A ransomware sufferer that paid Bitcoin BTC to unlock his information has enacted candy vengeance on his attackers, by hacking them proper again.

As a part of his retaliation, German programmer Tobias Frömel (aka “battleck”) launched virtually 3,000 decryption keys to help others hit by the Muhstik ransomware, alongside free decryption software program, BleepingComputer reviews.

The factor is, this revenge-hack wasn’t precisely authorized. Frömel highlighted this in his unique announcement on the BleepingComputer discussion board yesterday morning, however urged readers to know that he’s “not the dangerous man right here.”

The Muhstik ransomware hackers have plagued QNAP’s Community Connected Storage (NAS) gadgets for the reason that finish of September.

They’ve discovered success by brute-forcing their means into gadgets with weak passwords, encrypting information and demanding 0.09 BTC ($700) of their victims to unlock them.