Ransomware is a type of malicious software made for the extortion of money. In principle, the software works by blocking the whole computer system or access to a user’s data through file encryption and then demands a ransom from the victim. Ransomware attacks are mainly target large organizations, as they have a large amount of valuable information and are ready to pay for it. Currently, as cryptocurrency has become one of the most convenient and fastest ways of payment, a lot of companies buy digital currencies in order to escape quickly from a ransomware attack. Bitcoin has also become one of the most popular currencies that is demanded by extorters as payment because of its relative anonymity and speed of transactions.