WinSer2003, Win2k, Win95, WinVista, WinXP, Windows Server 2008, Windows 8, Windows 7, Win98, WinNT, WinMe
SONAR.Cryptlck!g128 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=2017-012408-4213-99
Disable System Restore (Windows Me/XP). Update the virus definitions of your antivirus product. Run a full system scan.