This article concludes a series on Microsoft Entra Agent ID by examining assistive agents and the "On Behalf Of" (OBO) authentication flow. It details how these agents utilize delegated permissions to perform tasks like administrative actions or data analysis on behalf of authenticated users, specifically within the Entra ID ecosystem.
The post presents a practical investigation scenario where an agent sends a suspicious email. By correlating Purview logs with Microsoft Graph Activity and AAD Non-Interactive Sign-In logs, the author demonstrates how security analysts can trace malicious activity back to its source, revealing hidden IP addresses and specific agent identities.
Included is a technical reference for distinguishing between different agent authentication types—autonomous, impersonation, and assistive—within audit logs. This framework is essential for security teams to build effective detection strategies and respond to the growing use of AI-driven agentic workflows in enterprise environments.
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