Researchers at the cybersecurity firm Emsisoft helped recover encrypted files of victims of the BlackMatter ransomware operation.
The researchers determined that a vulnerability in BlackMatter's encryption process allowed encrypted files to be recovered without victims paying the ransom.
They did not announce the vulnerability when it was discovered earlier this year for fear the BlackMatter group would issue a fix.
Emsisoft's Fabian Wosar said, "Since then, we have been busy helping BlackMatter victims recover their data. With the help of law enforcement agencies, CERTs [computer emergency readiness teams], and private sector partners in multiple countries, we were able to reach numerous victims, helping them avoid tens of millions of dollars in demands."
From Tech Crunch
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