FastWind ransomware is the files virus that relies on encrypting data, so money can be demanded from you directly

From 2-spyware.com

FastWind ransomware

FastWind ransomware – cryptovirus that makes files useless and locks them using .FastWind file marker, so the victim knows about the complete encoding procedure. Once that is done, malware creators can require money for the alleged unlocking that is needed to get any of the data back. The computer can get even further affected if the threat manages to access system folders, crucial system data, and make changes there. The threat triggers the encryption and uses a powerful army-grade algorithm that allows attackers to change the original code of an image, document, archive file, database, video, or audio type data. 

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