Threat Descriptions

Trojan:SymbOS/Cardtrap.AF

Classification

Category :

Malware

Type :

Trojan

Platform :

SymbOS

Aliases :

Trojan:SymbOS/Cardtrap.AF

Summary

Trojan:SymbOS/Cardtrap.AF tries to disable system applications and third party products, and also installs additional malware onto the device.

Removal

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

Disinfection with two Series 60 phones

Use the F-Skulls utility to allow for installation of F-Secure Mobile Anti-Virus. Download the F-Skulls tool from ftp://ftp.f-secure.com/anti-virus/tools/f-skulls.zip or directly to a clean phone from https://www.f-secure.com/tools/f-skulls.sis.

  • 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 https://phoneav.com 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

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 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

Trojan:SymbOS/Cardtrap.AF affects devices running the Symbian S60 operating system. It is distributed in a malicious SIS file named 'BlueSoft Hacking Pro.sis' and when executed, tries to disable system applications and third party products. It also installs additional malware onto the device.

Execution

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

Cardtrap.AFalso installs files from the following Symbian-based malware:

  • Trojan:SymbOS/Blankfont.A
  • Trojan:SymbOS/Singlejump.A

It also installs following Windows malware:

  • W32/Generic.worm!p2p

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