Security experts from Sophos have published a report on the multimillion-dollar black market business for crooks. They analyzed the SamSam ransomware case as a case study. Researchers that have tracked Bitcoin addresses managed by the crime gang discovered that crooks had extorted nearly $6 million from the victims since December 2015. The largest ransom paid by an individual victim, so far, is valued at US$64,000. 74% of the known victims are based in the United States. The security firm also estimated that the group is netting around $300,000 per month.”]
Source: https://securityaffairs.co/wordpress/74944/cyber-crime/samsam-report.html