This technical analysis explores the mechanics of OAuth application consent attacks within Microsoft Entra ID, specifically focusing on how attackers can leverage legitimate-looking third-party applications to gain access to sensitive user data like emails. Using a hypothetical scenario involving a ChatGPT-themed application, the article breaks down the telemetry found in Azure AuditLogs, providing a detailed mapping of fields required to identify who, what, and how a consent event occurred.
Furthermore, the article outlines robust detection and remediation strategies. It suggests focusing on non-admin permission grants for new third-party applications that request commonly abused scopes such as Mail.Read. Actionable remediation steps are provided using Microsoft Graph PowerShell commands to remove malicious consent grants and service principals, alongside a summary of Microsoft's recommended mitigation policies to prevent such attacks at scale.
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