EDR stands for Endpoint Detection and Response. MDR stands for Managed Detection and Response. Both are modern security tools that go far beyond traditional antivirus. Here is what they actually do and why they matter.
Why traditional antivirus is not enough
Traditional antivirus works by matching files against a database of known threats. If a malicious file matches a known signature, it gets blocked. The problem: modern attacks rarely look like known threats. Attackers use fileless malware, living-off-the-land techniques, and zero-day exploits that have no signature to match against.
Traditional antivirus misses these attacks entirely. This is not a vendor problem. It is a fundamental limitation of the signature-matching approach. The security industry moved past it years ago. Most small businesses have not caught up.
What EDR does differently
EDR monitors behavior, not just file signatures. It watches what processes are doing: what files they touch, what network connections they make, what registry changes they initiate. When something behaves suspiciously, it flags and can automatically contain the threat, even if the specific malware has never been seen before.
EDR also gives security teams a forensic trail. If something does get through, you can see exactly what happened, when, on which device, and what data was accessed. That capability is critical for incident response and, in many industries, regulatory reporting.
EDR vs MDR: what is the difference?
EDR is the tool. MDR is the service that adds human monitoring and response on top of the tool. With EDR alone, you get great telemetry and automated responses, but someone still needs to review alerts and investigate. For small businesses without a security analyst on staff, that gap is real.
MDR fills that gap. A managed detection and response service means a team is watching your EDR alerts, investigating them, and taking action. For most small businesses, MDR is the right option because you get both the technology and the expertise without hiring a security analyst.
Do small businesses need EDR?
Yes. The misconception is that attackers only target large enterprises. In reality, small businesses are frequently targeted precisely because their defenses are weaker. Ransomware groups use automated scanning tools that find vulnerable networks regardless of company size. If you have internet-connected devices and data worth protecting, you are a potential target.
EDR on every managed device is now considered a baseline security requirement by most cyber insurance carriers. Businesses without it are often denied coverage or charged significantly higher premiums.
EagleOnyx deploys EDR on every managed device as part of the Shield and Command plans.
If you are currently relying on traditional antivirus, we will tell you what you are missing and what it would take to close the gap.
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