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 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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