What is Managed Detection and Response (MDR)?

According to the 2026 Kaseya State of the MSP Report, 61% of MSPs report that most or all of their clients turn to them for cybersecurity advice. MDR is increasingly how MSPs deliver on that expectation without building a full security operations team from scratch.

Security operations is a 24/7 requirement. Threats don’t wait for business hours, and the data on attack timelines makes the case plainly: the average eCrime breakout time from initial access to lateral movement is now 29 minutes (CrowdStrike Global Threat Report, 2026). An organization without continuous monitoring doesn’t get hours to respond. It gets minutes.

Building and staffing an in-house security operations center (SOC) with the analysts, tooling, processes, and expertise to detect and respond to threats around the clock costs over $735,000 per year to staff and operate. That’s before tooling. For the overwhelming majority of organizations, that investment isn’t feasible.

Managed Detection and Response (MDR) addresses this gap by delivering SOC capabilities as a managed service: a team of security experts, equipped with advanced detection technology, monitoring your environment and responding to threats on your behalf, 24/7.

What Is MDR?

MDR is a managed security service that combines technology, typically EDR, network detection, SIEM, and threat intelligence, with human expertise to provide continuous threat monitoring, detection, investigation, and response. The key word is “response”: unlike alert monitoring services that notify you of detections, MDR providers act on your behalf to contain and remediate threats.

The service operates 24/7 with a team of security analysts who monitor telemetry from the customer’s environment, investigate alerts that automated systems flag, distinguish genuine threats from false positives, and take containment actions when a real threat is confirmed. Isolating endpoints, blocking malicious processes, and guiding the customer through remediation are all within scope.

MDR is outcome-driven. The value isn’t the technology stack, which you could assemble yourself. It’s the human expertise operating that stack around the clock, making the judgments that automated systems can’t make, and acting in the window before a threat becomes a breach.

What MDR Includes

Threat detection. Continuous monitoring of endpoint, network, identity, and cloud telemetry using EDR, network detection tools, and SIEM data. Detection uses both automated rules and analyst review to catch threats that automated systems alone miss, particularly the behavioral anomalies that don’t match known signatures.

Alert investigation. Security analysts review and triage alerts to determine whether they represent genuine threats or false positives. Modern security tools generate thousands of alerts daily. Without analyst triage, the signal gets buried in noise and alert fatigue sets in. MDR removes this burden from the in-house team.

Threat hunting. Proactive searching through telemetry for indicators of compromise that didn’t trigger automated detection, looking for the early-stage attack activity, reconnaissance, lateral movement, privilege escalation, that precedes a visible incident. Ransomware attacks that build over weeks before encryption requires this kind of proactive detection to catch.

Incident response. When a confirmed threat is identified, MDR providers take containment actions: isolating affected endpoints, blocking malicious processes, and coordinating the broader incident response. The provider handles immediate containment; the customer and provider jointly handle investigation, remediation, and recovery depending on service scope.

Threat intelligence. MDR providers aggregate threat intelligence from across their customer base and external sources, continuously updating detection rules as new threats emerge. This collective intelligence benefit means the provider’s detection capability improves with every incident across their entire customer portfolio.

Reporting. Regular reporting on security posture, threat activity, detection and response metrics, and incident trends, providing the evidence trail that compliance requirements demand and that stakeholders need to understand security investment value.

How MDR Works

The operational flow of MDR is straightforward, though the underlying execution is complex.

Telemetry collection. The MDR provider’s technology stack collects security data from endpoints, networks, identity systems, email, and cloud platforms.

Automated detection. Machine learning models and rule-based detection identify anomalies and known threat patterns in the telemetry stream, generating alerts for analyst review.

Analyst triage. Security analysts review alerts, apply context, and determine which represent genuine threats. False positives are filtered. Real threats are escalated for investigation.

Investigation. Confirmed threats are investigated to understand scope, affected systems, attack vector, and the full kill chain. MITRE ATT&CK mapping helps categorize techniques and understand the adversary’s objectives.

Containment and response. Containment actions are executed: isolating affected endpoints, blocking malicious processes, revoking compromised credentials. The customer is notified and guided through the broader remediation process.

Recovery and learning. Post-incident, detection rules are updated based on what was learned, and a report documents what happened, how it was handled, and what can reduce the likelihood of recurrence.

MDR vs MSSP: What’s the Difference?

Managed Security Service Providers (MSSPs) and MDR providers are sometimes conflated, but there is a meaningful operational distinction:

MSSPs typically provide monitoring and alerting. They watch for threats and notify the customer when something is detected. Investigation and response remain the customer’s responsibility.

MDR providers include investigation and response in the service. They don’t just tell you something happened. They determine what it was, how serious it is, and take action to contain it. The response capability is the defining characteristic.

The distinction matters when assessing the operational burden each model places on the customer. An MSSP that generates alerts requiring investigation and response from an in-house team provides less relief for resource-constrained organizations than an MDR provider that handles those steps within the service. For organizations without in-house security analysts, an MSSP alert is effectively useless without someone to act on it.

MDR vs EDR vs XDR

These three terms describe related but distinct security capabilities that appear constantly in the same conversations:

EDR (Endpoint Detection and Response) is a technology platform that monitors endpoint behavior, detects threats at the device level, and provides response capabilities like endpoint isolation. EDR is a tool you operate yourself. Without analysts to investigate its detections, EDR generates alerts that may go unreviewed.

XDR (Extended Detection and Response) extends EDR’s visibility across multiple security layers, pulling telemetry from endpoints, network, identity, email, and cloud into a unified detection and response platform. XDR is still a technology platform, not a managed service.

MDR (Managed Detection and Response) is the service layer that operates EDR or XDR on your behalf. MDR providers typically use EDR and XDR tooling as the detection foundation, then add the analyst team, threat hunting, investigation, and response that turns the technology into an operational security service.

In practice: EDR and XDR tell you what’s happening. MDR tells you what it means and does something about it.

Who Needs MDR?

MDR is relevant for any organization that:

• Lacks in-house security analysts to monitor EDR detections and investigate alerts around the clock
• Needs 24/7 detection and response coverage that a small in-house team can’t provide
• Has experienced a security incident and recognizes the gap between having security tools and having an operational response capability
• Is subject to cyber insurance requirements or compliance frameworks that mandate continuous monitoring and documented incident response
• Wants to demonstrate security maturity to clients, board members, or auditors without the cost and complexity of building an in-house SOC

That describes most SMBs and a significant proportion of mid-market organizations. The economics are compelling: building equivalent in-house capability requires multiple security analyst FTEs, specialist tooling licenses, and 24/7 shift coverage, at over $735,000 per year before tooling. MDR delivers that capability for a fraction of the cost.

For MSPs specifically, the stakes are higher. MSPs hold privileged access to dozens of client environments through their RMM and PSA platforms. That access makes them high-value targets for supply chain attacks. An MSP without MDR coverage for its own infrastructure is an exposed attack path into every client it manages.

MDR and Kaseya SIEM: How They Work Together

MDR and SIEM address the same problem from different angles. MDR is a managed service, a team of analysts monitoring your environment and responding to threats. SIEM is a technology platform that aggregates, correlates, and analyzes security telemetry from across your environment.

Kaseya offers both. Kaseya SIEM, now generally available, unifies telemetry across endpoint, network, cloud, identity, and email, correlating signals from more than 60 data sources with 400-day log retention. For organizations that want to run their own security operations, SIEM provides the platform. For those who want the coverage without the operational burden, Kaseya’s 24/7 managed SOC service, powered by Kaseya Intelligence, delivers MDR capability on top of that telemetry foundation.

The two work best together: SIEM provides the data breadth and retention; MDR provides the human expertise that turns data into protective action. Explore Kaseya SIEM.

MDR for MSPs: Extending the Security Stack

For MSPs, MDR creates two distinct opportunities.

Internally, MDR provides the security operations coverage that protects the MSP’s own environment, including the high-privilege RMM and PSA platforms that make MSPs attractive targets. An MSP with MDR coverage for its own infrastructure is significantly more resilient to supply chain attacks that target MSPs as an entry point to their client base.

As a client-facing service, MDR delivered to clients provides the security capability most SMBs can’t afford to build themselves. MSPs that include MDR as a standard component of their security offering, rather than recommending it as an optional add-on, are providing genuinely comprehensive protection and differentiating from competitors who deliver monitoring without response.

Kaseya’s MDR service, available in Kaseya 365 Endpoint Pro, is delivered by US-based security analysts operating 24/7. It integrates with Datto EDR and the broader Kaseya 365 platform, providing MSPs and internal IT teams with a complete managed security operations capability. Explore Kaseya 365 Endpoint Pro.

Key Takeaways

• MDR delivers 24/7 threat monitoring, investigation, and response as a managed service, providing SOC capability without the $735,000+ annual cost of building one in-house.
• The defining characteristic of MDR vs MSSP is response: MDR providers take containment actions on your behalf, not just notify you that something happened.
• MDR is the service layer that operates EDR and XDR technology on your behalf. EDR and XDR are tools; MDR is the managed service that makes those tools operationally effective.
• With average eCrime breakout times now at 29 minutes, continuous 24/7 analyst coverage isn’t a premium, it’s a baseline requirement for organizations that want to contain threats before they spread.
• For MSPs, MDR is both an internal security control protecting privileged RMM and PSA access, and a client-facing service that delivers the security capability most SMBs can’t build themselves.