This research from Red Canary investigates the mechanics of OAuth application attacks within Entra ID, specifically focusing on how attackers exploit SaaS session integrity. By analyzing a hypothetical scenario where a user consents to a seemingly legitimate ChatGPT application, the article provides a deep dive into Azure AuditLogs. It breaks down the critical telemetry needed to distinguish between benign service principal additions and malicious consent grants, highlighting fields like CorrelationId and specific OAuth scopes such as Mail.Read.
The guide outlines a robust detection strategy that prioritizes identifying non-admin permissions granted to new, third-party applications. It further details remediation steps using Microsoft Graph PowerShell commands to remove illicit grants and service principals. Finally, it explores Entra ID mitigation settings, such as restricting user consent to verified publishers, to help organizations balance security with administrative overhead in their cloud environments.
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