Spora Ransomware uses multiple levels of AES and RSA encryption to make sure you are never getting those files back, while providing a "professional" looking "recovery" site. More info below.
Post on Bleeping Computer: https://www.bleepingcomputer.com/news/security/spora-ransomware-works-offline-has-the-most-sophisticated-payment-site-as-of-yet/
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