ZDNet: These ransomware criminals lost millions of dollars in payments when rese
archers secretly found mistakes in....
[1]https://www.zdnet.com/article/cybersecurity-researchers-secretly-cost-ransomw
are-criminals-millions-of-dollars-after-finding-mistakes-in-their-code/

References

   1. https://www.zdnet.com/article/cybersecurity-researchers-secretly-cost-ransomware-criminals-millions-of-dollars-after-finding-mistakes-in-their-code/