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Microsoft Teams Attack Skips the Phish to Deliver Malware Directly

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Exploiting a flaw in how the app handles communication with external tenants gives threat actors an easy way to send malicious files from a trusted source to an organization's employees, but no patch is imminent.

A bug in the latest version of Microsoft Teams allows for external sources to send files to an organization's employees even though the application typically blocks such activity, researchers have found. This give threat actors an alternative to complex and expensive phishing campaigns to deliver malware into target organizations — but Microsoft won't be addressing it as a priority.

Researchers Max Corbridge (@CorbridgeMax) and Tom Ellson (@tde_sec) from JUMPSEC Labs' Red Team discovered a way to exploit the Microsoft Teams External Tenants feature to slip malware into files sent to an organization's employees, thus bypassing nearly all modern anti-phishing protections, they revealed in a blog post published this week.

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