Trojan:SymbOS/Skulls.P

Classification

Malware

Trojan

SymbOS

Skulls.P, SymbOS/Skulls.P

Summary

Skulls.P is a combination of several previous Skulls variants. Skulls.P contains component files from Skulls.D and Skulls.N among other variants. Skulls.P also drops SymbOS/Mabir.A and several Cabir variants on the phone and component files from Fontal and Doomboot trojans. The Doomboot component dropped by Skulls.P prevents phone from rebooting, so if your phone is infected with Skulls.P, it is critical not to reboot the phone. As Skulls.P breaks the application manager and application installer, the only currently working method of disinfection works with phones that have removable memory card.

Removal

Disinfection with two Series 60 phones

CAUTION! This method will work only with phones where memory card can be inserted without removing the phone battery.

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

  • 1. Install F-Skulls.sis into infected phones memory card with a clean phone
  • 2. Put the memory card with F-Skulls into infected phone
  • 3. The F-Skulls starts automatically upon insertion and frees menu and application manager
  • 4. Go to application manager and uninstall the SIS file in which you installed the Skulls.P
  • 5. Download and install F-Secure Mobile Security onto your computer to remove other malware dropped by the Skulls.P, or download directly onto the mobile phone itself
  • 6. Remove the F-Skulls with application manager as the phone is now cleaned

Disinfection for the cases when phone is already rebooted and cannot start up

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

Sometimes Doomboot.F installs the corrupted file on memory card, so try to boot without the card. If the phone still does not boot use the instructions below.

  • 1. Power off the phone
  • 2. Hold following three buttons down "answer call" + "*" + "3"
  • 3. Keep holding the buttons and power on the phone
  • 4. Depending on the model, you either get text "formatting" or startup dialog that
  • asks for initial phone settings
  • 5. Your phone is now fomatted 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.

Find out more

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Spreading in: Doom_v1.5_with_Sound_MMC__by_NewLC.sis