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Digital assets are one of the most important precious entities for any organization and if someone captures them for the purpose of ransom, then it would be a serious threat. The threat actor behind this activity is the ransomware. The threat posed by the ransomware on personal and business data assets expands very quickly. Data on an infected computer becomes encrypted until a ransom is paid for its release. Each year, ransomware causes hundreds of millions of dollars of losses for the companies throughout the world. Frequently, new versions are released because of the enormous profit margins and notorious practices. Antivirus software and other intrusion detection systems can be bypassed, so they are not a permanent solution so-far. This research work contributes some latest dissemination and mitigation techniques that are using in ransomware attacks. We also discussed the countermeasures to mitigate the ransomware attacks and some decryption tools and ransomware simulation to find the vulnerabilities in the system.