Antivirus vs EDR: What Endpoint Security Does Your Small Business Actually Need?

Walk into any conversation about cybersecurity and someone will mention antivirus. But there's a growing gap between what traditional antivirus can protect against and the threats Australian small businesses are actually facing. Understanding what endpoint security tools do — and which one your business genuinely needs — helps you spend your budget where it counts.

What Traditional Antivirus Does (and Why It's No Longer Enough)

Traditional antivirus software works by comparing files on your computer against a database of known malware signatures. When a file matches a known threat, the software blocks or quarantines it. This approach worked well when most malware was distributed as files and attackers weren't particularly sophisticated.

Today, attackers have adapted. Many modern threats use fileless malware — attacks that run entirely in memory using legitimate system tools like PowerShell, leaving no file on disk for antivirus to scan. Others exploit zero-day vulnerabilities (flaws in software that have no patch yet), meaning there's no signature in the database to match against. Signature-based antivirus simply cannot catch what it doesn't recognise.

What EDR Is and What It Adds

EDR — Endpoint Detection and Response — takes a different approach. Instead of only checking files against a signature database, EDR continuously monitors the behaviour of programs on your device. If a process starts doing something suspicious — like a Word document suddenly trying to reach out to an unknown server, or PowerShell running commands it shouldn't — EDR flags it, even if the specific malware has never been seen before.

EDR also provides:

• Threat hunting capabilities — tools to search across your devices for signs of compromise
• Detailed activity logging — a timeline of what happened on a device so you can investigate incidents properly
• Response tools — the ability to isolate a compromised device from the network remotely, stop processes, and contain damage quickly

What XDR Adds

XDR (Extended Detection and Response) takes the EDR concept further by correlating data not just from endpoints but from email, cloud services, and network traffic. It gives a broader view of an attack that might start in email, move to an endpoint, and then try to exfiltrate data via the network. For most small businesses, XDR is overkill — but it's worth knowing the term as it appears increasingly in vendor marketing.

When Does a Small Business Genuinely Need EDR?

EDR is worth prioritising when:

• You handle sensitive customer data, financial records, or health information
• Your business has been targeted before or operates in a high-risk industry
• You have remote staff accessing company systems regularly
• You manage more than 10 devices and need centralised visibility across all of them

If you're a sole trader with two devices, good patching habits, MFA on all accounts, and staff who know what phishing looks like, a strong traditional AV product combined with those controls may be sufficient. The controls around endpoint security — patching, MFA, access control — matter just as much as the tool itself.

Microsoft Defender: Is It Actually Good Enough?

Windows Defender (built into Windows 10 and 11) has improved dramatically over the past several years. In independent tests, it consistently scores well against both known malware and newer threats. The consumer version that ships free with Windows is a reasonable baseline.

However, for business use, the more relevant product is Microsoft Defender for Business, which adds EDR capabilities, centralised management across all your devices, vulnerability scanning, and automated investigation of alerts. It's available as a standalone subscription or included in Microsoft 365 Business Premium. For most small businesses already in the Microsoft 365 ecosystem, it's a strong and cost-effective choice.

Recommended Endpoint Security Options for SMBs

• Microsoft Defender for Business — best value if you're already using Microsoft 365. EDR capabilities, centralised dashboard, straightforward to deploy.
• CrowdStrike Falcon Go — lightweight, highly effective, cloud-managed EDR. More expensive than Defender but strong detection performance.
• Malwarebytes for Teams — easy to manage, good for small teams, strong at catching threats that slip past other tools. Works alongside Windows Defender.
• Sophos Intercept X Essentials — good mid-market option with anti-ransomware and exploit prevention features.

Whichever product you choose, endpoint security is only one layer. Keep your operating systems and applications patched, enforce MFA on every account that supports it, and make sure staff know how to recognise suspicious messages. A well-configured Defender for Business installation with good patching habits will outperform a poorly-managed premium EDR product every time.