Defender for Endpoint Deployment & SOC Enablement

Engagement Overview

Cybernerds was engaged to deploy Microsoft Defender for Endpoint across a professional services firm's hybrid workforce and establish SOC-ready operational procedures. The engagement followed the PDS framework to deliver a structured EDR deployment with centralized alerting, automated response playbooks, and security operations enablement.

Initial State

The organization relied on a traditional antivirus product with no centralized visibility or incident response capability. Key conditions included:

• ✓Legacy antivirus deployed inconsistently across Windows and macOS devices
• ✓No centralized security dashboard or alert management system
• ✓No endpoint detection and response (EDR) capability — only signature-based scanning
• ✓IT team handled security incidents reactively with no documented procedures
• ✓Remote employees had no consistent endpoint protection enforcement
• ✓No integration between endpoint security and identity or access controls

Key Challenges

• ✓Visibility: No centralized view of endpoint security posture across the organization
• ✓Detection: Signature-based antivirus unable to detect behavioral threats or living-off-the-land attacks
• ✓Response: No automated or documented incident response procedures
• ✓Coverage: Inconsistent protection across Windows and macOS, office and remote
• ✓Integration: Endpoint security operating in isolation from identity and access management
• ✓Operations: IT team lacked security operations training and tooling

Solution Design — PDS Framework

• ✓EDR Deployment: Microsoft Defender for Endpoint onboarded via Intune for Windows and manual enrollment for macOS
• ✓SIEM Integration: Microsoft Sentinel workspace configured to ingest Defender alerts and Entra ID sign-in logs
• ✓Alert Triage: Automated classification rules and severity-based routing for Sentinel incidents
• ✓Response Playbooks: Documented procedures for common incident types — malware detection, suspicious sign-in, data exfiltration attempt
• ✓Conditional Access: Device risk-based policies blocking access from compromised endpoints
• ✓Reporting: Weekly security posture dashboard and monthly executive summary template

Implementation — PDS Execution

Deployment followed a phased approach — pilot group first, then office-based devices, then remote workforce — with threat simulation testing at each stage.

• ✓Onboarded all Windows endpoints to Defender for Endpoint via Intune configuration profile
• ✓Enrolled macOS devices using Defender deployment package and management profile
• ✓Configured attack surface reduction rules aligned with organizational risk profile
• ✓Deployed Microsoft Sentinel with Defender for Endpoint and Entra ID data connectors
• ✓Built analytics rules for high-priority threat scenarios — credential theft, ransomware indicators, lateral movement
• ✓Created automated response playbooks in Sentinel for common alert types
• ✓Configured device risk-based Conditional Access — blocking sign-in from high-risk endpoints
• ✓Built SOC dashboard in Sentinel for real-time alert monitoring and incident tracking
• ✓Developed incident response runbooks with escalation procedures

Validation — PDS Validation Phase

• ✓All Windows and macOS endpoints reporting to Defender for Endpoint console
• ✓Sentinel ingesting and correlating alerts from Defender and Entra ID
• ✓Simulated threat scenarios triggered expected alerts and automated responses
• ✓Conditional Access correctly blocking sign-in from devices flagged as high-risk
• ✓ASR rules enforced without false positive disruption to business applications
• ✓SOC dashboard providing real-time visibility into security posture and active incidents
• ✓IT team completed incident response training using documented runbooks

Outcome

• ✓Full EDR coverage across all Windows and macOS endpoints — office and remote
• ✓Centralized security operations via Microsoft Sentinel with automated alert triage
• ✓Proactive threat detection replacing reactive, signature-only antivirus
• ✓Device risk integrated into identity and access control decisions
• ✓Documented incident response procedures with escalation paths
• ✓Weekly and monthly security reporting for leadership visibility
• ✓IT team enabled to operate as a functional SOC with defined procedures