Jigsaw - Ransomware
The ransomware threatens to delete files every hour unless the victim pays the ransom. Victims are infected after being tricked into believing they are downloading fraudulent versions of various software. Variants of the malware also report the encrypted files will be sent to your contacts if the ransom is not paid. New variants of the ransomware continue to be discovered in 2018 and append a range of extensions to infected files including ".fun", ".CryptWalker", ".LolSec", and ".LOCKED_PAY."