Threat Descriptions

Trojan:SymbOS/Cardtrap.AA

Classification

Category :

Malware

Type :

Trojan

Platform :

SymbOS

Aliases :

Trojan:SymbOS/Cardtrap.AA

Summary

Trojan:SymbOS/Cardtrap.AA attempts to key system applications and third party products by installing several damaged files to the phone memory.

Removal

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

The trojan is distributed in a malicious SIS file with the name 'The Two Thrones-GAMELOFT.sis'. It is also able to install a worm on the phone's Multimedia Card (MMC).

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

Execution

On execution, Cardtrap.AA installs files from following Symbian malware:

  • SymbOS/Skulls.A
  • SymbOS/Blankfont.A

and tries to disable following system applications:

  • Application installer
  • Application manager
  • Browser
  • File manager
  • Bluetooth manager

The trojan also drops the following malware to device C: drive:

  • Trojan.BAT.KillAV.cg
  • Trojan-Dropper.Win32.QuickBatch.e

Payload

Cardtrap.AA installs following Windows malware:

  • Email-Worm.BAT.BWG.d

to the phone MMC card. The worm is installed with filename, icon and shortcut link that tries to fool user into clicking them.

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