The Aurora Ransomware is a Windows infection that encrypts your files and then demands a ransom in bitcoins in order to get the decryption key. This ransomware has had numerous variants released with the most active current one being the one that appends the Nano extension. To learn how to decrypt files encrypted by the Aurora ransomware, please use the guide below. The Aurora Decryptor has been created by Michael Gillespie and can be downloaded for free. In order to use the decryptor a victim just needs to have two encrypted files of a certain file type.
Source: https://www.bleepingcomputer.com/ransomware/decryptor/how-to-decrypt-the-aurora-ransomware-with-auroradecrypter/