STAC4749 Teams Vishing Call Impersonating IT Helpdesk

Duo Tech@duotech

•updated Jul 31, 2026•0•0•3

Detects an inbound Microsoft Teams call or chat using a known STAC4749 helpdesk-impersonation persona display name, a caller UPN on a known STAC4749 .top IT-themed domain, or a source IP previously observed originating STAC4749 vishing calls.