Microsoft Defender for Endpoint provides enterprise-grade threat protection that stops cyberattacks before they compromise your business. From ransomware to credential theft, it delivers real-time detection, automated response, and vulnerability management across Windows, macOS, Linux, and mobile devices.
Here’s how to deploy it effectively.
What Is Microsoft Defender for Endpoint?
Microsoft Defender for Endpoint is an enterprise endpoint security platform designed to prevent, detect, investigate, and respond to advanced threats. It’s part of Microsoft Defender XDR (Extended Detection and Response) and integrates with your existing Microsoft 365 environment.
Available in three plans:
Defender for Business – Designed specifically for small and medium-sized businesses with simplified management.
Defender for Endpoint Plan 1 – Provides core endpoint protection including next-generation antivirus, manual response actions, and attack surface reduction capabilities.
Defender for Endpoint Plan 2 – Comprehensive solution with everything in Plan 1 plus automated investigation and remediation, advanced hunting, endpoint detection and response (EDR), and threat and vulnerability management.
Most Australian SMEs should target Plan 2 for comprehensive protection. Plan 1 covers basics but lacks automated response and advanced threat hunting capabilities essential for today’s threat landscape.
Core Capabilities
Next-Generation Protection:
Advanced antimalware and antivirus that goes beyond signature-based detection. Includes behavioural analysis, heuristic detection, cloud-delivered protection, and machine learning to identify threats that traditional antivirus misses.
Endpoint Detection and Response (EDR):
Real-time monitoring that alerts your security team about suspicious activity, provides context about threats, and enables immediate response actions like isolating compromised devices or quarantining files.
Automated Investigation and Remediation:
When threats are detected, Defender for Endpoint automatically investigates the scope of the compromise and takes remediation actions. This dramatically reduces the time between detection and resolution.
Threat and Vulnerability Management:
Continuous assessment of your devices to identify software vulnerabilities, misconfigurations, and security gaps. Provides prioritised recommendations based on actual risk to your environment.
Attack Surface Reduction:
Proactive rules that block common attack behaviours like malicious macros, credential theft attempts, and suspicious script execution before they cause damage.
Deployment Approach: The Audit-First Strategy
One of the most critical aspects of Defender for Endpoint deployment is implementing Attack Surface Reduction (ASR) rules correctly. These rules block behaviours commonly exploited by attackers, but deploying them incorrectly can disrupt legitimate business operations.
Why audit before enforcement?
ASR rules can block actions that look suspicious but are actually part of normal business workflows. For example, a rule that blocks processes from accessing LSASS (Local Security Authority Subsystem Service) will generate events when applications like web browsers try to access stored credentials during updates. These are good blocks, but you need to understand the volume and impact before enforcing.
The audit process:
Enable rules in Audit mode – Rules log what they would block without actually blocking it. This shows you the potential impact without disrupting users.
Monitor for 30-45 days – Microsoft recommends this timeframe to capture different business cycles and workflows. You’ll see which applications trigger rules and whether they’re legitimate or threats.
Review telemetry – Analyse which rules fire most frequently, which devices are affected, and whether the blocked activities are genuine threats or false positives.
Configure exclusions – For legitimate applications that trigger rules, create narrow, specific exclusions rather than disabling entire rules.
Transition to Block mode – Once you understand the impact, enable rules in Block mode progressively, starting with low-noise rules first.
Configuring Antivirus Policies Through Intune
Microsoft Defender for Endpoint includes next-generation antivirus capabilities far beyond traditional signature-based detection.
When deploying through Intune:
Enable Real-Time Protection:
Continuous monitoring that detects and blocks threats as they occur. This is your first line of defence.
Configure Cloud-Delivered Protection:
Connects to Microsoft’s cloud intelligence for rapid response to emerging threats. Essential for stopping zero-day attacks.
Set Scheduled Scans:
Regular full scans to detect dormant threats that may have evaded real-time protection.
Define Exclusions Carefully:
Sometimes legitimate applications need exclusions, but each exclusion creates a potential security gap. Document every exclusion with business justification and review them quarterly.
Enable Tamper Protection:
Prevents attackers from disabling security features. Once enabled, even local administrators cannot turn off Defender without proper authorisation.
Intune provides centralised management of these policies, ensuring consistency across all devices and reducing misconfiguration risks.
Defender for Servers: Protecting Server Workloads
For organisations with on-premises or cloud servers, Microsoft Defender for Servers (part of Microsoft Defender for Cloud) extends endpoint protection to server environments.
Two plan options:
Defender for Servers Plan 1:
Entry-level focusing on EDR capabilities through Defender for Endpoint integration.
Defender for Servers Plan 2:
Includes Plan 1 features plus:
- Agentless vulnerability scanning
- File integrity monitoring
- Just-in-time VM access
- Regulatory compliance assessment
- Integration with Microsoft Defender Vulnerability Management
Defender for Servers protects Windows and Linux servers across Azure, AWS, GCP, and on-premises environments. It provides unified visibility and management regardless of where your servers run.
Key capability: Agentless scanning means you can assess servers for vulnerabilities and malware without installing agents, reducing overhead and compatibility concerns.
Creating Consistent Security Baselines with Intune
Intune simplifies deployment of security policies across your entire device estate:
Push Defender for Endpoint onboarding policies:
Automatically enrol devices into Defender for Endpoint management.
Configure ASR rules, antivirus, and firewall settings:
Centrally managed and consistently applied.
Ensure compliance across platforms:
Windows workstations, Windows Servers, macOS, Linux, and mobile devices all managed from one console.
Accelerate onboarding:
New devices receive security policies automatically, ensuring protection from day one.
This consistency eliminates the “works on my machine” security gaps where different devices have different protection levels.
Deployment Steps
Phase 1: Prerequisites
- Verify Microsoft 365 licensing (Business Premium minimum, ideally with Defender suite or E5)
- Ensure devices meet platform requirements
- Confirm Microsoft Defender Antivirus is primary antivirus solution
- Enable cloud-delivered protection
Phase 2: Pilot Group
- Select representative devices from different departments
- Deploy Defender for Endpoint with ASR rules in Audit mode
- Configure antivirus and firewall policies
- Monitor for 30-45 days
Phase 3: Analysis
- Review audit data for false positives
- Create necessary exclusions
- Identify which ASR rules to enable first
- Document baseline security configuration
Phase 4: Phased Rollout
- Deploy to production groups progressively
- Start with least-risky ASR rules in Block mode
- Provide user communication and support resources
- Monitor closely for issues
Phase 5: Optimisation
- Fine-tune rules based on real-world data
- Quarterly reviews of exclusions and policies
- Continuous monitoring through Defender portal
- Regular security posture assessments
