“We have antivirus” is one of the most common, and most outdated, security assumptions a small business can make. Antivirus still has a job to do. However, it was built to catch attacks that become less common every year. EDR solutions cover the much larger gap that traditional antivirus cannot close.

This post breaks down what EDR actually is and how it differs from antivirus. It also explains whether a small business really needs EDR or if antivirus alone is still enough.

What Is Endpoint Detection and Response (EDR)?

Endpoint detection and response, or EDR, is a security tool that continuously monitors laptops, desktops, and servers for suspicious behaviour. It looks beyond known malware and can automatically respond to contain a threat before it spreads.

Instead of checking files against a list of known bad signatures, EDR watches how programs and users behave. It can flag activity that looks suspicious even when nothing matches a known virus.

That distinction matters more than it might sound. A growing share of real attacks don’t use traditional malware files at all.

How Traditional Antivirus Actually Works

Traditional antivirus relies on signature-based detection. It compares files on your system against a database of known malware signatures. It then blocks or quarantines anything that matches.

This approach is fast, low-maintenance, and still genuinely useful against common, well-documented threats.

However, its core limitation comes from how it works. If an attack doesn’t use a file that matches a known signature, antivirus has nothing to compare it against. As a result, it may not see the attack happening at all.

Where Antivirus Falls Short, and Why EDR Cyber Security Matters

This isn’t a theoretical gap. According to CrowdStrike’s 2025 Global Threat Report, based on the company’s own global customer telemetry, 79 percent of detected attacks in 2024 didn’t use malware at all.

Instead, attackers relied on stolen credentials and legitimate system tools to move around undetected. A large majority of real attacks can therefore look like normal activity to tools that only watch for known bad files.

This is exactly the gap EDR cybersecurity aims to close. EDR watches behaviour rather than just file signatures. Because of that, it can catch an attacker using a stolen password to move through your network.

EDR vs. Antivirus: Side-by-Side

• Detection method: antivirus matches known file signatures; EDR analyzes behavior in real time.
• Catches fileless and credential-based attacks: antivirus generally cannot; EDR is built specifically for this.
• Response capability: antivirus blocks or quarantines a file; EDR can investigate, contain, and help remediate an active incident.
• Visibility: antivirus tells you something was blocked; EDR shows what happened, how it happened, and what to do next.
• Maintenance: antivirus runs largely on its own; EDR benefits from skilled monitoring to interpret alerts and respond effectively.

Does EDR Replace Antivirus Completely?

Not exactly. Most modern EDR solutions include signature-based scanning as part of a broader detection engine. You’re not choosing one over the other. Instead, you’re layering deeper detection on top of the basics.

Signature-based scanning still catches common, well-documented malware efficiently. This also reduces the noise that behavioural analysis needs to sort through.

There’s also a compliance angle worth knowing. Some frameworks, including PCI DSS version 4.0, still explicitly require antivirus or anti-malware protection as part of a compliant security programme.

A business therefore can’t simply swap antivirus for EDR when it needs to meet that standard. In practice, most small businesses run both together rather than choosing between them.

What Managed EDR Actually Looks Like Day to Day

Buying an EDR tool and getting value from it are two different things. EDR generates a constant stream of behavioural alerts. Without someone actively watching, investigating, and responding to those alerts, the tool may become an expensive solution nobody has time to use properly.

Managed EDR puts a team behind those alerts. The team monitors activity around the clock, separates real threats from noise, and responds when something looks like a genuine incident.

That means your business gets active protection instead of simply installing software and hoping someone notices an alert eventually.

Does Your Small Business Actually Need EDR Solutions?

Given that a large majority of real attacks now avoid traditional malware entirely, a small business relying on antivirus alone has a real, measurable blind spot, not just a theoretical one. EDR solutions matter more, not less, for small businesses, since a small business is also less likely to have someone watching logs and unusual activity manually the way a larger security team might.

How Zia Networks Delivers Managed EDR

Zia Networks partners with Huntress, a leading managed EDR provider, to deliver behavioral threat detection and response as part of our managed cybersecurity plans. Our team monitors alerts continuously, so a suspicious login or unusual behavior gets investigated and contained quickly, not discovered days later during a routine check.

That means your business gets enterprise-grade endpoint detection and response without needing to hire or train a dedicated security team to manage it.

FAQs

1. What are EDR solutions, in simple terms?

A: EDR solutions continuously monitor computers and servers for suspicious behavior and can automatically respond to contain a threat, going beyond antivirus’s approach of only blocking files that match known malware signatures.

2. What does EDR stand for?

A: EDR stands for Endpoint Detection and Response, a category of security tools that monitor endpoint devices for threats and help respond to them in real time.

3. Is EDR better than antivirus?

A: EDR and antivirus serve different, complementary purposes rather than one simply being better. Antivirus efficiently catches known malware; EDR catches the fileless, credential-based attacks that make up the majority of modern breaches. Most businesses benefit from running both together.

4. What is managed EDR, and why would I need it instead of just installing the software?

A: Managed EDR means a team actively monitors and responds to the alerts EDR software generates. Without active monitoring, EDR alerts often go unreviewed, since interpreting and responding to them requires ongoing attention most small businesses don’t have in-house.