Threat Actors Impersonate Microsoft OAuth Apps to Steal Login Credentials

Threat actors are leveraging sophisticated phishing campaigns by creating fake Microsoft OAuth applications to impersonate legitimate enterprises, enabling credential theft while bypassing multifactor authentication (MFA). Proofpoint researchers have tracked this activity since early 2025, identifying over 50 impersonated applications, including those mimicking RingCentral, SharePoint, Adobe, and DocuSign. These malicious OAuth apps serve as initial lures, […]

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