Threat Descriptons



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Singlejump.J (renamed Onehop.J) is Symbian SIS file trojan that replaces system files and some 3rd party applications with corrupted binaries from SymbOS/Doomboot.A trojan. These components prevent phone from rebooting, so if your phone is infected with Singlejump.J, it is critical not to reboot the phone.

Singlejump.J sends also SymbOS/Onehop.B to the first device it finds with Bluetooth.


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

Spreading in: SC-PT_carcked_Ngage_DFT.sis


Singlejump.J replaces built in and third party applications with component that causes reboot to fail.

Singlejump.J use modified Cabir to spread other trojans. Instead of sending a copy of itself it loads SIS file installed by Singlejump.J and sends it to the first phone it finds within Bluetooth range.

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