Microsoft MSHTML Flaw Exploited by Ryuk Ransomware Gang

Criminals behind the Ryuk ransomware were early exploiters of the Windows MSHTML flaw, actively leveraging the bug in campaigns ahead of a patch released by Microsoft this week.

Collaborative research by Microsoft and RiskIQ revealed campaigns by Ryuk threat actors early on that exploited the flaw, tracked as CVE-2021-40444. The bug is a remote code execution (RCE) vulnerability in Windows that allows attackers to craft malicious Microsoft Office documents. The two released separate reports online this week to provide a look into who has been using the flaw–which can be used to hide a malicious ActiveX control in an Office document–in attacks, as well as their potential connections to known criminal groups.

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Source: ThreatPost