What Is EDR?
Endpoint Detection and Response (EDR) is a category of security tools that continuously monitors endpoint devices, such as laptops, desktops, and servers, to detect, investigate, and respond to cyber threats.
Unlike traditional antivirus, which relies primarily on signature-based detection, EDR uses behavioural analysis, machine learning, and threat intelligence to identify suspicious activity that would otherwise go unnoticed.
Think of traditional antivirus as a lock on your front door. EDR is a comprehensive security system with cameras, motion sensors, and a 24/7 monitoring team.
EDR vs Traditional Antivirus
Understanding the differences helps illustrate why EDR is becoming essential:
Detection method - Antivirus matches files against a database of known threats (signatures). EDR analyses behaviour patterns to detect both known and unknown threats
Visibility - Antivirus provides limited visibility into what happened during an incident. EDR records detailed telemetry about every process, file change, and network connection
Response capabilities - Antivirus can quarantine or delete files. EDR can isolate devices, kill malicious processes, roll back changes, and initiate automated response playbooks
Threat hunting - Antivirus is purely reactive. EDR enables proactive threat hunting to find hidden threats before they cause damage
Zero-day protection - Antivirus struggles with brand-new threats. EDR's behavioural analysis can detect zero-day attacks by identifying suspicious patterns
How EDR Works
EDR solutions typically operate in four stages:
1. Continuous Monitoring
A lightweight agent installed on each endpoint continuously records activity including process execution, file modifications, registry changes, network connections, and user behaviour.
This data is sent to a central platform for analysis.
2. Threat Detection
The platform analyses endpoint telemetry using multiple techniques:
Behavioural analysis to detect unusual patterns
Machine learning models trained on millions of threat samples
Threat intelligence feeds from global security research
Correlation of events across multiple endpoints to identify coordinated attacks
3. Investigation
When a threat is detected, EDR provides security teams with detailed information to investigate the incident.
This includes a full timeline of events, affected files and processes, and the attack chain from initial entry to current state.
4. Response
EDR enables rapid response through:
Automated containment - Isolating the affected device from the network to prevent lateral movement
Remote remediation - Killing malicious processes, removing files, and reversing changes without physical access to the device
Rollback - Some EDR solutions can restore files encrypted by ransomware to their pre-attack state
Key Features to Look For
When evaluating EDR solutions for your business, consider these features:
Cloud-native architecture for real-time updates and scalability
Low performance impact on endpoint devices
Integration with your existing tools (Microsoft 365, SIEM, etc.)
Automated response capabilities to reduce reliance on manual intervention
24/7 managed detection and response (MDR) option if you lack in-house security expertise
Does Every Business Need EDR?
In short, yes. In today's threat landscape, EDR is no longer a nice-to-have reserved for large enterprises or regulated industries - it is a fundamental layer of protection that every business should have in place.
Traditional antivirus works by matching files against a database of known threats. The problem is that modern attacks - fileless malware, living-off-the-land techniques, zero-day exploits, and sophisticated ransomware - are specifically designed to bypass this approach. If your only defence is traditional antivirus, you are exposed.
Cyber criminals do not just target big businesses. Small and medium-sized organisations are increasingly in the crosshairs precisely because attackers know their defences are often weaker. The cost of a breach - downtime, data loss, reputational damage, regulatory fines - can be devastating regardless of your size.
EDR gives you the visibility and response capability to catch threats that traditional antivirus misses. It is the difference between finding out about an attack after the damage is done and stopping it in its tracks.
Our security team can help you choose the right EDR solution, deploy it across your organisation, and provide ongoing managed detection and response so your endpoints are protected around the clock.