOS/Fontal.G
Category: Malware
Type: Trojan
Platform: SymbOS


Also known as a trojan horse program, this is a deceptive program that performs additional actions without the user's knowledge or permission. It does not replicate.


Automatic Disinfection

F-Secure Mobile Anti-Virus will detect Fontal.G and delete the trojan's components.

1. Open web browser on the phone

2. Go to

3. Select link "Download F-Secure Mobile Anti-Virus" and then select phone model

4. Download the file and select open after download

5. Install F-Secure Mobile Anti-Virus

6. Go to applications menu and start Anti-Virus

7. Activate Anti-Virus and scan all files


After disinfecting your phone, you can remove remaining empty directories by going to the application manager and uninstalling the SIS file in which Fontal.G arrived (Nokia Anti-Virus.sis).

Disinfection for cases where 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 formatted and can be used again

Technical Details

Trojan:SymbOS/Fontal.G is distributed in a malicious SIS file named 'Nokia Anti-Virus.sis' and claims to be Nokia Anti-Virus for Symbian devices. During installation, Fontal.G will show the following installation text:

Nokia Anti-Virus keep your phone protected from mobile virus. Please restart your phone after installation complete to activate your anti-virus product. If you found any problem regarding this software, please call :

If a phone is infected with Fontal.G, it must not be rebooted as the trojan will prevent the phone from booting again. If the phone is rebooted, it will try to boot, but will be forever stuck on phone startup and cannot be used.


When the Fontal.G SIS file is installed the installer copies files into following locations:

  • \system\apps\KAS
  • \system\apps\KAS\b.dat
  • \system\apps\KAS\Engine.exe
  • \system\apps\KAS\KAS
  • \system\apps\KAS\KaS.aif
  • \system\apps\KAS\KAS.r01
  • \system\apps\KAS\KAS_caption.r01
  • \system\apps\KAS\klnotify.rsc
  • \system\apps\KAS\limages.mbm
  • \system\apps\KAS\
  • \system\apps\KAS\lnotify.mbm
  • \system\apps\KAS\s.mid
  • \system\help\KasAntivirusHelp.hlp
  • \system\libs\kasdll.dll
  • \system\recogs\kas_antivirus.mdl
  • \system\Fonts\Kaspersky


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