External Teams call impersonating IT support after email bombing
This rule detects potential social engineering attacks where an attacker initiates a Microsoft Teams call from an external domain while impersonating an internal IT support or help desk entity. The detection specifically correlates this event with a recent preceding email bombing campaign (exceeding 20 emails) targeting the same user within the last 3 hours, indicating a coordinated attempt to pressure or confuse the victim.
Splunk (SPL)
