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A new ransomware campaign is exploiting Amazon Web Services’ (AWS) Server-Side Encryption with Customer Provided Keys (SSE-C) to encrypt S3 buckets. The attackers use encryption keys unknown to the victims and demand ransoms for the decryption keys. This attack abuses a legitimate AWS feature, creating a very difficult situation for its victims who cannot recover their data without the decryption key. The ransomware crew has been dubbed ‘Codefinger’.