Microsoft has detailed a 'cross-tenant helpdesk impersonation' attack technique where threat actors use Microsoft Teams' external access feature to pose as IT helpdesk staff, convincing employees to grant remote access. Unlike traditional phishing, this approach exploits user trust within legitimate collaboration workflows, making detection difficult since attackers use approved tools and appear as routine IT activity. Security experts describe it as an evolution of social engineering into real-time collaboration platforms, emphasizing the need for behavioral detection, tighter cross-tenant access controls, Zero Trust enforcement, and integrated SOC visibility across identity, endpoint, and collaboration layers.
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