Tool : avast_decryptor_alcatrazlocker 
Use Type : Free To Use
Author Site :

Once ransomware encrypts/locks your files, then you need to decrypt them with available decryptor. Alcatraz Locker is a ransomware strain that was first seen around mid of November 2016. This strain uses AES 256 encryption combined with Base64 encoding for encrypting your files. Avast gave us solution. You can try out its decryptor available below.

(Link sends you to official download site)