What Is MDR (Managed Detection and Response)?
Managed Detection and Response (MDR) is a cybersecurity service that combines endpoint monitoring, threat hunting, and human-led incident response. Unlike antivirus software, MDR involves security analysts actively investigating and containing threats on your behalf, around the clock.
Direct Answer
MDR (Managed Detection and Response) is a managed security service in which a team of analysts monitors your endpoints, network, and identity layer 24/7 and takes active steps to investigate and contain threats. It goes beyond traditional antivirus or EDR tools by providing human expertise that can identify attacker behaviour, contain compromised devices, and guide incident response. MDR is particularly relevant for SMEs that lack in-house security staff but need more than automated detection can provide. AMVIA delivers MDR through a combination of Huntress and Microsoft Defender tooling, operated by its security team. 21% of businesses that experienced a breach reported a negative outcome such as loss of money or data. 7% of businesses that experienced a breach reported temporary loss of access to files or networks — up from 4% in 2024.
What MDR Includes
MDR services vary, but the following components are typically included in a well-constructed managed detection and response offering.
Endpoint Detection and Response (EDR)
A lightweight agent deployed on every device collects telemetry — process activity, network connections, file changes — and sends it to a managed platform for analysis.
24/7 Threat Monitoring
Security analysts review alerts and investigate suspicious activity around the clock. Issues are triaged and escalated based on severity.
Threat Hunting
Proactive search for indicators of compromise that automated rules may miss. Analysts look for attacker behaviour patterns rather than waiting for alerts to fire.
Incident Containment
When a threat is confirmed, analysts can isolate affected devices, terminate malicious processes, and guide remediation — reducing dwell time and blast radius.
Forensic Investigation
Post-incident, MDR providers can reconstruct what happened, identify the root cause, and recommend steps to prevent recurrence.
Reporting and Evidence
Regular reports on threat activity, investigations, and remediation actions provide an audit trail for compliance, insurance, and board-level review.
Antivirus vs EDR vs MDR
How the three tiers of endpoint security differ in what they detect, how they respond, and what they cost.
| Feature | Antivirus (AV)Signature-based | EDRBehavioural detection | MDRManaged + human responseRecommended |
|---|---|---|---|
| Known malware detection | |||
| Behavioural / anomaly detection | |||
| 24/7 human monitoring | |||
| Active threat hunting | |||
| Incident containment | Manual | ||
| Forensic investigation | Limited | ||
| Typical per-device cost /mo | £2–£5 | £5–£15 | £12–£30 |
MDR is not a replacement for good endpoint hygiene, patching, and MFA — it is an additional detection and response layer on top of these controls.
Frequently Asked Questions
Antivirus relies on known malware signatures and cannot detect novel threats or attacker behaviour that does not involve malware files. MDR adds behavioural analysis, 24/7 human analyst monitoring, active threat hunting, and incident containment capability. With 19,000 UK businesses hit by ransomware in 2025 (Sophos), traditional antivirus alone is insufficient — MDR catches threats that signature-based tools miss entirely.
Key criteria include 24/7 human analyst coverage (not just automated alerts), mean time to respond, whether the service includes active containment or only notification, and how threat hunting is conducted. Ensure the provider can demonstrate UK-relevant experience. The average cost of the most disruptive breach is £3,550 (DSIT 2025), so an MDR provider that only sends alerts without acting on them provides limited value.
No. MDR is a detection and response layer that works best when foundational controls are already in place. Without MFA, patch management, and email security, MDR analysts will be overwhelmed by preventable incidents. Only 40% of UK businesses have two-factor authentication enabled (DSIT 2025). MDR should be viewed as an additional layer that catches threats which bypass your preventive controls, not a substitute for them.
Add Managed Detection and Response to Your Security Stack
AMVIA's MDR service provides 24/7 endpoint monitoring and human-led incident response for UK SMEs. Speak to our team to understand what's covered.
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