Threat description




Cardtrap.AG is a Symbian SIS file trojan that disables several of Symbian's built-in applications, tries to damage some third party applications, and installs Windows malware to the memory card.


Disinfection with two Series 60 phones

Use F-Skulls to allow for installation of F-Secure Mobile Anti-Virus. Install F-Secure Mobile Anti-Virus.

Download F-Skulls tool from or directly to a clean phone from

  • Install F-Skulls.sis onto the infected phone's memory card with a clean phone
  • Put the memory card with the F-Skulls tool into the infected phone
  • Start up the infected phone and the application installer should now work
  • Go to the application manager and uninstall the SIS file in which you installed the malware
  • Download F-Secure Mobile Anti-Virus from and activate the Anti-Virus
  • Scan the phone and remove any remaining components of the malware
  • Remove the F-Skulls tool with the application manager as the phone should now be clean

Technical Details

Installation to the phone

Cardtrap.AG tries to disable key system applications and third party products by installing several damaged files to the phone memory.

Cardtrap.AG installs files from the following Symbian malware:

  • SymbOS/Singlejump.A

F-Secure Mobile Anti-Virus is capable of detecting Cardtrap.AG with generic detection, so if the phone has functional Anti-Virus installed Cardtrap.AG is blocked before it can be installed.

Installation to the MMC card

Cardtrap.AG installs following Windows malware:

  • Trojan.BAT.Disabler.c

to the phone's MMC card. The malware is installed with a filename, icon, and shortcut link that tries to fool the user into clicking on them.


F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 92.

Detection Type: Symbian

Database: 92

Description Created: 2006-05-16 14:46:33.0

Description Last Modified: 2006-05-16 14:51:43.0

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