If you've spoken to an IT provider or read anything about cybersecurity in the last couple of years, you've probably come across the term “EDR” — endpoint detection and response. It's being pitched as the modern replacement for traditional antivirus, and it's now considered a baseline security control by the Australian Cyber Security Centre (ACSC) and most cyber insurers.
But what is EDR actually doing that antivirus isn't? And does a small business in Sydney with 10 or 20 staff genuinely need it, or is it overkill? This guide answers both questions in plain English.
What Is EDR, Really?
Endpoint detection and response is a category of cybersecurity software that runs on every device in your environment — laptops, desktops, servers — and continuously monitors what's happening on those devices. It records process activity, file changes, network connections, registry edits, and user behaviour, then analyses that data to detect signs of a cyberattack in progress.
When something suspicious is detected, EDR can automatically respond — isolating the device from the network, killing malicious processes, rolling back changes, and alerting a human analyst to investigate. The whole point is to catch and contain an attack while it's happening, rather than discovering it weeks later when the damage is already done.
Modern EDR platforms are typically cloud-managed and backed by a 24/7 security operations centre (SOC) staffed by analysts who triage alerts in real time. When it's paired with that human monitoring layer, you'll often hear it called MDR — managed detection and response.
EDR vs Traditional Antivirus: The Core Difference
Traditional antivirus works by comparing files on your device against a database of known malware signatures. If a file matches a known bad signature, it's blocked. That model worked reasonably well in the early 2000s when malware was relatively static and predictable.
The problem is that modern attacks don't look like that anymore. Attackers now use techniques that traditional antivirus can't see:
- Fileless malware that runs entirely in memory and never writes a file to disk
- Living off the land — abusing legitimate Windows tools like PowerShell, WMI, and scheduled tasks to carry out attacks
- Stolen credentials — logging in as a real user, where there's no “malware” for antivirus to detect at all
- Polymorphic malware that changes its signature every time it runs
EDR is designed to catch these techniques by looking at behaviour rather than signatures. Here's how the two compare:
| Capability | Traditional Antivirus | EDR |
|---|---|---|
| Detection method | Signature matching | Behavioural analysis, machine learning, threat intelligence |
| Fileless attacks | Largely blind | Detects suspicious process behaviour |
| Ransomware | Catches known variants only | Detects encryption behaviour, can roll back changes |
| Investigation data | Minimal — just alerts | Full forensic timeline of what happened |
| Automated response | Quarantine files | Isolate device, kill processes, roll back changes |
| Human monitoring | None | 24/7 SOC analysts (with MDR) |
| Compliance alignment | Below current standards | Meets ACSC Essential Eight, cyber insurance requirements |
The simple way to think about it: antivirus is a bouncer checking IDs against a list of known troublemakers. EDR is a CCTV system with a security guard watching the feed — even if someone gets through the door with a fake ID, the guard sees them behaving suspiciously and responds before any real harm is done.
How EDR Actually Works in Practice
To understand whether EDR is worth the investment, it helps to walk through what happens during a real attack — say, a ransomware incident triggered by a phishing email.
1. Initial compromise
A staff member receives a convincing phishing email, clicks a link, and enters their Microsoft 365 credentials into a fake login page. The attacker now has valid credentials.
2. Foothold
The attacker logs into the staff member's laptop using a remote management tool and downloads a small loader script. Traditional antivirus may not flag this — the tool is legitimate software, and the script is custom.
3. EDR detects anomalous behaviour
EDR notices that a PowerShell process has been spawned by Outlook, is making outbound connections to an unusual IP address, and is attempting to enumerate files across the network. None of these actions on their own are malicious — but combined, the behavioural pattern matches known attack tradecraft.
4. Automated containment
The EDR platform automatically isolates the laptop from the network, kills the suspicious processes, and triggers an alert to the SOC. The attacker loses access within seconds.
5. Investigation and remediation
The SOC analyst reviews the full forensic timeline — exactly which files were touched, which credentials were used, what network connections were made — and works with your IT provider to reset credentials, revoke sessions, and verify nothing else has been compromised.
Without EDR, that same attack typically plays out over days or weeks. The attacker quietly moves laterally, harvests more credentials, exfiltrates data, and finally detonates ransomware across the entire environment on a Friday evening. The first time anyone notices is when staff arrive Monday morning to encrypted files and a ransom note.
What Does EDR Cost for a Sydney SMB?
EDR is sold per device or per user per month. Pricing varies significantly depending on whether you're buying the software alone or the fully managed service with 24/7 SOC monitoring.
| Service Level | Typical Price (per endpoint/month) | What's Included |
|---|---|---|
| EDR software only | $8–$15 AUD | Software, automated detection, alerts to your IT team |
| Managed EDR (MDR) | $20–$40 AUD | EDR software plus 24/7 SOC monitoring and response |
| MDR with threat hunting | $40–$70 AUD | Above plus proactive threat hunting and incident response retainer |
For a 20-person business with 25 endpoints (laptops, desktops, and a server or two) on managed EDR at $30/endpoint, you're looking at roughly $750/month — about $9,000 a year. Compared to the average cost of a ransomware incident affecting an Australian SMB (commonly $50,000 to $500,000+ when you factor in downtime, data recovery, legal fees, and reputational damage), it's a small price for genuine protection.
Does Your Business Actually Need EDR?
For most Sydney SMBs in 2026, the honest answer is yes. Here's how to think about it:
- Cyber insurers are mandating it. Many Australian cyber insurance policies now require EDR as a precondition of coverage. Without it, your claim may be denied — or your premium will be significantly higher.
- The ACSC Essential Eight assumes it. The application control and user application hardening controls effectively require behavioural detection that traditional antivirus can't deliver.
- Attackers target SMBs specifically. Small businesses are seen as soft targets — enough money to pay a ransom, not enough security to stop the attack. SMBs now account for the majority of ransomware victims reported to the ACSC.
- Your clients and suppliers are asking. Vendor security questionnaires increasingly ask “do you use EDR?” — and a “no” answer is starting to cost businesses contracts.
- You handle sensitive data. If you store client records, financial information, or anything covered by the Privacy Act, you have a legal obligation to take reasonable security steps. EDR is now considered reasonable.
The only businesses for whom EDR may genuinely be overkill are very small operations — sole traders or two-person shops with no servers, no shared data, and minimal exposure. Even then, lightweight EDR products are now affordable enough that the calculation usually still favours having it.
Not sure whether your current antivirus or security stack is genuinely protecting you? We'll review your environment and give you an honest answer — no sales pressure.
Book Your Free Assessment →How to Choose an EDR Solution
The EDR market is crowded, and not every product labelled “EDR” delivers genuine behavioural detection. Here are the questions worth asking before you commit:
1. Is there 24/7 human monitoring, or just software?
EDR generates alerts. Without trained analysts watching those alerts around the clock, critical incidents at 2am on a Sunday will sit unaddressed until Monday morning. For most SMBs, managed EDR with a real SOC is the only model that actually delivers on the promise.
2. What is the response SLA for a critical alert?
A good MDR provider will commit to actioning critical alerts within 15 minutes, 24/7. Ask for the SLA in writing, and ask what “actioning” means in practice — automated isolation, analyst review, or just a notification email to your IT team.
3. Does it cover servers and Microsoft 365?
Endpoints aren't just laptops. Servers are where the most valuable data lives, and Microsoft 365 is where most modern attacks now begin. Confirm the EDR covers all three and that identity threats (impossible travel, suspicious sign-ins, mailbox rule changes) are part of the monitoring scope.
4. How is it deployed and managed?
EDR agents need to be installed and kept up to date on every device. Your IT provider should handle deployment, monitor agent health, and ensure no device is left unprotected. Coverage gaps are how attacks succeed.
5. What happens during an actual incident?
Ask the provider to walk you through what they did during a real customer incident in the last 12 months. Genuine providers will have stories. Vague answers usually mean the product is sold but rarely tested in anger.
The Bottom Line
Endpoint detection and response is no longer optional for Sydney businesses that take security seriously. Traditional antivirus was designed for a threat landscape that no longer exists, and the gap between “we have antivirus” and “we're actually protected” has become enormous.
For most SMBs, the right model is managed EDR — software backed by a 24/7 SOC — deployed across every laptop, server, and identity in your environment. It's now an affordable baseline control, a requirement for cyber insurance, and increasingly a contractual expectation from clients and suppliers.
If you're still running standalone antivirus in 2026, you're relying on a control that attackers have been bypassing routinely for the better part of a decade. The good news is that closing that gap is straightforward — and far cheaper than the alternative.