Threat Descriptons



Category :


Type :


Platform :


Aliases :

Trojan:Android/OpFake, Trojan:Android/OpFake.A, Trojan:Android/OpFake.D, Trojan:SymbOS/OpFake.A, Trojan:SymbOS/OpFake.B, Trojan:WinCE/OpFake.A


Variants in the OpFake family send SMS messages to premium-rate numbers.


Once the scan is complete, the F-Secure security product will ask if you want to uninstall the file, move it to the quarantine or keep it installed on your device.

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 OpFake malware family include variants that operate on the Android, Symbian and Windows Mobile platforms. All variants essentially sends SMS messages to premium-rate numbers.

The first variant, OpFake.A is disguised as an Opera Mini web browser updater, to the extent of adding an Opera icon on the menu and displaying a fake download progress bar to make it appear that the application is actually downloading, and a fake license.

In addition to sending out SMS messages to premium-rate numbers, the malware also monitors SMS messages and is capable of deleting/moving messages based on the originating phone numbers and message content. Subsequent variants share similar technical details.

This malware is also discussed in the following Labs Weblog post:


  • Trojan:Android/OpFake.A
  • Trojan:Android/OpFake.D
  • Trojan:Android/OpFake.E
  • Trojan:Android/OpFake.F


This malware is discussed in further detail in:

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