What causes mac cleaner malware

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I reset my Laptop to factory setting but kept my personal files (mostly games) and my CPU was back to 44-55 Degrees Celsius while idle but still reaches about 80-95 Degrees Celsius when playing game. Tried to make an account here in the forums but was unsuccessful due to some error, but I managed to making one while on work. This raised my suspicion that it might be a cryptominer so I scanned my system using Malwarebytes, Adware Cleaner, and FRST but found no malware. At first i thought the fans just needs some cleaning so I cleaned the dust from the fans and reapplied thermal paste then bought a cooling pad but I only managed to reduce the temperate by 3 Degrees Celsius on average. I deleted the file but the symptoms persists. I forced restarted my laptop.Third restart the stuttering and freezing was gone but this is where i noticed that my Laptops fans are flaring out louder than usual and saw that my CPU temp is reaching 80-90 Degrees Celsius on idle. I was playing the game Warframe on Steam and as suddenly i experiencing FPS drops till it froze then i tried force exiting the game and opening the Task Manager but I was unable to open them. I suspect that i may have a Malware in my system, I may have been infected 20 days ago from a downloaded file since i noticed the initial suspicious symptoms during that period.