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.
Source: Bleeping Xomputer