New PUBG Ransomware requires you to play the game called PlayerUnknown’s Battlegrounds to decrypt your files. The ransomware is not too advanced as it only looks for the process name and does not check for other information to confirm that the game is actually being played. The first method that can be used to decrypt the files is to run a program called TslGame.exe. Even though the ransom note states you need to run it for 1 hour, you only need to use the program for 3 seconds.
Source: https://www.bleepingcomputer.com/news/security/pubg-ransomware-decrypts-your-files-if-you-play-playerunknowns-battlegrounds/