A new piece of ransomware called Syrk will encrypt files on your hard drive while deleting entire folders if the ransom is not paid. The malware is based on the open source Hidden-Cry program, an encryptor that appeared online last December and has been the basis for many bits of malware over the past year.
https://www.coindesk.com/new-ransomware-targets-fortnite-playersNot the first time a ransomware or a crypto-stealing malware spreads through fake cheating programs for online games, I remember similar thing being reported about Hearthstone in the past, and there's probably many more examples if you search for it. This should serve as a powerful lesson to anyone who got affected that downloading and running programs from unverified sources is a big no-no.