What Is Endpoint Detection and Response and Do You Need It?

The Problem with Traditional Antivirus

For most of the history of personal computing, antivirus software worked by comparing files against a database of known malware signatures. If a file matched a known threat, it was blocked or quarantined. If it did not match, it was assumed safe.

This approach has a fundamental weakness: it only stops threats that have been seen before. Modern cybercriminals routinely use custom-built or modified malware specifically designed to avoid signature detection. Traditional antivirus misses a significant proportion of current threats.

What EDR Does Differently

Endpoint Detection and Response (EDR) takes a fundamentally different approach. Instead of — or in addition to — signature matching, EDR monitors behaviour on the device continuously. It watches what processes are running, what files they are accessing, what network connections they are making, and how they are behaving.

When behaviour looks suspicious — a document application attempting to encrypt hundreds of files in sequence, a browser process trying to access the Windows credential store, a script executing code from an unusual location — the EDR agent raises an alert and, in many cases, automatically contains the threat.

This behavioural approach allows EDR to detect and stop threats that have never been seen before, including new ransomware variants, zero-day exploits, and custom-built malware.

EDR vs Antivirus: The Practical Difference

Many modern security solutions combine both — traditional antivirus for known threats and behavioural EDR for everything else.

Do Small Businesses Need EDR?

The short answer for most businesses is yes. The reasons:

• Ransomware attacks against small businesses have increased significantly over the past three years
• Many ransomware variants are specifically designed to evade signature-based detection
• The cost of a ransomware recovery — data restoration, downtime, forensics, potential ransom — typically far exceeds the annual cost of EDR protection
• Microsoft 365 Business Premium includes Microsoft Defender for Business, which is a genuine enterprise-grade EDR solution, as part of the plan

For Gold Coast and Brisbane businesses that have already moved to Microsoft 365 Business Premium, Defender for Business is included and just needs to be configured correctly. For businesses on other plans, third-party EDR solutions such as Huntress, SentinelOne, or Bitdefender GravityZone provide equivalent protection.

What Good EDR Configuration Looks Like

An EDR licence is not the same as a properly deployed and configured EDR solution. Effective deployment includes:

• Agent installed on every endpoint — including servers, not just workstations
• Detection policies reviewed and tuned for the environment
• Alerts monitored — either by internal staff or by a managed security provider
• Incident response procedures documented so the team knows what to do when an alert fires

How EDR Works in Practice: Behavioural Detection

The core difference between EDR and traditional antivirus is the detection method. Traditional antivirus matches file signatures — a database of known malware. If the malware has never been seen before, or has been modified to change its signature, it is not detected.

EDR monitors what processes actually DO, not just what they look like. When a Microsoft Word document opens PowerShell and PowerShell then attempts to reach out to a server in Eastern Europe while encrypting files — EDR sees that chain of behaviour as suspicious, even if the individual components are not on any signature blacklist. It can stop the attack mid-execution and alert your IT team.

This behavioural approach is why EDR is effective against:

• Novel malware that has never been seen before
• Fileless attacks that run entirely in memory without writing a file to disk
• Living-off-the-land attacks that use legitimate Windows tools maliciously
• Ransomware — which typically shows distinctive behavioural patterns before encryption completes

The Specific EDR Tools Australian Small Businesses Use

Two EDR solutions dominate the Australian SMB market:

Microsoft Defender for Business. Included in Microsoft 365 Business Premium, this is the most common EDR for businesses already on Microsoft 365. It provides full EDR capability — threat detection, automatic investigation, and response actions — integrated with the Microsoft security stack. For businesses already paying for Business Premium, there is no additional licence cost.

Crowdstrike Falcon Go / SentinelOne Singularity. Standalone EDR platforms that work independently of Microsoft 365. Appropriate for businesses not on Microsoft 365, or for those who want an independent security layer. Priced per device per month.

For most Gold Coast and Brisbane small businesses on Microsoft 365 Business Premium, Microsoft Defender for Business provides strong EDR capability at no additional cost. The key requirement: it must be properly configured and deployed — an unconfigured Defender for Business is not protection.

EDR vs Antivirus: When Antivirus Is Not Enough

Traditional antivirus still has a role — it catches known malware efficiently and cheaply. But the threat landscape has moved beyond what antivirus alone can address. Here are the scenarios where antivirus consistently fails and EDR succeeds:

Ransomware with novel variants. Ransomware developers regularly modify their code to evade antivirus signature detection. EDR detects the ransomware behaviour (file encryption, shadow copy deletion, C2 communications) regardless of whether the specific code has been seen before.

Business email compromise with a malicious attachment. An attacker sends a document with embedded malicious code (a macro or an exploit) to a staff member. Antivirus may miss it. EDR catches the subsequent behaviour — PowerShell execution, network connections, persistence mechanisms.

Insider threat or compromised credential. A legitimate user account being used maliciously is transparent to antivirus (the user is authenticated). EDR can detect unusual behaviour patterns — data exfiltration, access to unusual file locations — that suggest account compromise.

Do You Need EDR? The Self-Assessment

Your business needs EDR if any of the following are true:

• You handle client data that would be harmful if disclosed (financial, health, legal)
• You hold payment card information or process payments
• Your business operations would be severely disrupted by ransomware
• You are in a regulated industry (healthcare, financial services, legal)
• You have staff who regularly click links in emails or download attachments from external sources

For most Gold Coast and Brisbane small businesses above five staff, the answer to most of these is yes. EDR is no longer an enterprise-only technology — it is a standard component of small business cyber security.

Netluma IT deploys and manages EDR for SE Queensland clients. Call 1300 521 162 to discuss what protection your specific environment needs.

Netluma IT deploys and monitors EDR for all managed clients across SE Queensland. Call 1300 521 162 to discuss what endpoint protection looks like for your business.