Ransomware is a computer program which is specially designed to restrict access to files and data of a particular system when gets into it. Currently Ransomware (alias: Cryptolocker or Locky) is the most popular attacks which are infecting computer system around the world at an increasing rate. Ransomware enters a system through email attachment from trusted domains. Ransomware Removal Tool is still not possible to develop. When the user opens the attachment, it gets into the computer system and executes an encryption program which starts encrypting the data files on the system with a unique encryption key using various algorithms like RSA.