Files with evillock suffix can be typically found as user files that have been encrypted and had their extension renamed by variant of Evil-JS ransomware.
EVILLOCK file extension - Evil-JS (variant) ransomware affected file
What is evillock file? How to open evillock files?
File type specification:
File extension evillock appears to be mainly related to a variant of the infamous Evil-JS ransomware. This particular variant appeared January 25th 2017 and works pretty much like its predecessors, encrypts users files, renames the suffix and demands ransom.