Attackers Abuse Microsoft Teams and Quick Assist to Drop Stealthy A0Backdoor

A newly identified backdoor called A0Backdoor has emerged as part of a calculated social-engineering campaign that abuses Microsoft Teams and the Windows remote assistance tool Quick Assist. The threat group is tracked under aliases including Blitz Brigantine, Storm-1811, and STAC5777, and holds ties to the Black Basta ransomware network. Active since at least August 2025 […]

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