A new ransomware called RektLocker was discovered by Michael Gillespie that is based on the HiddenTear source code released by Utku Sen. When installed it will encrypt files using AES encryption and then append the .rekt extension to them. It will also create a ransom note called Readme.txt that contains the bitcoin address that a payment should be sent to.
Strangely, there is no method to contact the developer after payment is made. Therefore, there would be no way to decrypt encrypted files.