Most small businesses believe they're protected because they have antivirus. Windows Defender is running, they paid for a well-known security suite, they've ticked the box. And in a world where threats are simple, signature-based, and well-documented, that might have been enough.
The world has changed. Attackers don't rely on malware that antivirus databases already know about. They use fileless attacks that run directly in memory. They exploit legitimate software to move laterally across networks. They sit quietly inside a compromised account for weeks before doing anything detectable. By the time a traditional antivirus product sees something it recognises as a threat, the damage is often already done.
Endpoint detection and response — EDR — is the category of security tooling built for this threat landscape. And the gap between businesses that have it and businesses that don't has never been more consequential.
What antivirus actually does — and where it falls short
Traditional antivirus works by comparing files and processes against a database of known malicious signatures. When something matches, it's blocked or quarantined. The underlying assumption is that the threat is known and documented before it reaches you.
This model has two fundamental weaknesses. First, it requires the threat to already exist in the database — zero-day attacks and novel malware pass straight through. Second, it only looks at files and processes, not at behaviour. An attacker using legitimate tools (PowerShell, Remote Desktop, built-in Windows administrative functions) to move through your systems doesn't trigger a signature match, because those tools aren't malicious. It's how they're being used that's the problem.
"The most dangerous attacks don't use files that antivirus can detect. They run in memory, use your own tools against you, and behave like normal activity until they don't."
What endpoint detection and response actually does
EDR takes a fundamentally different approach. Instead of matching against a database of known threats, it monitors behaviour continuously — recording what processes are running, what files are being accessed, what network connections are being made, what commands are being executed — and looks for patterns that indicate something malicious is happening, even if the specific threat has never been seen before.
The key capabilities that distinguish EDR from traditional antivirus are:
Continuous monitoring and visibility
EDR agents run continuously in the background of every protected device, recording what's happening. This creates a timeline of activity that security analysts can review. When something suspicious occurs, there's a complete record of what led up to it — which account was used, what files were accessed, what connections were made. This context is what makes effective response possible.
Behavioural detection
Rather than waiting for a known threat signature, EDR identifies suspicious patterns: a user account accessing an unusual number of files in quick succession (ransomware behaviour), a legitimate system tool being used to execute unusual commands (living-off-the-land attack), a process trying to disable security software (attacker covering their tracks). These patterns trigger alerts regardless of whether the specific technique has been seen before.
24/7 SOC monitoring
The best EDR solutions for small businesses aren't just software — they come with a security operations centre that reviews alerts around the clock. This matters because the difference between a contained incident and a full breach often comes down to response time. An alert that sits in a dashboard until Monday morning can mean three days of undetected attacker activity. Human analysts reviewing alerts continuously means the response time is measured in minutes, not days.
The industry benchmark for mean time to respond (MTTR) for a managed EDR service is under 60 minutes. The best providers achieve this consistently — with human analysts who investigate alerts, confirm whether they're genuine, and act before attackers can escalate their access.
Isolation and containment
When a genuine threat is confirmed, EDR can isolate the affected device from the network — blocking it from communicating with anything except the security team — while investigation and remediation happens. This containment step is what prevents a single compromised laptop from becoming a whole-company incident.
EDR is included in every GetBulwark managed service
Every managed client gets enterprise-grade endpoint detection and response on every device — 24/7 SOC monitoring included. No add-ons. No extra cost per device category. One price, one stack.
See what's includedWhy small businesses specifically need this
There's a persistent myth that small businesses aren't targeted — that attackers focus on large enterprises with more to steal. This is demonstrably false. Small businesses are frequently targeted precisely because they're easier: fewer controls, less monitoring, no dedicated security team to notice unusual activity, and often a connection to a larger organisation that makes them useful as a stepping stone.
Ransomware groups in particular run highly automated campaigns that target thousands of small businesses simultaneously. They're not choosing you specifically — they're running a scan of the internet looking for businesses with specific vulnerabilities, and deploying attacks to every one they find. Company size doesn't exempt you from being in that scan.
The argument against EDR for small businesses used to be cost. Enterprise security software came at enterprise prices. That's no longer true. The managed security market has created EDR solutions specifically built for small businesses — pay-as-you-go pricing, no minimum seat counts, designed to be managed by a single IT person or outsourced to a managed provider.
What EDR doesn't replace
EDR on every endpoint is a necessary component of a complete security stack — not the whole stack on its own. It works alongside:
- MFA on all accounts — EDR can detect and contain a compromised device; MFA prevents account takeover from stolen credentials in the first place.
- Email security controls (SPF, DKIM, DMARC, email scanning) — most attacks arrive via email; endpoint protection handles what gets through, but good email security reduces what reaches devices in the first place.
- Patch management — unpatched software vulnerabilities are a primary attack vector; EDR detects exploitation attempts, but patches prevent the vulnerability from being exploitable at all.
- Data backup — if ransomware encrypts your files before EDR containment, a clean backup is what gets you back up and running without paying a ransom.
A properly secured Google Workspace business has all four of these working together, plus EDR on every device. Any gap in the chain creates an attack path that the other controls don't fully close.
