Trojan-Dropper:OSX/Revir.B
Summary
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.
Removal
The F-Secure security product will automatically remove the file.
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:
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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.
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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.
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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
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.
Activity
In the background, the malware will drop and execute a backdoor program (detected as Backdoor:OSX/Imuler.A):
- /tmp/host