BleepingComputer Review:

AuroraDecrypter is a ransomware decryptor created by Michael Gillespie that decrypts files encrypted by the Aurora Ransomware. Using this decryptor, victims can recover their files for free without having to pay a ransom.

More information about the Aurora Ransomware can be found at this url: Aurora / Zorro Ransomware Actively Being Distributed

For help using this decryptor, you can read the dedicated decryption guide here: How to Decrypt the Aurora Ransomware with AuroraDecrypter

This decryptor supports the following extensions for encrypted files:

.Nano
.animus
.Aurora
.desu
.ONI
.aurora