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On May 12th, the WannaCry virus began to massively block Windows-based computers around the world. The data on the hard drive was encrypted, and the virus forced the users to transfer the ransom to WannaCry Bitcoin wallets for the data return.
British hospitals, computers of Russian departments and other companies have suffered from the virus. The damage from the attack was estimated at about one billion dollars.
Distributed database that is used to maintain a continuously growing list of records, called blocks
Now, three months after the attack, someone unknown withdrew all the money from WannaCry Bitcoin wallets within 15 minutes. Thus, 7 transactions worth $142,000 were recorded by Quartz's bot:
— Keith Collins (@collinskeith) August 3, 2017
According to Quartz hypothesis, the money is likely to pass through a chain of other Bitcoin wallets in order to hide the final recipient.