Antivirus vs EDR vs MDR: Which Protection Does Your SME Need?

According to CrowdStrike’s 2025 Global Threat Report, 79% of detections in 2024 were “malware-free” — carried out without a file an antivirus could scan and recognize. The attacker got in using a stolen password, a legitimate admin tool, or a component already present on the system. That single number explains why “I have a good antivirus, I’m safe” no longer holds.

The real question: are antivirus, EDR and MDR just pricier versions of the same thing, or do they do different jobs? Short answer — different jobs. Which one you need depends on how big your company is and on who watches security from the inside.

What antivirus does, and where it stalls

Traditional antivirus (now usually branded NGAV, next-generation antivirus) catches known threats. It is signature-based: it holds the fingerprints of millions of known malicious files, checks each file against that list as it lands on disk, and blocks a match. For a known virus or trojan, it remains a fast and effective first line.

Where it stalls is the no-file scenario. Fileless attacks, credential theft, and living-off-the-land techniques leave no signature to scan. By the time antivirus notices something, the attacker may already have moved laterally across the network. Antivirus asks “is this file bad?” — modern attacks are caught by asking “is this behavior normal?”

What is EDR, and how is it different?

EDR (Endpoint Detection and Response) continuously records what happens on every device and analyzes behavior. Which process launched which process, who connected where on the network, why a user account is encrypting dozens of files back-to-back at midnight — it watches all of it. When it sees a suspicious chain, it raises an alert, can automatically isolate the device from the network, and in some cases roll back the changes ransomware made.

The gist: antivirus is the guard at the door, EDR is the camera system inside the building. The guard won’t let in a criminal he recognizes; the camera records and warns you when something abnormal moves inside. EDR is built to see unknown threats, zero-day exploits, and insider risk.

One critical point: EDR is a tool. Someone has to read, interpret, and act on those alerts. If an alert fires at 3:00 AM and the first person to see it arrives at 9:00, the attacker has six hours to finish the job.

What is MDR, and when do you go beyond EDR?

MDR (Managed Detection and Response) closes exactly that gap. MDR adds a 24/7 human team (a SOC, security operations center) on top of EDR technology. Experts watch the alerts for you, separate a real threat from a false alarm, step in during a serious incident in the middle of the night to isolate the device, and call you.

Think of it this way: EDR installs the camera system. MDR is the security firm that watches those cameras and acts when the alarm sounds. Most SMEs don’t have a team to monitor security alerts around the clock — and realistically won’t. MDR is how you rent enterprise-grade defense without hiring for it.

Antivirus, EDR and MDR side by side

Feature	Antivirus (NGAV)	EDR	MDR
Detection method	Signature, known threats	Behavioral, continuous monitoring	EDR + human analysis
Unknown / fileless threats	Weak	Strong	Strong
Automated response	Limited	Yes (isolation, rollback)	Yes
Who watches the alerts?	—	Your team	24/7 expert SOC
Nights / weekends covered	Passive	If you have a team	Yes
Best for	Basic protection, added layer	Org with in-house IT/security	SME without an in-house team

EDR and MDR are priced per device on a monthly model; international sources discuss ranges starting from a few tens of dollars per endpoint per month. In Türkiye the figure varies by product, user count and service scope — the right move is to get a quote with your user count in hand. The comparison that matters: the average cost of a ransomware attack dwarfs a monthly monitoring service.

As an SME, which should I choose?

Three situations make the call easier:

1. Very small, low-risk setup: A handful of computers, little sensitive data. A strong NGAV + regular backups + patch management is a reasonable start. Just know that your threat visibility stays limited.
2. Organization with an IT team: If you have people to monitor and interpret alerts, EDR is the right layer. You buy the technology and run the operation yourself.
3. SME with no in-house security team, sensitive to data loss and downtime: Accounting firms, law offices, e-commerce, manufacturing, healthcare. MDR makes the most sense here. You buy 24/7 monitoring from outside for far less than the cost of a single specialist hire.

Ransomware cases in Türkiye have risen sharply in recent years, and attackers now operate as professional “Ransomware-as-a-Service” (RaaS) outfits that rent attacks even to people with limited technical skill. The target isn’t only large companies; small and mid-sized businesses get picked precisely because their defenses are weaker.

Frequently asked questions

If I get EDR, do I still need antivirus? Most modern EDR products include the NGAV layer, so you don’t need to install a separate antivirus. Signature-based blocking and behavioral detection come together in one product.

Is the only difference between MDR and EDR the human element? Largely yes — but it’s not a small difference. The 24/7 SOC team in MDR means threat hunting, alert prioritization, and response the moment something happens. Buying the technology without the human operation is like installing a camera no one watches.

Where does Microsoft Defender fit in? The Defender family spans the layers from NGAV to EDR and, with the right license, offers a strong foundation. Even so, without a team or an MDR service to monitor and respond to alerts, buying the product alone is half of the protection.

If you want to discuss which layer fits your business and review your current antivirus and backup setup, get in touch — we’ll give you a clear recommendation based on your user count and industry.

Sources

• CrowdStrike — 2025 Global Threat Report (malware-free detection rate)
• Palo Alto Networks — What is EDR vs. Antivirus?
• Acronis — Antivirus vs. EDR: endpoint protection