Trojan:SymbOS/AppDisabler.V

Classification

Malware

Trojan

SymbOS

Trojan:SymbOS/AppDisabler.V, Trojan:SymbOS/AppDisabler.V

Summary

AppDisabler.V is a malicious SIS file trojan, which tries to disable a number of Symbian OS system and third party applications. In addition to disabling applications AppDisabler.V replaces the phone operator logo and background image.

Disinfection with two Series 60 phones

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

First, download the F-Skulls tool from our FTP server to your computer or directly to a clean phone. Then:

Install F-Secure Mobile Anti-Virus

  • 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 Security and activate it
  • 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

Disinfection for cases when phone cannot start up

CAUTION This method will remove all data on the device, including calendar and phone numbers.

  • Power off the phone
  • Hold the following three buttons down - "answer call" + "*" + "3"
  • Keep holding down the buttons and power on the phone
  • Depending on the model, you will either get text that reads "formatting" or a start-up dialog that asks for the initial phone settings
  • Your phone is now formatted and can be used again

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

For more Support

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User Guide

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Contact Support

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Installation to the System

When installed, AppDisabler.V will replace the main executable of several system and third party applications by overwriting their main executable file and replaces the operator logo and background image.

If any third party applications targeted by the trojan are installed on the device, then their main executable will be overwritten, and must be reinstalled to repair the damage.