Quick answer: EDR, MDR, SIEM and SOC are not alternatives to each other but layers that serve different maturity levels and needs. EDR is a product and sees and stops threats on endpoints. SIEM is a product and collects and correlates logs from all systems. SOC is a team and monitors these tools 24/7 and responds to incidents. MDR delivers the SOC and tool capability from outside as a service. The right choice is determined by one question: do you have your own 24/7 monitoring team? If not, buying EDR and taking monitoring from outside with MDR is both faster and more cost effective for most SMBs than building a SIEM and SOC. Large and mature organizations prefer to build their own SIEM and SOC.

When making a security investment, the most confused concepts are EDR, MDR, SIEM and SOC. If it is not clear in the purchase decision what these four are and which one fits your situation, you either build an unnecessarily complex system or remain under protected. This article clearly separates the four and provides a selection matrix.

Four concepts, in one sentence

  • EDR (Endpoint Detection and Response). A product. It detects and stops suspicious behavior on computers and servers.
  • SIEM (Security Information and Event Management). A product. It collects logs from all systems, correlates them and produces alerts. See our SIEM and log management article for detail.
  • SOC (Security Operations Center). A team and a process. It monitors the tools 24/7, examines alerts and responds. See our SOC levels article for detail.
  • MDR (Managed Detection and Response). A service. It delivers the SOC and tool capability from outside with a subscription model. See our MDR managed SOC article for detail.

In short: EDR and SIEM are tools, SOC is a team, MDR combines the two as a service.

Selection matrix

Your situation Recommended layer Why
Small team, no in house security expert EDR plus MDR Take monitoring from outside, fast protection
Medium scale, partial IT team EDR plus MDR, then SIEM Visibility first, then central logging
Large, mature, regulated EDR plus SIEM plus own SOC Full control and compliance need
Compliance required but no team MDR plus SIEM service Meet compliance with a service
24/7 monitoring critical, cannot build a team MDR Continuous monitoring from outside

The essence of this matrix is: buying the tool is easy, but finding the people to monitor the tool 24/7 is hard. The choice is a question of monitoring capacity, not of the tool.

The most common mistake

Many organizations buy a SIEM but do not build the SOC team to monitor it. The result is a pile of alerts nobody looks at. A SIEM does not provide protection on its own, it only produces visibility; what turns that visibility into value is the team behind it. So for an organization that cannot build a team, MDR is far more effective than an unused SIEM.

The relationship between cost and maturity

EDR and MDR offer low initial cost and fast deployment, so they are the natural start for an SMB. Building your own SIEM and SOC requires high investment and a constant expert team, which only makes sense at a certain scale and maturity. The right strategy is usually gradual: fast protection with EDR and MDR first, central visibility with SIEM as you mature, and finally your own SOC. This path lets you grow your cyber security investment by need.

Choosing the right layer with DSET

DSET helps you determine the right security layer based on your organization's scale, IT maturity and compliance obligations. It runs threat detection at scale with the local AI engine KAOS, provides continuous monitoring with an MDR approach and offers consulting for SIEM and SOC setup when needed. The goal is to build not the most expensive system but the layer most suitable and sustainable for your situation.

Frequently asked questions

Should I buy EDR or SIEM? They do different jobs, one does not replace the other. EDR sees and stops threats on endpoints; SIEM collects and correlates logs from all systems. If you are a small organization, EDR first makes sense. SIEM gains meaning when there is a need for central visibility and a team to monitor it.

Is MDR cheaper than building a SOC? For most SMBs, yes. Building your own SOC requires high investment and a constant expert team. MDR provides the same 24/7 monitoring capability with a subscription model at a lower initial cost. Above a certain scale your own SOC can become meaningful cost wise.

I bought a SIEM but it is not working, why? Most likely you do not have a SOC team to monitor the SIEM and examine the alerts. A SIEM only produces visibility; what turns that visibility into response is people. If there is no team, taking monitoring from outside with MDR is more effective.

Sources

To choose the right layer among EDR, MDR, SIEM and SOC for your organization and plan a sustainable security investment, contact DSET. We provide consulting and managed security from our Ankara Hacettepe Teknokent laboratory.