Win95, Win98, WinMe, WinVista, Win2k, Windows Server 2008, Windows 7, WinSer2003, WinNT, Windows 8, WinXP
SONAR.Cryptlck!g108 is a heuristic detection that is designed to detect known variants of the Ransom.Cryptolocker family of threats.
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https://www.symantec.com/security_response/writeup.jsp?docid=2017-012408-3232-99
Disable System Restore (Windows Me/XP). Update the virus definitions of your antivirus product. Run a full system scan.