Endpoint Detection and Response (EDR) for UK Businesses

What Is Endpoint Detection and Response?

Endpoint Detection and Response (EDR) is a category of endpoint security software that continuously monitors device activity to detect, investigate, and respond to threats. Unlike traditional antivirus, which compares files against a database of known malware signatures, EDR analyses behaviour — monitoring how processes interact with the operating system, file system, memory, and network.

This behavioural approach allows EDR to detect novel threats, including malware variants that have been modified to evade signature detection, fileless malware that operates entirely in memory, and living-off-the-land attacks that abuse legitimate system tools like PowerShell or WMI to carry out malicious activity.

How EDR Works

An EDR agent installed on each endpoint continuously captures telemetry — process events, file system changes, registry modifications, network connections, and memory operations. This telemetry is sent to a central platform (either cloud-based or on-premises) where it is analysed against detection rules and machine learning models.

When suspicious behaviour is identified — for example, an Office document spawning a PowerShell process that then makes a network connection to an unusual external address — the EDR platform generates an alert. Depending on configuration, the tool can also take automated response action: quarantining a file, terminating a process, or isolating the device from the network to prevent lateral movement.

This combination of detection and automated response significantly reduces the time between threat identification and containment. In ransomware scenarios, rapid containment can prevent encryption from spreading to additional files or devices before a human investigates.

EDR vs Traditional Antivirus

Traditional antivirus protects against threats it has already seen — known malware that has been catalogued and added to a signature database. It is effective against commodity threats but struggles with novel variants, polymorphic malware that changes its signature on each infection, and fileless attacks that leave no files to scan.

EDR addresses these gaps by focusing on activity rather than appearance. A piece of ransomware that has never been seen before will still trigger EDR detection when it begins encrypting files, because the pattern of rapid file modification across multiple directories is anomalous behaviour regardless of the specific malware involved.

Microsoft Defender for Business as EDR

For most UK SMEs, Microsoft Defender for Business is AMVIA's primary EDR platform. It is included in Microsoft 365 Business Premium at no additional cost and provides genuine EDR capability: behavioural detection, attack surface reduction rules, endpoint isolation capability, and integration with Microsoft's global threat intelligence network. Defender for Business is significantly more capable than the consumer Windows Defender built into Windows 10 and 11.

AMVIA configures Defender for Business to Microsoft's recommended security baseline, enables attack surface reduction rules targeting common attack techniques, and integrates endpoint alerts with AmviaIQ for monitoring and investigation.

When Huntress EDR Adds Value

For businesses requiring a higher tier of managed detection — those in regulated sectors, those with elevated risk profiles, or those seeking MDR-level coverage — AMVIA deploys Huntress EDR alongside or instead of Defender for Business. Huntress adds a managed analyst layer that investigates every endpoint alert, reducing noise and ensuring genuine threats receive expert human analysis. Huntress is purpose-built for the SME and MSP environment and is highly regarded for its effectiveness at detecting persistent threats that automated tools can miss.

Key Considerations for UK SMEs

• EDR alerts require human investigation — without a managed service, alerts may accumulate without being acted on
• Microsoft Defender for Business provides EDR capability for businesses on M365 Business Premium at no additional licence cost
• Attack surface reduction rules should be configured alongside EDR — they prevent many attacks before detection is needed
• EDR should cover all managed endpoints — laptops, desktops, and servers — without exception
• Ensure EDR is integrated with your incident response process so detections trigger a defined response, not just an email notification

How AMVIA Can Help

AMVIA deploys and manages EDR for UK SMEs as part of its managed cybersecurity service. We configure Microsoft Defender for Business or Huntress EDR, monitor alerts through AmviaIQ, investigate significant detections, and take containment action when threats are confirmed. Monthly reports provide visibility of protection status and any incidents across your managed endpoint estate. Call AMVIA on 0333 733 8050 to discuss EDR requirements for your business.