Threat Descriptions



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SymbOS/CommDropper.J is a SIS file trojan that drops SymbOS/Commwarrior.E onto the 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 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

For representative examples of variants in the Commwarrior family, please see the descriptions below:

Many of the variants in this family are closely related. For example, variant Commwarrior.E is closely related to Commwarrior.C

Propagation (Bluetooth)

When replicating over Bluetooth, the worm uses the device's native Bluetooth functionality to search for other Bluetooth-discoverable devices within the Bluetooth wireless range. The worm then attempts to send infected SIS files to the discovered devices.

The SIS files Commwarrior transmits are randomly named so that phone users cannot be warned to avoid files with any particular given name.

Propagation (MMS)

When replicating over MMS, Commwarrior sends out MMS messages containing the infected SIS file. On opening the MMS message, the recipient then becomes infected.

Based on the variant, Commwarrior may send an infected MMS message to all users listed in an infected phone's contact book; to anyone who sends a message to the infected user; or to anyone the infected user contacts.