EDR Explained: Why Endpoint Detection and Response is Essential for Modern Cyber Defence

Traditional antivirus catches known threats but misses sophisticated attacks. Endpoint Detection and Response (EDR) provides real-time monitoring, threat detection, investigation capabilities, and automated response—essential protection for modern cyber threats. Here's what Australian SMBs need to know about EDR.

What is EDR?

EDR continuously monitors endpoints (computers, laptops, servers) for suspicious activity. Unlike traditional antivirus that relies on signature matching, EDR uses behavioural analysis to detect threats—even previously unknown ones. When it detects something suspicious, EDR can automatically respond and provides tools for security teams to investigate.

EDR vs Traditional Antivirus

Traditional Antivirus

Relies on signature databases of known malware
Scans files at specific times or on access
Limited visibility into system behaviour
Basic quarantine and removal capabilities
Struggles with fileless malware and zero-day attacks

Endpoint Detection and Response

Continuously monitors endpoint behaviour
Detects anomalous activity patterns, not just known signatures
Records detailed activity data for investigation
Automated response capabilities (isolate, remediate)
Effective against fileless malware and advanced threats

Key EDR Capabilities

Real-Time Detection

EDR agents continuously monitor process execution, file changes, network connections, registry modifications, and user behaviour. Machine learning models identify suspicious patterns even without known signatures.

Threat Investigation

When an alert triggers, EDR provides the data needed to investigate: process trees, file timelines, network connections, and related events. Security teams can quickly understand what happened and how far a threat spread.

Automated Response

EDR can automatically contain threats: isolating infected devices from the network, killing malicious processes, quarantining files, and preventing lateral movement. Speed of response often determines the difference between a minor incident and a major breach.

Threat Hunting

Beyond reactive detection, EDR enables proactive threat hunting—searching for indicators of compromise that automated systems might miss. This is particularly valuable when new threat intelligence emerges.

EDR Solutions for SMBs

Microsoft Defender for Endpoint: Integrated with Microsoft 365, excellent for Microsoft-centric environments. Included in Microsoft 365 Business Premium.
CrowdStrike Falcon: Cloud-native, highly regarded detection capabilities, SMB-friendly pricing tiers available.
SentinelOne: Strong autonomous response capabilities, good SMB options.
Sophos Intercept X: Combines EDR with traditional endpoint protection, popular with MSPs.
Trend Micro: Comprehensive endpoint security with EDR capabilities.

Important Note

For Microsoft 365 Business Premium customers: Microsoft Defender for Endpoint is included in your licensing. You already have access to enterprise-grade EDR—make sure it's deployed and configured.

Implementation Considerations

1Deployment: EDR agents need installation on all endpoints. Cloud-managed solutions simplify this significantly.
2Initial tuning: Expect some false positives initially. Work with your provider to tune detection rules for your environment.
324/7 monitoring: EDR generates alerts that need response. Many SMBs partner with managed detection and response (MDR) providers for monitoring.
4Integration: EDR works best when integrated with your broader security stack—SIEM, email security, identity protection.
5Response procedures: Define how your team responds to EDR alerts. Who gets notified? What actions are authorised?

How We Researched This Article

This article was compiled using information from authoritative industry sources to ensure accuracy and relevance for Australian businesses.

Sources & References

→
MITRE ATT&CK Framework
Knowledge base of adversary tactics and techniques used by EDR for detection
→
Gartner Endpoint Security Research
Industry analyst research on endpoint protection and EDR solutions
→
Microsoft Defender for Endpoint
Microsoft's EDR documentation and deployment guidance

* Information is current as of the publication date. Cybersecurity guidelines and best practices evolve regularly. We recommend verifying current recommendations with the original sources.

Frequently Asked Questions

Do we still need antivirus if we have EDR? ▼

Most modern EDR solutions include traditional antivirus capabilities (often called EPP - Endpoint Protection Platform). You typically don't need separate antivirus if you have a comprehensive EDR solution. Microsoft Defender for Endpoint, for example, includes both.

Can we manage EDR ourselves or do we need a security team? ▼

EDR generates alerts that need evaluation and response. SMBs often partner with managed detection and response (MDR) services or their MSP for 24/7 monitoring and response. Self-management is possible but requires security expertise and response capabilities.

How much does EDR cost for a small business? ▼

Costs vary widely. Microsoft Defender for Endpoint is included in Microsoft 365 Business Premium ($33 AUD/user/month). Standalone EDR solutions typically cost $3-10 per endpoint per month. Add MDR services and costs increase to $15-30+ per endpoint.

Will EDR slow down our computers? ▼

Modern EDR agents are lightweight and cloud-managed, with minimal performance impact. Initial scans may temporarily increase resource usage, but ongoing monitoring is designed to be unobtrusive. Any performance concerns should be raised with your provider for tuning.