Endpoint Detection and Response (EDR) explained: a guide for Australian SMEs

Endpoint detection and response (EDR) is a category of security software that monitors laptops, desktops, and servers in real time, looking for the patterns that indicate a cyber attack in progress. Unlike traditional antivirus, which checks files against a list of known threats, EDR watches what programs actually do and flags suspicious behaviour even when the software responsible has never been seen before.

For Australian SMEs in 2026, EDR has shifted from a nice-to-have to an expected baseline control. Cyber insurance underwriters now ask for it. Microsoft, Sophos, CrowdStrike, and SentinelOne all sell business-grade EDR at SME-accessible price points. This guide explains what EDR actually does, how it differs from antivirus, what to look for in an EDR product, and how it fits with managed detection and response (MDR) for businesses that don't have a 24/7 security team.

Key facts

• EDR (endpoint detection and response) is behaviour-based security software that watches what programs do on a device, not just what files look like.
• EDR catches threats that traditional antivirus misses: fileless attacks, living-off-the-land techniques, novel malware, and lateral movement after a phishing compromise.
• Business-grade EDR for Australian SMEs typically costs AU$10 to AU$30 per endpoint per month ex GST, depending on the product and whether managed response is included.
• MDR (managed detection and response) layers a 24/7 security operations team on top of EDR, taking action on alerts the SME's internal team would otherwise have to handle.
• Cyber insurance underwriters in Australia now commonly require EDR (or specifically next-gen antivirus with behavioural capabilities) as a precondition for coverage.
• The ACSC Essential Eight does not name EDR directly, but achieving Maturity Level 2 across the eight controls effectively requires EDR-class capability.

What is endpoint detection and response (EDR)?

EDR is the generational shift from signature-based antivirus to behaviour-based threat detection. Traditional antivirus works by maintaining a database of known malicious files (signatures) and checking every file on the device against that database. If a file matches a known signature, the antivirus blocks or quarantines it. The model worked well in the 1990s and 2000s when malware was a relatively small set of identifiable files. It works poorly in 2026 when modern attacks rarely involve files that look obviously malicious.

EDR takes a different approach. Instead of asking "is this file on the bad list", it asks "is this program doing something a legitimate program shouldn't do". A Microsoft Word process that starts a PowerShell session, downloads a script from the internet, and tries to encrypt the user's documents is doing something Word should never do, even if every file involved looks technically clean. EDR sees the behaviour pattern and stops it.

The "response" half of EDR is the action taken when something suspicious is detected. EDR products can quarantine the affected device automatically, kill the malicious process, roll back changes the process made, and alert security analysts. The level of automated response varies by product and configuration, with more aggressive automation reducing time-to-contain but increasing the risk of disrupting legitimate work.

How is EDR different from antivirus?

The simplest way to think about it: antivirus is reactive (block known threats), EDR is proactive (detect unknown threats by behaviour). Most modern security products marketed as antivirus are actually hybrid products that include both capabilities, but the underlying distinction matters because it tells you what the product actually catches.

Aspect	Traditional antivirus	EDR
Detection method	File signatures against known bad list	Behavioural analysis of running programs
Catches novel malware	Only after signatures are updated	Yes, based on suspicious behaviour
Catches fileless attacks	No (no file to scan)	Yes (watches process behaviour)
Catches living-off-the-land techniques	No (legitimate tools used)	Yes (anomalous use of legitimate tools)
Forensic capability	Minimal (file list)	Extensive (process trees, network connections, timeline)
Storage requirements	Small (signature database)	Larger (behavioural telemetry)
Typical cost per endpoint	AU$3 to AU$8 per month	AU$10 to AU$30 per month
Suits	Almost no SME alone in 2026	Every SME running business-critical workloads

The honest commercial picture in 2026: standalone traditional antivirus is no longer sufficient for any Australian business handling customer data or running business-critical workloads. The price difference between basic antivirus and EDR has narrowed enough that the cost case for sticking with signature-only protection has effectively disappeared.

What does EDR catch that antivirus misses?

Four attack patterns explain most of what EDR detects and antivirus misses. Understanding them is the easiest way to see why EDR has become the baseline expectation.

Fileless attacks. An increasing share of modern attacks doesn't drop a malicious file to disk at all. The attack code runs entirely in memory, often inside a legitimate process the user already trusts (PowerShell, Microsoft Office macros, browser memory). Antivirus has nothing to scan because there's no file. EDR sees the anomalous behaviour of the process and responds.

Living-off-the-land techniques. Attackers increasingly use tools that are already installed on the target system: PowerShell, Windows Management Instrumentation, Microsoft Sysinternals utilities. These tools are legitimate and present on every Windows system. Antivirus can't block them without breaking Windows. EDR distinguishes between routine administrative use of these tools and anomalous patterns that suggest an attacker is using them for reconnaissance or lateral movement.

Novel malware. Ransomware groups now generate unique malware variants for each campaign, sometimes for each victim. Signature-based antivirus cannot keep pace with the volume of new variants. EDR detects the encryption behaviour, the privilege escalation, the lateral movement, regardless of which specific malware variant is involved.

Lateral movement after initial compromise. The vast majority of significant breaches involve a successful initial compromise (often phishing) followed by attacker movement through the environment. The initial compromise might be just a credential theft, with no malware involved. EDR sees the subsequent behavioural patterns (Remote Desktop connections to systems the user has never accessed, mass file access patterns, suspicious authentication attempts) and raises alerts that surface the broader campaign before encryption or exfiltration begins.

What is MDR (managed detection and response)?

EDR generates alerts. Alerts require human judgement to investigate, prioritise, and act on. For a 30-person Australian SME, the people who would do that work either don't exist internally, or they're the same people running helpdesk, or they're trying to do it after hours when they're tired. Most SMEs that buy EDR without managed response struggle to actually act on what it tells them.

MDR (managed detection and response) solves this by adding a 24/7 security operations team that monitors the EDR alerts, investigates suspicious activity, and takes containment action when needed. The SME continues to own the EDR product; the MDR provider operates it on the SME's behalf. When something serious happens at 2am, the MDR team responds. When ambiguous activity appears that needs context, the MDR team investigates and recommends action.

For Australian SMEs without a dedicated security team, MDR is increasingly the way EDR gets implemented. The combined cost (EDR plus MDR) typically lands at AU$25 to AU$60 per endpoint per month ex GST, depending on the provider and the response capability included. Compared to the cost of an in-house security analyst (well over AU$130,000 per year loaded for one analyst, who can't cover 24/7 anyway), MDR is structurally cheaper and structurally more capable.

Most managed services providers in Australia offer MDR as an add-on to their managed services agreement, either bundled with EDR from a specific vendor (Sophos, SentinelOne, CrowdStrike, Microsoft Defender for Business) or as a vendor-agnostic service layered on whatever EDR the client prefers.

Do Australian SMEs really need EDR?

Four tests determine whether EDR is appropriate for a specific Australian SME. If any of them resolve to yes, EDR is the right answer.

Test 1: Does the business hold customer data? Customer names, contact information, financial details, health information, or anything else that would trigger a Notifiable Data Breach assessment if exposed. If yes, EDR is appropriate because the consequence of a compromise that you don't detect quickly includes regulatory exposure under the Privacy Act 1988.

Test 2: Is the business dependent on operational continuity? Would a 4-day ransomware-driven outage threaten the business? For most SMEs above 10 staff, the answer is yes. EDR significantly reduces the chance of a ransomware event reaching the encryption stage by catching the precursor behaviours.

Test 3: Does the business carry cyber insurance, or want to? Australian cyber insurance underwriters in 2026 commonly require EDR as a baseline control. Policies for businesses without EDR are either declined, priced punitively, or come with carve-outs that exclude the most likely incident types.

Test 4: Does the business have contractual security obligations to customers or partners? Government supply chain, APRA-regulated entity supply chain, healthcare suppliers, professional services with sensitive client matters. Customer security questionnaires increasingly ask "do you run EDR" as a yes/no question that gates the relationship.

For businesses that resolve "no" on all four tests, traditional antivirus may still be defensible, but the category is narrowing each year as the threat landscape and regulatory environment shift. The honest pattern is that EDR became baseline for SMEs above 10 staff around 2023-2024, and the holdouts since then are increasingly outliers.

What should an SME look for in an EDR product?

Five criteria separate fit-for-purpose SME EDR products from enterprise products dressed up for the SME market.

Australian or globally-mature presence. The major Australian-market EDR products in 2026 are Microsoft Defender for Endpoint (bundled in Microsoft 365 Business Premium), Sophos Intercept X, SentinelOne Singularity, and CrowdStrike Falcon. All four are mature, well-supported in Australia, and have meaningful Australian partner ecosystems. Smaller or less-known products may be cheaper but carry support and continuity risk for an SME.

Sensible default policies. Some EDR products require extensive tuning before they're useful. Others ship with strong default policies that protect immediately and can be customised as needed. For SMEs without dedicated security staff, the default-policy quality matters substantially.

Available with MDR. Even if you don't engage MDR initially, the product should support the option. EDR products that don't have a strong MDR ecosystem lock you into self-managing alert response, which doesn't scale.

Integration with existing tooling. If the business runs Microsoft 365 and Intune, Microsoft Defender integrates natively. If the business runs a different stack, integration with your existing identity provider, SIEM (if applicable), and ticketing system matters more than the EDR product's marketing claims.

Pricing transparency. SME-suitable EDR products publish pricing or make it easily quotable. Enterprise products that require multiple conversations to extract pricing are typically not fit for SME engagement, regardless of how good the technology is.

Frequently asked questions

Is Microsoft Defender for Business enough, or do we need a third-party EDR?

Microsoft Defender for Business, included in Microsoft 365 Business Premium, is a genuine EDR product and adequate for many Australian SMEs. It has the same behavioural detection engine as Defender for Endpoint (used in larger Microsoft customers) with simplified management appropriate for businesses up to 300 staff. Third-party EDR products may offer specific capabilities (different telemetry, different MDR ecosystems, multi-OS depth) that justify the additional cost, but Defender for Business is not a stripped-down product. It's a credible baseline.

Can EDR slow down our devices?

Modern EDR products run with minimal performance impact on contemporary hardware (Windows 10/11 laptops from 2020 onwards, Apple Silicon Macs, modern servers). On older hardware (Windows 10 laptops from 2017 or earlier, end-of-life servers), the impact is more noticeable. Performance is rarely the right reason to defer EDR deployment in 2026; aging hardware that struggles with EDR is also struggling with the operating system itself and is overdue for refresh.

What happens when EDR raises a false positive?

False positives are inevitable with any behavioural detection. Good EDR products provide a workflow to investigate the alert, exclude the activity if it's legitimate (typically by approving the specific process and parent context, not just adding the file to an allowlist), and apply the exclusion across the fleet. MDR providers handle this work as part of the service. For self-managed EDR, the SME's IT person handles it, with the volume of false positives diminishing as the environment is tuned.

Does EDR replace our backup strategy?

No. EDR reduces the likelihood of a ransomware event reaching the encryption stage, but doesn't replace the need for verified backups. The two controls work in different layers: EDR is detection and prevention; backup is recovery if prevention fails. A complete cybersecurity baseline includes both, plus MFA, plus patching, plus user training. EDR alone is not a substitute for the broader Essential Eight program.

How long does EDR take to deploy?

For an SME with cloud-managed devices (Intune-enrolled Windows laptops, Jamf-managed Macs), EDR deployment typically completes within 1 to 3 days for the bulk of the fleet. Servers and edge cases take longer. The deployment itself is fast; the tuning to reduce false positives and adjust policies takes 2 to 6 weeks of operational use. Most of the value is realised immediately after deployment; the tuning makes operations smoother but doesn't dramatically change the protection level.

What's the difference between EDR and XDR?

XDR (extended detection and response) takes the EDR concept and extends it across multiple security data sources: endpoint, email, cloud workload, identity, network. The pitch is that correlating signals across these sources catches attacks that endpoint visibility alone would miss. For larger enterprises with dedicated security teams, XDR is becoming the next-generation baseline. For most Australian SMEs in 2026, XDR is overkill, and EDR plus selected complementary controls (Microsoft Defender for Office 365 for email, Conditional Access for identity) is the better fit.

If your business is still on traditional antivirus and you're trying to work out whether the EDR upgrade is now warranted, that's a 15-minute conversation worth having. We can run through your specific exposure and what the upgrade actually looks like in practice for a business your size.