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:W32/NomadSnore is distributed as an auto-extracting WINRAR archive file that uses the extension ".scr". When launched, the contents of the NomadSnore archive file are unpacked by a WINRAR script into the %temp% folder.
Once the ransomware code is run, it searches for and encrypts files of various file types (e.g. *.jpeg, *.doc. *.mp4 etc.) on the affected machine using AES-128 encryption, with CTR as block mode. It then displays an image on the desktop containing a ransom demand (payable in Bitcoins) in return for the decryption key needed to restore the affected files.