Microsoft Defender XDR Updates & Release Notes

(Preview) Threat detection for Microsoft Agent 365 agents: Microsoft Defender analyzes runtime signals from agent interactions, tool usage, and execution patterns to surface alerts in Microsoft Defender XDR. Detection uses observability data from Microsoft Copilot Studio, Microsoft Foundry, Microsoft 365 Copilot Agent Builder, and agents integrated through the Microsoft Agent 365 SDK. Analysts can investigate alerts through incidents and advanced hunting. For more information, see Detect and investigate threats to AI agents using Microsoft Defender.

(Preview) AI agent posture risk in Microsoft Defender: Microsoft Defender now assesses posture risk for AI agents, including enterprise agents and local agents discovered on endpoint devices. Risk levels are based on active risk indicators, such as configuration, access, runtime activity, endpoint and user context, and active alerts. Security teams can use posture risk and recommendations to prioritize risky agents and improve agent security posture. For more information, see AI agent posture risk in Microsoft Defender.

(GA) Security for Microsoft Agent 365 with Defender

With a Microsoft Agent 365 license, Microsoft Defender provides discovery, security posture, threat detection and investigation, and real-time protection for the AI agents in your tenant. Onboarding includes enabling data collection, connecting the Microsoft 365 app connector, and connecting Copilot Studio for real-time protection of Copilot Studio agents. For more information, see Protect AI agents using Microsoft Defender and Enable security for AI agents using Microsoft Defender.

(Preview) Entity enrichments with threat intelligence: Entity pages for IP addresses, domains, URLs, and files now include a Threat Intelligence Insights tab that surfaces enrichment data from Microsoft Threat Intelligence directly in the investigation workflow. Enrichments include reputation scores, attributed threat reports, infrastructure relationships, and sandbox analysis, eliminating the need to switch between separate tools during investigations. For more information, see View threat intelligence in entity pages.

(Preview) Local AI agent discovery on Windows endpoints: as part of the Defender AI agents experience, Microsoft Defender now automatically discovers supported local AI agents running on onboarded Windows devices - including coding agents and IDE extensions, desktop AI assistants, local AI runtimes, and agent platforms. Discovered agents appear as assets in the AI agent inventory, exposure map, and advanced hunting, giving security teams visibility into local AI agent usage across the organization. For more information, see Discover local AI agents.

(Preview) Local AI agent runtime protection on Windows endpoints

As part of the Defender AI agents experience, runtime protection for supported local AI agents on Windows endpoints is now available in public preview. Microsoft Defender inspects the agent loop (user prompts, tool calls, and tool responses) and can block risky activity before it executes, helping stop prompt injection and unsafe agent actions at the device level. Blocked and audited events appear as alerts in Microsoft Defender to support incident correlation and investigation workflows. For more information, see Set up AI agent runtime protection with Microsoft Defender for Endpoint.

(GA) The following advanced hunting schema tables are now generally available:

• The DisruptionAndResponseEvents table contains information about automatic attack disruption events in Microsoft Defender XDR.
• The CloudAuditEvents table contains information about cloud audit events for various cloud platforms protected by the organization's Microsoft Defender for Cloud.
• The CloudDnsEvents table contains information about DNS activity events from cloud infrastructure environments.
• The CloudProcessEvents table contains information about process events in multicloud hosted environments.

(Preview)

The AgentsInfo table in advanced hunting is now available in preview. The AIAgentsInfo table is transitioning to this new table, which provides a unified schema that supports agent inventory and governance for all agent types, including Copilot Studio, Microsoft Foundry, Microsoft 365 Copilot, third-party, and endpoint-discovered agents. Microsoft Agent 365 customers should use the AgentsInfo table today. The AIAgentsInfo table remains accessible until July 1, 2026. Update your queries to use AgentsInfo before this date. For more information, see Advanced hunting schema - Naming changes.