Antivirus vs. EDR: Stop Choosing, Start Combining

I once worked with a startup that ditched antivirus completely, thinking EDR was the future. Three months later, a wave of commodity ransomware hit their sales team's laptops. EDR caught it, but only after several machines were already encrypted. Their backups saved them, but they lost a day of work and a lot of sleep.

The mistake? They believed the hype that AV is obsolete. It's not.

Antivirus still does something crucial: it blocks the everyday malware that hasn't changed in years. Think of it as a bouncer at the door, checking IDs. It catches the known bad guys—the ones on the list. CISA's guidance on ransomware is clear: AV is prevention-focused, detecting and removing known malware by signature. That's still valuable. You wouldn't stop locking your car just because you have a security camera, would you? Same idea.

EDR, on the other hand, is like having a security team inside the building. It watches everything, looking for suspicious behavior—someone wandering into the server room at 3 AM, a process acting weird. It uses behavioral analysis and machine learning to spot threats that have no signature: fileless attacks, zero-days. And when it catches something, it can isolate the endpoint, kill the process, grab forensic data, even roll back changes. That's a huge step up from AV, which can only quarantine or delete files that match a known signature. The key difference: AV looks for known bad; EDR looks for suspicious behavior. That's why CISA recommends running both—let EDR handle the sophisticated stuff while AV filters out the noise.

So, is EDR enough to stop ransomware? No. No single tool is. Ransomware encrypts your files and demands payment. CISA's StopRansomware guidance is blunt: your best bet for recovery is maintaining offline, encrypted backups and testing them regularly. EDR can help detect and stop ransomware in progress, but if an attacker has already slipped in and encrypted your files, you need backups to get out. And don't forget patching—CISA stresses regularly patching and updating software, especially on internet-facing devices. EDR won't patch your systems for you. So, no, EDR alone isn't a silver bullet.

What about Zero Trust? Does that replace EDR? Another myth. Zero Trust is a framework—'never trust, always verify'—that's proactive and preventive. EDR is reactive and detective. They're complements, not substitutes. NIST SP 800-207 defines Zero Trust as minimizing uncertainty in enforcing accurate, least-privilege access per request, viewing the network as compromised. That's about access control, not endpoint detection. You still need EDR to catch the attacker who gets past your Zero Trust controls. As Cisco puts it, EDR and Zero Trust complement each other. Don't let anyone tell you one replaces the other.

But aren't most attacks malware-free now? So AV is useless, right? Here's where the numbers get scary. The CrowdStrike 2026 Global Threat Report found that 82% of detections in 2025 were malware-free—meaning attackers are increasingly using scripts, stolen credentials, and living off the land. And their average breakout time—the time from initial access to lateral movement—dropped to just 29 minutes in 2025. That's a tiny window. But that doesn't make AV useless. It means AV catches the 18% that is malware, while EDR catches the rest. If you ditch AV, you'll get overwhelmed by commodity malware noise. Run both. And don't forget that attackers are using AI now—CrowdStrike 2026 reports an 89% increase in attacks by AI-enabled adversaries. That's a whole new ballgame.

So how do you prioritize when time is short? You can't do everything, so focus on what matters. First, patch known exploited vulnerabilities. CISA's Known Exploited Vulnerabilities (KEV) catalog lists about 1,670 vulnerabilities that are actively exploited in the wild (as of August 2026). Use that as your priority list. Second, implement multi-factor authentication everywhere you can—Verizon's 2026 DBIR recommends it. Third, train employees to spot phishing, especially on mobile devices, which Verizon highlights as a growing target. Fourth, have an incident response plan. And yes, run AV plus EDR. A quick tip: if you're on a budget, start with EDR on your most critical endpoints and AV everywhere else. But don't skip either.

Warning: If your EDR alerts are going off but you don't have a response plan, you're just collecting alarms. Have a playbook ready.

The single most important thing to remember: you don't have to choose—run antivirus and EDR together, patch aggressively, back up offline, and assume you're already breached.

Sources

• CISA - https://www.cisa.gov/stopransomware
• CrowdStrike 2026 Global Threat Report - https://www.crowdstrike.com/en-us/global-threat-report/
• NIST SP 800-207 - https://doi.org/10.6028/NIST.SP.800-207
• Verizon 2026 Data Breach Investigations Report - https://www.verizon.com/business/resources/reports/dbir/
• CISA Known Exploited Vulnerabilities Catalog - https://www.cisa.gov/known-exploited-vulnerabilities-catalog