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Ransomware is a type of malware that prevents or restricts user from accessing their system, either by locking the system's screen or by locking the users' files in the system unless a ransom is paid. More modern ransomware families, individually categorize as crypto-ransomware, encrypt certain file types on infected systems and forces users to pay the ransom through online payment methods to get a decrypt key. The analysis shows that there has been a significant improvement in encryption techniques used by ransomware. The careful analysis of ransomware behavior can produce an effective detection system that significantly reduces the amount of victim data loss.