Trojan-Dropper:OSX/Revir.B, Trojan-Dropper:OSX/Revir.B


Trojan-Dropper:OSX/Revir.B drops and executes a backdoor program detected as Backdoor:OSX/Imuler.A, while camouflaging its activity by opening a JPG file to distract the user.

Automatic action

The F-Secure security product will automatically remove the file.

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


Find the latest advice in our Community.

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

Trojan-Dropper:OSX/Revir.B drops a JPG file in the /tmp folder, then opens it to distract the user from noticing any other ongoing activity.

Screenshot of a JPG file dropped by Trojan-Dropper:OSX/Revir.B.

Note that the JPG file in the screenshot above uses the name 'trojan.jpg'. The JPG file will actually use the same name as the trojan-dropper's binary file.


In the background, the malware will drop and execute a backdoor program (detected as Backdoor:OSX/Imuler.A):

  • /tmp/host