EDR vs Antivirus: Which Protection Should a Modern Company Choose?
Antivirus is signature-based; EDR performs behavioral analysis. AV is bypassed by polymorphic malware, fileless attacks, Living off the Land and MFA bypass. EDR offers ATT&CK mapping plus automated response. By 2026, EDR/XDR is fundamental even for SMEs. Defender, CrowdStrike and SentinelOne are the market leaders. KAOS, a local AI, sits on a different layer.
EDR vs Antivirus: Which Protection Should a Modern Company Choose?
TL;DR: Classic antivirus works on a signature basis, matching the hash of known malware and quarantining it. EDR (Endpoint Detection and Response) performs behavioral analysis; it catches fileless attacks, polymorphic malware and Living off the Land techniques through telemetry. As of 2026, antivirus alone is no longer enough even at SME scale, and EDR or XDR is accepted as a fundamental requirement. Microsoft Defender for Endpoint, CrowdStrike Falcon, SentinelOne and Cybereason are among the market leaders. KAOS, a local AI engine, offers a different alternative that unifies pentest and defense workflows.
This article supports the endpoint-defense section of the Turkey Cyber Threat Landscape 2026 pillar content. In practical terms, it explains the technical difference between antivirus and EDR, which company size should choose which product, the hardening steps, and the KVKK dimension.
What Does Antivirus Do?
Traditional antivirus works through three main mechanisms. The first is signature-based scanning: it keeps the hash or byte patterns of known malware in a database and compares scanned files against these patterns. The second is heuristic analysis: it catches suspicious behavior (for example, a macro-containing Office document calling PowerShell) with simple rules. The third is real-time scanning: it kicks in instantly when a file is opened, downloaded or executed.
Antivirus, a technology of 30 years ago, is still valuable. For known threats it is cheap and effective. But the modern attacker has learned to operate in the places antivirus does not look.
Why Do Modern Attacks Bypass AV?
Polymorphic Malware
The same malware produces a different hash on each distribution. Its internal encryption routine uses a separate key in every instance. The signature database does not recognize this variant, and the file appears clean.
Fileless Attack
The attacker writes nothing to disk. A PowerShell command runs directly in memory, WMI triggers take the event, and code is hidden in the registry. Antivirus waits for a file, the file never comes, and no alarm sounds.
Living off the Land (LotL)
The attacker uses signed, "good" binaries already present on the system. Tools such as PowerShell, certutil, mshta, rundll32, bitsadmin and regsvr32 ship with Windows, and antivirus does not block them. Under MITRE ATT&CK, technique T1218 "Signed Binary Proxy Execution" is in this category. For details, MITRE ATT&CK should be referenced.
LSASS Dumping
mimikatz and similar tools exfiltrate password hashes and Kerberos tickets from the Windows LSASS process. A significant portion of antivirus products catch the file signature but do not directly block the behavior of dumping from memory; this can only be detected through behavioral telemetry.
MFA Bypass and Token Theft
Theft of the OAuth session cookie, adversary-in-the-middle kits and device-registration tricks fall outside antivirus's scope. They happen on the identity plane, not the file plane.
What Does EDR Do?
EDR continuously collects telemetry on the endpoint. Process trees, file/registry/network calls, command-line arguments, module loading and privilege-escalation attempts are gathered centrally. This telemetry is mapped to the MITRE ATT&CK matrix; when a TTP chain is triggered, an automated response begins: kill the process, delete the file, isolate the host from the network, terminate the user session, take a forensic snapshot for evidence.
The U.S. CISA officially recommends this kind of telemetry-centric approach to endpoint defense. The CISA Defender for Endpoint Best Practices document details the configuration checklist.
EDR vs XDR vs MDR
The three acronyms are often confused.
EDR focuses only on the endpoint: laptop, server, virtual machine.
XDR (Extended Detection and Response) combines, in a single correlation engine, network, email, identity (Azure AD/Entra ID), cloud workload, OT/IoT and SaaS telemetry in addition to the endpoint. A user logging in from outside Turkey, then setting an inbox rule in email, then running PowerShell on their laptop, is processed not as three separate signals but as a single event.
MDR (Managed Detection and Response) is not a technology but a service model: a 24/7 human SOC operation, an external team that triages alarms and responds on the client's behalf.
The MITRE ATT&CK Framework
ATT&CK is a living catalog of 14 tactics and more than 200 techniques compiled from real attacks. Attack steps are classified under the headings Reconnaissance, Initial Access, Execution, Persistence, Privilege Escalation, Defense Evasion, Credential Access, Discovery, Lateral Movement, Collection, Command and Control, Exfiltration, Impact and Resource Development.
EDR products are compared in terms of detection coverage for each TTP. MITRE Engenuity ATT&CK Evaluations publishes independent test results; in a purchasing decision you should look at these results rather than a marketing brochure.
Which Is for Which Company?
Very Small Business (Under 10 People)
You can start with Microsoft Defender Antivirus on Windows 11 Pro plus Microsoft 365 Business Basic. Even without full EDR, keeping SmartScreen, Controlled Folder Access and cloud-delivered protection on lays the basic groundwork. A move to Business Premium should be planned within 1-2 years.
SME (10-100 People)
Microsoft 365 Business Premium includes Defender for Endpoint Plan 1 in the license and is the most economical EDR entry in terms of cost. Details can be followed from the Microsoft Defender for Endpoint documentation. Alternatively, the CrowdStrike Falcon Go SKU or SentinelOne Singularity Control also address this scale. EDR is no longer optional but fundamental in this segment.
Mid-Size (100-500 People)
Defender for Endpoint Plan 2 (including automated investigation, threat and vulnerability management, and advanced hunting), CrowdStrike Falcon Pro or SentinelOne Complete are the typical choices. At this level an internal security team is not enough, and it is taken together with an MDR service.
Large Scale (500+ People)
An XDR platform becomes a necessity: Microsoft Defender XDR, CrowdStrike Falcon Insight XDR, Palo Alto Cortex XDR. SIEM (Sentinel, Splunk, QRadar) integration, a 24/7 SOC, a case-management system and an incident-response retainer complete the picture.
Market Leaders
The Gartner Magic Quadrant methodology places providers in the Endpoint Protection Platforms category into four regions on the axes of "completeness of vision" and "ability to execute." In recent years, the players consistently appearing in the Leaders region have been Microsoft, CrowdStrike, SentinelOne, Palo Alto Networks and Trend Micro. Specific positions change from year to year; for a purchasing decision you should look at the version of the current report you can access and not rely on old commentary.
Every product has strengths and weaknesses: Microsoft's integration and price advantage, CrowdStrike's mature hunting, SentinelOne's agent performance, Palo Alto's network integration, Trend Micro's experience in the Asian market. There is no single right answer; the choice is made according to your inventory and operational capacity.
Local EDR Options
Some local products are coming to the fore in the Turkish market. Defense-class endpoint solutions developed within ASELSAN, Logsign's package integrated with its SIEM/SOAR ecosystem, ULAK and other public-focused players can be cited as examples. This segment is especially meaningful for the public sector, defense and critical infrastructure.
KAOS stands in a different category on this list. Beyond a classic EDR agent, it unifies pentest and defense workflows in a single agentic AI engine; it scans the attack surface itself, automatically verifies the vulnerabilities it finds, and then correlates with EDR/XDR telemetry on the defense side. It is designed to work not in place of EDR but on top of EDR.
EDR Hardening Steps
Buying a license is not enough to run the product. The hardening list:
- Tamper Protection on, so the attacker cannot turn off the agent.
- Cloud-delivered protection on, so new threat intelligence arrives in real time.
- Network protection on, so known malicious IPs/domains are blocked.
- ASR (Attack Surface Reduction) rules in Block mode, so common vectors such as Office macro abuse, child-process creation and USB execution are closed.
- Controlled Folder Access on, to block ransomware encryption attempts.
- Web filtering enabled, to cut phishing URLs before they reach the browser.
- A dated plan to move from Audit mode to Block mode, so you do not fall into the "let's keep it in audit for now" trap.
The Role of EDR in Ransomware Protection
Ransomware does not happen all at once; it is the end of a chain lasting hours, even days. EDR catches this chain early: abnormal lateral movement (SMB scanning, RDP brute force), credential dumping (LSASS access), volume shadow copy deletion (vssadmin delete shadows), bulk file-write behavior. When one of these signals is triggered, the host is isolated and the incident closes before the encryption stage.
Still, the capsule does not always hold. If encryption has begun, the process becomes not technical but emergency response. The article Ransomware: The First 24 Hours lists the operational steps; the moment the EDR alarm arrives, you must move to this procedure.
Where EDR Falls Short
EDR does not solve everything. There are four important limits.
First, in genuinely new 0-day attacks the behavioral signature may not yet have formed. Second, the deliberate malicious action of an authorized user (insider threat) often looks normal. Third, incidents on the cloud-service side (a misconfigured S3 bucket, an exposed API key) do not touch the endpoint; CSPM and CWPP tools are needed. Fourth, in identity-based attacks (token replay, OAuth phishing) IAM, conditional access and ITDR solutions must come into play.
The EDR + MFA + Backup Trio
The simultaneous operation of these three controls forms the minimum security baseline of an SME. EDR sees behavior on the endpoint, MFA makes token games harder on the identity plane, and an immutable backup guarantees business continuity in the worst case. Leave one out and the value of the others falls; the attacker enters through the weak link.
Cost
EDR pricing is generally a per-endpoint monthly subscription model. The plan varies according to which modules (vulnerability management, threat intelligence, MDR service) are included in the license. It is clearly more expensive than consumer antivirus. At SME scale the budget is manageable; in the enterprise tier it reaches annual six-figure numbers. For official price lists you should speak directly with the provider's sales team or the authorized Turkey distributor; deriving prices from secondhand commentary is misleading.
KVKK and Privacy
EDR telemetry can contain personal data: usernames, the application run, the URL visited, the file paths opened, and at times even file content. By KVKK Article 4 (the principle of honesty) and Article 5 (purpose limitation), this processing must be announced clearly and intelligibly.
What should be done in practice: add an "endpoint security telemetry" line to the disclosure text, update the employee consent process, and check the currency of the data inventory and VERBIS registration. If a foreign cloud-based EDR is used, the KVKK's rules on cross-border transfer (Art. 9) must be applied for the data transfer.
FAQ
Defender is free, why do I need a paid EDR?
Windows Defender Antivirus ships free and is a good AV engine. But true EDR capability (telemetry, hunting, automated investigation) is unlocked with a Microsoft 365 E5 or Defender for Endpoint Plan 2 license. The free tier is the AV layer, not EDR.
Can antivirus and EDR be run together?
Modern EDR products already carry an AV engine inside them. Two different AVs on the same machine conflict, the system slows down, and detection enters race conditions. When you move to EDR, remove the old AV.
Does EDR slow the system down?
On mature products the additional overhead is generally not felt. If a performance problem arises, exclusion lists (build server, database files) must be configured correctly; keeping these exceptions broad breaks security, so they should be kept narrow and justified.
Cloud-based EDR or on-prem?
The market's direction is clearly cloud-managed. On-prem is only meaningful for isolated networks (military, critical OT). Cloud management provides instant signature updates, faster deployment and a lower operational burden.
Is there a local EDR option?
Yes. ASELSAN, Logsign and a few players are positioned in the public/critical-infrastructure market. KAOS, by contrast, occupies a different niche as an agentic AI layer that works on top of EDR rather than in its place.
Must I include a staff member's phone in the EDR?
That depends on the BYOD policy. Phones that access company data should be brought into MDM/MTD scope; mobile threat-defense products are more suitable than a full desktop EDR agent.
What should I do when an EDR alarm arrives?
First verify whether the alarm is real (it may be a false positive), then move to a pre-prepared playbook: isolate the host, collect evidence, contact the relevant user, inform senior management, and call an external IR team if needed. Never close the alarm and say "I'll look at it later."
Can I buy EDR and manage it myself?
If it is a 10-person company, yes, to a limited degree. If it is 100+ employees or a regulated sector (finance, healthcare, public), no; an MDR service or an internal SOC team is essential.
Working With DSET
The EDR and XDR selection process is not a product list but an architectural decision. If the decisions of which telemetry is gathered centrally, which automation runs, and how far the MDR service's response authority reaches are not set up correctly, an expensive license turns into a shelved console.
The areas we work on at DSET:
- EDR/XDR selection consultancy (Microsoft, CrowdStrike, SentinelOne, local alternatives)
- A unified pentest plus defense workflow with the KAOS local AI engine
- ASR and hardening configuration audit
- Writing a KVKK-compliant telemetry policy
- 24/7 monitoring and a ransomware incident-response retainer
For context, read the Turkey Cyber Threat Landscape 2026 main content and, for the ransomware scenario, the Ransomware: The First 24 Hours article.
Contact: Hacettepe Teknokent, Ankara · +90 536 662 38 09
Sources: MITRE ATT&CK, Gartner Magic Quadrant methodology, CISA EDR best practices, Microsoft Defender for Endpoint, CrowdStrike Falcon, KVKK
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