Russian APT UTA0355 Steals Microsoft 365 OAuth Tokens via Fake Security Conference Lures and WhatsApp Support Cyber Security Russian APT UTA0355 Steals Microsoft 365 OAuth Tokens via Fake Security Conference Lures and WhatsApp Support Do Son December 8, 2025 0 A sophisticated Russian threat actor, tracked as UTA0355, has launched a targeted phishing campaign impersonating prestigious international... Read More Read more about Russian APT UTA0355 Steals Microsoft 365 OAuth Tokens via Fake Security Conference Lures and WhatsApp Support