A recent success story involving recovering data from the Akira ransomware without paying the ransom is detailed, including the source code used in the process. Multiple versions of the Akira ransomware are circulating, with the encountered variant active from late 2023. The ransomware presents challenges such as encryption relying on four moments with nanosecond resolution and complex key generation. The code is written in C++ and involves 1,500 rounds of SHA-256 for each timestamp. In-depth analysis and steps to tackle the decryption process, analyzing timestamps, and identifying plaintext are discussed, showcasing a methodical and technical approach to overcoming cybersecurity challenges.
https://tinyhack.com/2025/03/13/decrypting-encrypted-files-from-akira-ransomware-linux-esxi-variant-2024-using-a-bunch-of-gpus/