Trojan:SymbOS/Singlejump.I

Classification

Malware

Trojan

SymbOS

Singlejump.I

Summary

Singlejump.I (renamed Onehop.I) 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.I, it is critical not to reboot the phone. Singlejump.I sends also SymbOS/Onehop.B to the first device it finds with Bluetooth.

Removal

Disinfection with two Series 60 phones

Download F-Skulls tool from our FTP server to your computer or to a clean phone, then:

  • Install F-Skulls.sis into infected phones memory card with a clean phone
  • Put the memory card with F-Skulls into infected phone
  • Start up the infected phone. The application menu should work now
  • Press menu button until you get Symbian process menu, look for any applications with strange icons. Kill the application processes with 'C' button.
  • Go to application manager and uninstall the SIS file in which you installed the Singlejump.I
  • Download F-Secure Mobile Security and activate it
  • Scan the phone and remove any remaining components of Singlejump.I
  • 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

  • Power off the phone
  • Hold following three buttons down "answer call" + "*" + "3"
  • Keep holding the buttons and power on the phone
  • Depending on the model, you either get text "formatting" or startup dialog that asks for initial phone settings
  • 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: SC-CT_carcked_S60_BiNPDA.sis

Payload

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

Singlejump.I uses modified Cabir to spread other trojans. Instead of sending a copy of itself it loads SIS file installed by Singlejump.I and sends it to the first phone it finds within Bluetooth range. In most cases these trojans doesn't send themselves further.