Avaddon ransomware fixes flaw allowing free decryption

The Avaddon ransomware gang has fixed a bug that let victims recover their files without paying the ransom. The flaw came to light after a security researcher exploited it to create a decryptor.

On Tuesday, Javier Yuste, a Ph.D. student at Rey Juan Carlos University, published a decryptor for the Avaddon Ransomware on his GitHub page and released a report describing the flaw through ArXiv.

According to Yuste’s research, when the Avaddon ransomware encrypts a device, it creates a unique AES256 encryption session key used to encrypt and decrypt the files.

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Source: Bleeping Xomputer