Managed Detection & Response (MDR)
MDR vs SOC vs SIEM: Understanding the Key Differences
SIEM is a technology platform for collecting and correlating security logs, SOC is a team of analysts who monitor and respond to security events, and MDR is a managed service that combines technology, expert analysts, and active incident response into a single outsourced solution.
Andreas Johansson · Chief Executive Officer
Senior IT management leader with 25 years of experience in Cloud, Security, and Datacenter infrastructure.
SIEM: The Technology Layer
Security Information and Event Management (SIEM) is a software platform that aggregates log data from across your IT environment — firewalls, servers, endpoints, applications, cloud services — and correlates events to detect potential security incidents.
- What SIEM does well:
- Centralizes log collection from hundreds of data sources
- Correlates events across systems to identify attack patterns
- Provides long-term log storage for compliance and forensics
- Enables custom detection rule creation
- Generates compliance reports for auditors
- What SIEM requires:
- Skilled security engineers to deploy, configure, and maintain
- Analysts to write and tune detection rules (reducing false positives)
- 24/7 staffing to monitor and investigate alerts in real time
- Ongoing investment in rule development as threats evolve
- Integration work for each new data source
- The SIEM challenge: Most organizations that invest in SIEM underestimate the operational burden. A SIEM without skilled analysts is an expensive log storage system. Cisco's 2017 Annual Cybersecurity Report found that just 56% of security alerts were investigated, and it pointed to complexity and manpower challenges facing defenders.
SOC: The People Layer
A Security Operations Center (SOC) is a team responsible for monitoring, detecting, analyzing, and responding to security incidents. The SOC uses tools — including SIEM, EDR, threat intelligence platforms, and ticketing systems — but the SOC itself is the people and processes.
- In-house SOC advantages:
- Full control over security operations and priorities
- Deep understanding of business context and risk tolerance
- Ability to customize processes and tools to organizational needs
- Direct integration with IT operations and development teams
- In-house SOC challenges:
- Requires minimum 8–12 analysts for 24/7 coverage (3 shifts × 365 days)
- High total annual cost, including salaries, tools, and overhead
- Talent retention is extremely difficult — average SOC analyst tenure is 18–24 months
- Building mature detection capabilities takes 2–3 years
- Alert fatigue and burnout cause high turnover
- Outsourced SOC (sometimes called SOC-as-a-Service) provides monitoring through a third-party provider. This reduces staffing burden but may lack the active response capabilities that define MDR.
MDR: Technology + People + Action
Managed Detection & Response combines the technology layer (like SIEM), the people layer (like SOC), and adds active response — creating an outcome-focused service:
- How MDR differs from SIEM:
- MDR is a service; SIEM is a tool
- MDR includes human analysts; SIEM requires you to provide them
- MDR takes response actions; SIEM generates alerts for you to act on
- MDR optimizes detection continuously; SIEM requires you to write and tune rules
- How MDR differs from traditional SOC outsourcing:
- MDR providers take active containment actions (isolating endpoints, blocking threats)
- MDR includes proactive threat hunting, not just reactive alert monitoring
- MDR typically provides faster response times (minutes vs hours)
- MDR leverages broader threat intelligence across all their clients
Which Model Is Right for You?
- Choose SIEM alone when:
- You have a mature in-house security team (8+ analysts)
- You need full control over detection logic and data
- You have specific compliance requirements for log retention and custom reporting
- Budget allows for both the platform and the staff to operate it
- Choose in-house SOC when:
- Security is a core business differentiator
- You have the budget for round-the-clock staffing
- You need deep integration between security and business operations
- You can recruit and retain security talent in your market
- Choose MDR when:
- You lack the staff for 24/7 security monitoring
- You need detection and response capabilities quickly (weeks, not years)
- Your security operations budget can't stretch to an in-house SOC
- You want an outcome-focused service rather than managing tools
Many organizations use a hybrid approach — internal security leadership setting strategy and managing risk, with MDR providing the 24/7 detection and response execution.
How SeqOps fits
SeqOps finds the vulnerabilities and misconfigurations attackers use to get in, and ranks which to fix first. It works alongside managed detection and response, SIEM and EDR tools, and doesn't detect or respond to attacks itself.