Most small businesses have antivirus software on their computers. Ten years ago, that was enough. It is not anymore.
The threats have changed. Attackers no longer rely on known viruses that antivirus can recognise. They use fileless attacks, stolen credentials, and legitimate system tools turned against you. Traditional antivirus, the kind that scans for known threats, misses most of this. Endpoint security, specifically EDR (endpoint detection and response), watches for suspicious behaviour instead of just matching signatures. It is the difference between a security guard who checks IDs at the door and one who monitors the entire building for anything unusual.
This is not a product pitch. It is a plain English explanation of what each one does, where antivirus falls short, and how to think about endpoint security for your business.
How Traditional Antivirus Works
Antivirus software works by matching files against a database of known threats. When you download a file or open an attachment, the antivirus checks it against a list of signatures, digital fingerprints of malware that has been identified and catalogued.
If the file matches a known signature, it gets blocked or quarantined. If it does not match anything in the database, it is allowed through.
This approach worked well when most threats were known viruses distributed through email attachments and infected USB drives. The antivirus vendor would discover a new virus, add its signature to the database, push an update, and every computer running that antivirus would be protected.
The problem is that attackers adapted. Modern threats are designed to avoid signature detection. They change their code with every deployment so no two copies look the same. They use legitimate Windows tools to carry out attacks, so there is no malicious file to scan. They steal valid credentials and log in as if they were an authorised user.
Against these methods, traditional antivirus is effectively blind.
What Endpoint Detection and Response (EDR) Does Differently
EDR does not rely on a list of known threats. Instead, it monitors what is happening on each device, every process, every connection, every file change, and looks for behaviour that does not fit normal patterns.
For example, if a legitimate Windows tool suddenly starts encrypting files at high speed, antivirus would not flag it because the tool itself is not malware. EDR would recognise the behaviour as consistent with ransomware and intervene.
Here is what EDR typically provides that antivirus does not:
- Behavioural detection. Identifies threats based on what they do, not what they look like. This catches zero-day threats, attacks that exploit vulnerabilities before a patch exists.
- Device isolation. If a device is compromised, EDR can cut it off from the network automatically to prevent the attack from spreading to other machines.
- Forensic data. EDR records a detailed timeline of what happened on a device, which is critical for understanding how an attack occurred and what data was affected.
- Real-time alerting. Your IT team or provider gets notified immediately when something suspicious is detected, not hours or days later.
Think of it this way: antivirus is a lock on the front door. EDR is a security system that watches every room, alerts you to unusual activity, and can lock down a section of the building if something goes wrong.
Why Antivirus Alone Is Not Enough Anymore
The Australian Cyber Security Centre (ACSC) publishes the Essential Eight, a set of eight security controls that address the most common ways businesses get compromised. Application control and restricting admin privileges are on that list. Simply running antivirus is not.
That should tell you something about where the baseline has moved.
Consider the most common attack paths for small businesses today. Phishing emails that trick a staff member into entering their password on a fake login page. Stolen credentials from a data breach at another service. Remote access tools left exposed to the internet. None of these involve a traditional virus. Antivirus would not catch any of them.
EDR does not catch everything either, nothing does. But it significantly reduces the window between an attacker gaining access and your team knowing about it. In most small business breaches, the attacker has been inside the network for days or weeks before anyone notices. EDR shrinks that window to minutes.
What to Look for in Endpoint Security
If you are evaluating endpoint security for your business, here are the things that matter:
Managed vs unmanaged. EDR generates alerts. Someone needs to watch those alerts and respond. If you do not have an internal IT team monitoring around the clock, you need a managed EDR service where your IT provider handles detection and response.
Coverage. Every device that connects to your network needs protection, laptops, desktops, servers, and mobile devices. One unprotected machine is an entry point.
Integration with your security stack. EDR works best when it is part of a broader security approach that includes patch management, MFA (multi-factor authentication, requiring a second verification step to log in), and tested backups. No single tool protects you on its own.
Reporting. You should be able to see what threats were detected, what actions were taken, and what the overall security posture of your devices looks like.
Where to Start
If you are still running standalone antivirus across your business, you are carrying more risk than you need to. That does not mean you need to rip everything out tomorrow. It means you need to understand what your current security baseline looks like and where the gaps are.
An IT Audit gives you that picture. It is a one-off assessment for $990 that reviews your current setup, identifies what is missing, and gives you a prioritised list of what to address first.
