ESET provides an excellent analysis of Simplelocker, which is an Android based File-Encrypting and TOR-enabled Ransomware.  Cleaning and removal techniques are available for variants currently circulating

QUOTE: Our developers have created ESET Simplocker Decryptor, an easy-to-use tool to decrypt files that have been encrypted by Simplocker. To install the application, please download it from Virus Radar with your device or scan the QR code below. To install the app, you must allow installation from Unknown Sources (Settings -> Security -> Unknown Sources).