Major Passkey Phishing Campaign Compromises Microsoft Cloud Environments in 2026
Between May and September 2026, threat actors including Storm-3121 and Storm-3032 conducted sophisticated social engineering campaigns targeting Microsoft cloud environments. The attacks involved AI-assisted executive impersonation for invoice fraud, sending over one million scam emails in August 2026, and passkey-themed phishing operations. Attackers impersonated IT help desk personnel to trick employees into updating authentication methods through fraudulent websites, enabling adversary-in-the-middle attacks and device code authentication bypasses. Once successful, threat actors established persistent access by registering their own MFA methods and conducted extensive data exfiltration through Microsoft Graph API abuse, SharePoint downloads, and mailbox collection. This incident demonstrates the evolution of identity-focused attacks targeting cloud infrastructure and the increasing sophistication of social engineering tactics combined with legitimate cloud service abuse.
Kill Chain
