Ransomware groups have exploited a Windows zero-day flaw.

Mutitple ransomware groups have been caught exploiting a Windows zero-day flaw. Microsoft has said they are aware of the sitution and are working to address it. They have also said that the ransomware groups have exploited the flaw in different ways.

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https://www.securityweek.com/second-ransomware-group-caught-exploiting-windows-flaw-as-zero-day/