What Is EDR? Endpoint Detection and Response vs Antivirus, XDR and MDR

What is EDR (endpoint detection and response)?

Endpoint detection and response (EDR) is security software that runs on laptops, desktops and servers. These devices are called endpoints. EDR records what happens on them all the time, such as programs starting, file changes, network connections and logins. It spots suspicious behavior. It also gives your team tools to look into an alert and respond. For example, they can cut a machine off from the network or stop a harmful program. Antivirus mainly tries to block known bad files. EDR assumes something will get through one day, and focuses on spotting and stopping it fast.

EDR is now a core part of endpoint security for most businesses. Many cyber insurance forms ask whether you run it. It is also one of the main data sources for a security operations center (SOC), a team that watches your systems for attacks 24/7.

How EDR works

EDR works in four steps, from collecting data to acting on it.

1. Collect telemetry. A small agent (program) on each endpoint records activity and sends it to a central platform, usually in the cloud. This includes programs starting and the commands they run, file and registry changes, network connections and user logins.
2. Detect. The platform looks for attacker behavior, not only known malware. One example is an Office document starting PowerShell, a built-in Windows admin tool. Others are credential dumping (stealing passwords from memory) or a sudden burst of file renames that looks like encryption. Detections are often mapped to MITRE ATT&CK, a public catalog of attacker techniques.
3. Investigate. Analysts see a timeline of what happened before and after an alert. They can see which other machines show the same signs, and how the attacker got in.
4. Respond. From the console, responders can isolate a computer, stop programs, quarantine files and collect forensic data. On many platforms they can also roll back changes.

EDR vs antivirus

Traditional antivirus and EDR solve different problems. Modern products often bundle both. But it helps to know the difference when you read a product sheet.

Attackers now often use real tools already on the system, such as PowerShell, remote admin software and stolen passwords. Antivirus has little to flag in that case. EDR looks at what those tools are being used to do.

Where EDR fits in endpoint security

EDR is one layer. A sensible endpoint security baseline also includes:

• Endpoint protection (next-generation antivirus) to block known threats before they run
• Patch management, to keep operating systems, browsers and common apps up to date
• Device management (MDM) to enforce disk encryption, screen lock and settings
• Removing local admin rights from everyday user accounts
• Multi-factor authentication (MFA), a second login step such as a phone code. Many attacks start with stolen passwords, not malware

EDR vs XDR vs MDR

These acronyms sound like rival products, but they describe different things. Two are technology and one is a service. XDR (extended detection and response) adds data from email, logins, cloud and network to EDR. MDR (managed detection and response) is an outside team that watches and responds for you.

XDR is useful because real attacks cross boundaries. A phishing email (a fake message that tricks people) leads to a stolen login. That leads to a hacked laptop. Linking those signals makes the story clearer. MDR answers a different question: who is watching the alerts. For a deeper comparison of service models, see our guide to managed SOC vs MDR.

Why EDR needs people watching it 24/7

Buying EDR is not the same as being protected by it. The tool can block some threats on its own. But many alerts need a human decision. Is this an admin running a normal script, or an attacker using the same tool? If nobody looks at that alert until Monday, the attacker has had the weekend.

Ransomware gangs lock your files and demand payment. They know when staff are away, and time many attacks for nights, weekends and holidays. A 24/7 monitoring team, in house or outsourced, turns EDR alerts into action. That means triage within minutes and cutting off the affected machine. It also means escalating to your incident response plan when needed.

How to choose an EDR: checklist

Use this checklist to compare EDR products. Each point affects how well the tool will protect you in practice.

• Coverage: supports every operating system you run, including Linux servers, macOS and cloud workloads.
• Detection quality: independent tests such as the MITRE ATT&CK Evaluations are one input. A trial in your own environment (a proof of concept) is better.
• Response actions: network isolation, process kill (stopping a program), remote shell, file retrieval and rollback.
• Telemetry retention: how many days of searchable history are included. Incidents are often found weeks later.
• Tamper protection: attackers try to switch off security agents, so check how the product resists that.
• Integrations: sends data to your SIEM or SOC platform and works with your identity and email security tools. A SIEM gathers security logs in one place and flags threats.
• Performance and management: how much the agent slows machines, how easy it is to deploy and how policies are managed.
• Who runs it: whether you have analysts to watch it 24/7, or need an MDR or SOC service on top.

How NextGarrison helps

NextGarrison's 24/7 SOC monitors EDR and other security data for our clients. We triage alerts and take agreed response actions, such as isolating a hacked computer. We escalate into incident response when needed. We can also review an existing EDR setup for coverage gaps and weak policies. See our security services, or read how detection fits into an incident response plan.