Analyzing attacks that exploit the CVE-2021-40444 MSHTML vulnerability

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In August, Microsoft Threat Intelligence Center (MSTIC) identified a small number of attacks (less than 10) that attempted to exploit a remote code execution vulnerability in MSHTML using specially crafted Microsoft Office documents. These attacks used the vulnerability, tracked as CVE-2021-40444, as part of an initial access campaign that distributed custom Cobalt Strike Beacon loaders. These loaders communicated with an infrastructure that Microsoft associates with multiple cybercriminal campa…

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