Microsoft Defender XDR
Unified threat detection, investigation and response across endpoints, identities, email and cloud apps.
Technical Overview
Microsoft Defender XDR is an extended detection and response platform that brings together signals from Microsoft Defender for Endpoint, Defender for Identity, Defender for Office 365 and Defender for Cloud Apps. Related alerts are correlated into a single incident, so analysts see the full attack story instead of a pile of isolated alerts, and can act on it from one portal.
It covers endpoints (EDR, attack surface reduction and device response), identities (compromised accounts and lateral movement), email and collaboration (phishing, malware and business email compromise) and cloud apps (SaaS visibility, session controls and shadow IT discovery).
How Defender XDR works
A simple five-step flow from protection to response.
Technical architecture
A practical Defender XDR operating flow from telemetry collection to correlation, investigation and response.
- 01Protection workloadsEndpoint, identity, email and cloud-app protection generate security signals.
- 02Signal correlationRelated alerts and entities are correlated into incidents.
- 03InvestigationAnalysts pivot through evidence, entities, timelines and attack context.
- 04Hunting & detectionKQL-based Advanced Hunting supports proactive investigation and custom detections.
- 05ResponseAutomated or analyst-driven containment and remediation actions are applied where supported.
Protection → Correlation → Investigation → Hunting → Response
Core Capabilities
Defender XDR provides cross-domain incident correlation and prioritisation, automatic attack disruption for high-confidence attacks, and automated investigation and remediation. Security teams can hunt with KQL, build custom detection rules, use threat analytics, and take response actions such as isolating a device or disabling a compromised account.
Integrations
Defender XDR integrates with Microsoft Sentinel (incidents and data connector), Microsoft Entra ID and Conditional Access, Microsoft Intune for device onboarding and compliance, Microsoft Defender for Cloud, and Microsoft Purview for data and insider-risk signals. Third-party SIEM, SOAR and ticketing tools can connect through APIs.
Key benefits
The main outcomes your business can expect from a connected security approach.
- 01Unified VisibilityBring important security signals together in one place.
- 02Faster DetectionSpot suspicious activity and related alerts sooner.
- 03Clear InvestigationUnderstand the incident, affected assets and timeline.
- 04Faster ResponseSupport containment and remediation with better context.
Implementation Approach
We start by assessing your licensing, device estate, identity setup and current security controls. Devices are then onboarded, identity sensors deployed, and email and cloud app protection enabled. Next we configure policies, attack surface reduction rules and alert notifications, and tune alerts, exclusions and custom detections to cut noise. Finally we connect Defender XDR to Microsoft Sentinel or your SOC workflow, define response playbooks, and hand over runbooks and training, or operate it for you through ISS Managed SOC.
Operational & Security Considerations
Use least-privilege roles and separate administrative duties. Feature availability depends on Microsoft licensing (for example Microsoft 365 E5, E5 Security or standalone Defender plans), and response actions depend on the workload, configuration and permissions. Test policies and automated remediation with a pilot group before broad rollout, and document ownership, escalation and change-management procedures.
How ISS Technologies Helps
ISS Technologies assesses your environment, configures and integrates Defender XDR, and supports your team in day-to-day operations. For round-the-clock monitoring, pair it with our Managed SOC.