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Beyond the Inbox: How Threat Actors Abuse Microsoft Teams External Chat for Initial Access

Summary by Arctic Wolf
Arctic Wolf has observed a recurring social engineering pattern in more than 400 incidents where threat actors have used Microsoft Teams' external chat creation feature for impersonation scams, or to deliver malicious files.
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In hundreds of cases, Arctic Wolf Labs has observed a recurring social engineering pattern in which attackers use the external chat creation feature in Microsoft teams to output as trusted persons or spread malicious files. This shows a consistent approach: The attackers repeatedly use the same temporarily created tenants, the same ad names as "IT Support (Internal), [...] The article Arctic Wolf observes recurring social engineering pattern fir…

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Arctic Wolf broke the news on Monday, October 26, 2026.
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