Every computer in your office probably has antivirus on it. Then an insurer, a client contract or an IT provider mentions EDR, and the question comes up: is antivirus no longer enough, and is EDR just a more expensive version of the same thing?
They overlap, but they do different jobs. Knowing the difference helps you decide what you need and, just as important, who is going to act when something is found.
What antivirus does
Traditional antivirus looks at files and compares them against known threats. Modern products also use some behavior checks and cloud lookups, but the core idea is the same: spot something bad and block or quarantine it.
That still catches a lot of common malware. Its limits show up with attacks that do not drop an obvious malicious file. An attacker who logs in with a stolen password and uses normal Windows tools, such as PowerShell or remote desktop, may not trip anything at all. Antivirus also tends to give you a yes-or-no result with little detail about what happened before or after.
What EDR adds
Endpoint detection and response (EDR) records activity on each device: processes starting, network connections, changes to files and settings, sign-ins. It looks for patterns that suggest an attack, even when each single step looks harmless.
- Behavior detection: for example, an Office document launching a script that then contacts an unknown server, or a program encrypting many files quickly.
- Investigation: a timeline showing how something started and what it touched, which helps answer "was anything else affected?"
- Response: isolating a computer from the network, killing a process, or rolling back changes, often remotely and in minutes.
Many current business security products combine antivirus and EDR in one agent. Microsoft Defender Antivirus is built into Windows, and Microsoft 365 Business Premium includes Microsoft Defender for Business, which adds EDR features. Other vendors offer similar products.
The part people miss: someone has to watch it
EDR produces alerts. Some are serious, many are minor, and a few are false alarms. If nobody looks at them, an EDR product is not much better than antivirus. Attacks often happen at night or on weekends, when no one in the office is watching email.
This is where managed detection and response (MDR) comes in. A security team monitors the alerts, investigates, and takes action, such as isolating a laptop, according to rules you agree on in advance. For most small businesses without in-house security staff, this matters more than which brand of EDR is installed.
How to decide what you need
- List your devices. Laptops, desktops and servers, including the old PC in the back running one piece of software.
- Check what is installed and whether it is on every device. Gaps are common, especially on servers and machines set up years ago.
- Ask who sees the alerts and what they do with them. If the answer is "nobody" or "they go to an inbox", that is the first thing to fix.
- Look at your requirements. Cyber insurance forms and client security questionnaires often ask specifically about EDR and monitoring.
- Agree on response rules. Decide in advance whether a provider can isolate a device without calling you first, and who they contact.
A business with a handful of computers, strong MFA and good backups may manage with well-configured built-in protection and someone checking it. A business holding client financial, medical or legal data usually needs EDR with active monitoring.
EDR is one layer
EDR protects devices. It does not replace MFA on accounts, email filtering, patching or backups that attackers cannot delete. Many incidents start with a stolen Microsoft 365 password and never touch a laptop. Our post on MFA fatigue and token theft covers that side.
Getting help
If you are not sure what is protecting your computers or who would respond to an alert, we can review it with you. Our SOC and MDR service provides monitored detection and response, and our cybersecurity services cover the other layers. Creative IT USA works with businesses across Los Angeles County, the Inland Empire and Ventura County.