DANGEROUS INVITATIONS: RUSSIAN THREAT ACTOR SPOOFS EUROPEAN SECURITY EVENTS IN TARGETED PHISHING ATTACKS

Summary from the TLDR InfoSec newsletter

Russian threat actor UTA0355 impersonated multiple prominent European security conferences, including the Belgrade Security Conference and Brussels Indo-Pacific Dialogue, to harvest Microsoft 365 credentials. The attackers created convincing replica websites and abused OAuth and Device Code authentication flows. They used rapport-building outreach on WhatsApp and Signal, leveraged compromised accounts for credibility, and selectively triggered credential theft based on targeted email domains. Defenses include user training on OAuth consent prompts, monitoring anomalous device registrations in Entra ID, and enforcing conditional access controls.