Threat actors are initiating cross-tenant Microsoft Teams communications while impersonating IT or helpdesk personnel to socially engineer users into granting remote desktop access. After access is established through Quick Assist or similar remote support tools, attackers often execute trusted vendor-signed applications alongside attacker-supplied modules to enable malicious code execution.
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This attack chain exemplifies the evolving tactics of threat actors who exploit trust in enterprise collaboration tools to bypass traditional security controls. The reliance on social engineering—rather than technical vulnerabilities—highlights a critical gap in defenses: human decision-making under pressure. The attackers leverage the legitimacy of Microsoft Teams and remote support tools to blend into routine IT operations, making detection challenging. This pattern aligns with broader trends ...