Antivirus vs. EDR: understanding the difference in endpoint protection

Antivirus software Detects and removes known malware by matching files, processes, and network traffic against a database of recognized threat signatures. Effective against documented malware variants; limited against novel, fileless, or credential-based attacks.

Endpoint detection and response (EDR) A continuous monitoring and automated response platform that collects behavioral telemetry from every endpoint and uses behavioral analysis, machine learning, and threat intelligence to detect both known and unknown threats in real time. Designed for MSPs and security teams that need investigation, containment, and recovery capabilities — not just prevention.

• Traditional antivirus software detects known threats via signature matching; it cannot identify fileless malware, credential-based attacks, or zero-day exploits without a matching signature.

• EDR solutions provide continuous endpoint monitoring, behavioral analysis, automated response, and forensic investigation capabilities that antivirus software alone cannot deliver.

• According to the CrowdStrike 2025 Global Threat Report (vendor research), 79% of detections in 2024 were malware-free — underscoring the structural limitations of signature-based defenses against modern attack techniques.

• Average adversary breakout time fell to 48 minutes in 2024 (CrowdStrike 2025 Global Threat Report, vendor research), requiring automated detection and response rather than manual escalation workflows.

• Antivirus and EDR are complementary: antivirus blocks known threats at the first layer; EDR detects, investigates, and responds to threats that evade signature-based defenses.

• For MSPs, integrated platforms that combine EDR with backup and recovery — such as Acronis Cyber Protect Cloud — address both the security and business continuity dimensions of endpoint protection in a single agent and console.

Traditional antivirus software and endpoint detection and response (EDR) are both designed to protect endpoints, but they address fundamentally different threat scenarios. For managed service providers and IT security teams assessing their security stack, understanding the distinction between antivirus and EDR — and the case for using both — is critical to building an effective defense against modern threats.

Traditional antivirus software and EDR solutions both protect endpoint devices, but they operate on different principles. Antivirus software relies on signature-based detection to identify and block known malware. EDR solutions use continuous monitoring, behavioral analysis, and automated response to detect and contain both known and unknown threats in real time.

Antivirus software scans files, processes, and network traffic against a database of known malware signatures. When a match is detected, the software blocks, quarantines, or removes the threat. Most antivirus tools run continuously in the background and extend protection through features such as URL filtering and firewall integration.

Antivirus software is reliable against well-documented threat variants with established signatures. Its core limitation is that the signature database must be constantly updated, and any malware that does not match a known signature — including new variants, fileless attacks, and credential-based intrusions — can pass through undetected.

EDR solutions collect and analyze telemetry data continuously from every managed endpoint: process activity, file access events, network connections, registry changes, and more. This telemetry is correlated in real time to identify patterns consistent with known attack techniques or anomalous behavior that may indicate a novel threat.

When a potential incident is identified, the EDR platform generates an alert with full contextual detail, typically mapped to the MITRE ATT&CK framework. Security teams can investigate, contain, and remediate directly from a central console. Many EDR platforms also automate initial response actions — such as isolating an affected endpoint from the network — to limit lateral movement while investigation is underway.

Antivirus software remains a necessary baseline, but it is no longer sufficient as a standalone endpoint defense. The threat landscape has evolved in ways that expose its structural limitations.

According to the CrowdStrike 2025 Global Threat Report (vendor research based on CrowdStrike's global customer telemetry), 79% of detections observed in 2024 were malware-free — meaning adversaries used stolen credentials, legitimate system tools, and hands-on-keyboard techniques rather than deploying traditional malicious files. Signature-based antivirus cannot detect these intrusions because there is no malicious payload to identify.

Attack speed compounds this problem. The same report found that the average adversary breakout time — the interval between initial compromise and lateral movement to a second host — fell to 48 minutes in 2024, with the fastest observed breakout taking just 51 seconds. At this pace, detection and response workflows that rely on manual escalation leave organizations with almost no window to contain an intrusion before it spreads.

Threat categories that routinely evade traditional antivirus include:

•       Fileless malware — executes entirely in memory, leaving no on-disk artifact for signature scanning to detect

•       Zero-day exploits — leverage vulnerabilities for which no signature or patch exists

•       Advanced persistent threats (APTs) — use low-profile, prolonged techniques designed to avoid triggering behavioral thresholds

•       Credential-based attacks — abuse legitimate account access to traverse a network without deploying malware at all

The table below summarizes the key differences between traditional antivirus software and EDR across the dimensions most relevant to MSPs and security decision-makers.

EDR solutions extend endpoint protection across every phase of the threat response cycle — from initial detection through investigation, containment, and recovery.

EDR solutions move beyond reactive signature scanning by establishing a behavioral baseline for each endpoint and flagging deviations from normal activity. This approach enables EDR to detect threats with no known signature — including fileless attacks, living-off-the-land techniques that abuse legitimate administrative tools like PowerShell or WMI, and unauthorized lateral movement via valid credentials. Continuous telemetry collection also means historical endpoint data is available for forensic analysis after an incident.

Where antivirus software acts when a file triggers a known signature, EDR platforms initiate automated response at the point of detection. Capabilities typically include network isolation of affected endpoints to prevent lateral movement, termination of malicious processes, and rollback of unauthorized changes. This automated initial response compresses the window between detection and containment — a critical advantage when adversaries can establish persistence across a network in under an hour.

Modern EDR solutions apply AI and machine learning models to analyze behavioral telemetry at scale. These models adapt continuously based on new threat data, improving detection accuracy and reducing false positive rates that can otherwise create alert fatigue for security teams. AI-guided analysis also accelerates incident investigation by surfacing attack chain context, prioritizing alerts by severity, and generating structured summaries — reducing the time analysts spend on manual log review.

EDR platforms provide security analysts with tools to proactively search for threats that have not triggered automated alerts — a practice known as threat hunting. Most enterprise-grade EDR solutions map detected activity to MITRE ATT&CK tactics, techniques, and procedures (TTPs), giving analysts a structured framework for understanding adversary behavior and communicating findings to technical and non-technical stakeholders alike.

EDR solutions aggregate telemetry from all managed endpoints into a single platform, eliminating the blind spots that emerge when antivirus tools operate independently on individual devices. Centralized visibility enables security teams to identify patterns across multiple endpoints simultaneously — a prerequisite for detecting coordinated attacks such as ransomware campaigns that move laterally before encrypting data.

Antivirus and EDR are complementary, not competing, solutions. Antivirus software provides a reliable first layer of defense — blocking known malware before it can execute. EDR addresses the threats that pass through this layer by providing behavioral detection, investigation, and automated response capabilities that antivirus software is not designed to deliver.

A layered security strategy that combines antivirus and EDR delivers more comprehensive endpoint protection than either solution in isolation. For MSPs managing multiple clients or large endpoint estates, this combination is increasingly a baseline expectation for clients with cyber insurance requirements, regulatory compliance obligations, or exposure to sophisticated threat actors.

Acronis delivers integrated endpoint detection and response as part of Acronis Cyber Protect Cloud — a unified platform that combines EDR, backup, disaster recovery, endpoint management, and anti-malware in a single agent and console, purpose-built for MSPs.

Acronis Security + EDR provides AI-guided attack chain visualization, real-time incident detection, and single-click response actions — including integrated recovery — managed from the same console used for data protection and endpoint management. Investigation workflows are accelerated by AI-generated incident summaries and MITRE ATT&CK mapping, reducing analysis time from hours to minutes without requiring dedicated in-house security expertise.

For MSPs scaling their EDR practice, Acronis EDR is natively integrated within Acronis Cyber Protect Cloud as a modular add-on. This enables service providers to extend endpoint detection and response capabilities to clients without deploying a separate security stack — maintaining a single agent, single console, and single policy framework across protection and security services.

EDR is not replacing antivirus — it is extending it. Antivirus software remains a necessary first layer of defense, providing reliable protection against known malware. EDR addresses the threats that antivirus cannot detect: fileless attacks, credential-based intrusions, zero-day exploits, and advanced persistent threats. A layered approach that combines both remains the recommended standard for MSPs and enterprise security teams.

For most organizations — and particularly for MSPs serving business clients — yes. Antivirus software alone leaves significant gaps against modern attack techniques. EDR alone may not prevent known malware from executing before behavioral signals trigger an alert. Together, antivirus and EDR provide layered protection that covers a broader threat surface, with each solution compensating for the other's limitations.

EDR detects threats based on behavioral patterns rather than known signatures. This includes fileless malware that executes in memory without writing to disk, living-off-the-land attacks that abuse legitimate administrative tools such as PowerShell or WMI, lateral movement via stolen credentials, and zero-day exploits for which no antivirus signature yet exists.

When EDR identifies a potential incident, it can initiate automated response actions — including isolating the affected endpoint from the network, terminating malicious processes, and rolling back unauthorized changes — while simultaneously generating a prioritized alert with contextual detail about the attack chain. This automated initial response limits damage and lateral spread while security analysts investigate and remediate.

EDR focuses specifically on endpoints. Extended detection and response (XDR) expands that coverage to additional attack surfaces — including email, identity, cloud workloads, and collaboration applications — correlating telemetry across all of these sources in a single platform. XDR is the logical evolution of EDR for organizations and MSPs that need cross-domain visibility beyond the endpoint layer. Acronis offers Acronis XDR as an extension of its endpoint security platform for MSPs requiring this broader coverage.