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.
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):