The ransomware targets 242 file types for encryption. When it first infects a computer, the OpenToYou ransomware will create a password string, use SHA-1 to derive an encryption key from the password, which it then uses to encrypt the victim’s files with the RC4 algorithm. The ransomware’s name comes from the email address at which the crook wants victims to reach out ( ), and by the file extension appended to each encrypted file ( ). Emsisoft CTO/researcher Fabian Wosar has created a decrypter for the newly discovered OpenToYou ransomware that will allow infected victims to recover encrypted files without needing to pay a ransom.
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