The recent targeted attacks exploiting the (at the time) zero-day remote code execution vulnerability (CVE-2021-40444) in Windows via booby-trapped Office documents have been delivering custom Cobalt Strike payloads, Microsoft and Microsoft-owned RiskIQ have shared. The researchers also found connections between the attackers’ exploit delivery infrastructure and an infrastructure previously used by attackers to deliver human-operated ransomware, the Trickbot trojan and the BazaLoader backdoor/downloader.

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