How to Choose Antivirus Software for Your Business

Antivirus software remains one of the most fundamental — and most misunderstood — components of business cyber security. In an era of sophisticated ransomware campaigns, advanced persistent threats, and AI-powered attack tools, some commentators have declared traditional antivirus dead. The reality is more nuanced. Antivirus has evolved dramatically, and modern endpoint protection platforms bear little resemblance to the signature-based scanners of a decade ago. Choosing the right solution for your business is more important than ever.

For UK businesses, the selection of antivirus software carries compliance implications beyond mere technical protection. Cyber Essentials — the UK government-backed certification scheme that is increasingly required for public sector contracts — mandates that malware protection must be installed and kept up to date on all devices. The NCSC explicitly recommends using reputable antivirus software as part of its small business guidance. And under GDPR, the ICO expects organisations to implement appropriate technical measures to protect personal data, of which endpoint protection is a fundamental component.

This guide helps UK businesses navigate the endpoint security market, understand the differences between product categories, and select a solution that provides genuine protection without unnecessary complexity or cost.

The stakes for getting this decision right have never been higher. The UK's National Cyber Security Centre (NCSC) reported a significant uptick in ransomware incidents targeting small and medium-sized enterprises throughout 2024, with attackers increasingly exploiting gaps in endpoint protection to gain initial footholds within corporate networks. Supply chain attacks, in which threat actors compromise a single vendor to gain access to dozens or hundreds of downstream organisations, have become a mainstream tactic. And the commoditisation of attack tools — including ransomware-as-a-service platforms available on the dark web for as little as a few hundred pounds — means that even relatively unsophisticated criminals can launch damaging campaigns against businesses of any size.

For decision-makers evaluating endpoint protection, the sheer volume of products, marketing claims, and industry jargon can be paralysing. Vendors frequently overstate their capabilities, independent testing methodologies vary, and the difference between product categories is often poorly explained. Making matters worse, many comparison sites are paid placement vehicles rather than genuine reviews. This guide aims to cut through the noise and provide a practical, UK-focused framework for selection.

Antivirus vs EDR vs XDR: Understanding the Categories

The endpoint security market has fragmented into multiple product categories, each offering different levels of protection, complexity, and cost. Understanding these categories is essential for making an informed choice.

It is worth noting that the boundaries between these categories are increasingly blurred. Many vendors that began as traditional antivirus providers have added behavioural detection and response capabilities to their products, whilst specialist EDR vendors have incorporated signature-based detection as a complementary layer. The result is a market in which product names and marketing labels can be misleading. A product marketed as next-generation antivirus may offer EDR-equivalent capabilities, whilst a product labelled as EDR may lack some of the features that distinguish genuine endpoint detection and response from enhanced antivirus. The descriptions below represent the core characteristics of each category, but always evaluate the specific features of any product you are considering rather than relying on its category label alone.

Traditional Antivirus (AV)

Traditional antivirus uses signature-based detection — comparing files against a database of known malware signatures — to identify and block threats. When a file matches a known signature, it is quarantined or deleted. This approach is effective against known threats but struggles with zero-day malware, fileless attacks, and sophisticated threats that evade signature detection. Windows Defender, included free with Windows 10 and 11, falls into this category and has improved significantly in recent years.

Endpoint Detection and Response (EDR)

EDR solutions go beyond signature matching to monitor endpoint behaviour continuously. Rather than simply checking files against a list of known bad signatures, EDR watches for suspicious behaviours — unusual process creation, unexpected network connections, attempts to modify system files, lateral movement across the network. When suspicious behaviour is detected, EDR can alert security teams, isolate the affected endpoint, and provide detailed forensic data for investigation.

Extended Detection and Response (XDR)

XDR extends the EDR concept across the entire technology stack — not just endpoints but also email, cloud services, network traffic, and identity systems. By correlating signals across multiple security layers, XDR can detect complex attacks that no single tool would catch in isolation. For most UK SMEs, XDR represents more capability — and cost — than they need, but for larger organisations or those in regulated industries, it provides the most comprehensive protection available.

Choosing the right category for your business depends on several factors: the sensitivity of the data you handle, the regulatory environment in which you operate, the size and complexity of your IT estate, and the resources available to manage and respond to security alerts. A professional services firm handling sensitive client data, a healthcare provider processing patient records, or a financial services business managing client assets will likely need EDR as a minimum. A small retail business with a handful of workstations and limited exposure to sensitive data may find that a well-configured business antivirus solution provides adequate protection at a lower cost — though even here, the price gap between business antivirus and entry-level EDR has narrowed to the point where EDR is often the better value proposition.

It is also important to consider who will be monitoring and responding to the alerts these systems generate. An EDR solution that generates detailed alerts is only valuable if someone is reviewing those alerts and taking action. For businesses without dedicated IT security staff — which describes the vast majority of UK SMEs — this typically means engaging a managed security service provider or ensuring that your IT support partner includes endpoint monitoring as part of their service agreement.

Key Features to Evaluate

Centralised Management

Any business antivirus solution must offer centralised management — a single console from which you or your IT provider can deploy the software, configure policies, monitor status, and respond to alerts across all your endpoints. Managing antivirus device-by-device is impractical for any business with more than a handful of computers, and it inevitably leads to gaps in coverage. Cloud-based management consoles are preferable for UK businesses with remote or hybrid workers, as they allow management of endpoints regardless of their physical location.

Performance Impact

Security software that slows workstations to a crawl is counterproductive. Modern endpoint protection should operate with minimal impact on system performance — background scanning should be imperceptible during normal work, and real-time protection should not introduce noticeable delays when opening files or applications. This is an area where independent testing laboratories such as AV-TEST and AV-Comparatives provide invaluable data. Both organisations conduct regular performance impact assessments and publish results that allow direct comparison between products.

Ransomware Protection

Given that ransomware is the single most destructive threat facing UK businesses, specific ransomware protection capabilities should weigh heavily in your evaluation. Look for solutions that detect ransomware behaviour (mass file encryption, shadow copy deletion) rather than relying solely on signatures, offer automatic rollback that restores encrypted files from local snapshots, and provide isolation capabilities that disconnect a compromised device from the network within seconds to prevent lateral spread.

Web Filtering and URL Reputation

Many endpoint protection solutions now include web filtering capabilities that block access to known malicious websites, phishing pages, and command-and-control servers. This is particularly valuable because a significant proportion of malware infections begin with a user visiting a compromised or malicious website. URL reputation checking — where the endpoint protection agent evaluates every web address against a continuously updated database of known threats — can prevent infections before any malicious payload is downloaded. For businesses that do not have a separate web filtering solution in place, this feature adds a valuable additional layer of protection at no extra cost.

Email Integration and Attachment Scanning

Given that email remains the primary delivery mechanism for malware, the ability of your endpoint protection to integrate with your email platform is an important consideration. Some EDR solutions offer specific integrations with Microsoft 365 and Google Workspace that provide enhanced scanning of email attachments and links before they reach user inboxes. This goes beyond the built-in scanning provided by the email platform itself, applying the endpoint protection vendor's proprietary threat intelligence and behavioural analysis to email-borne threats. If your business receives a high volume of external email — particularly with attachments — this capability can significantly reduce your exposure to phishing and malware delivery.

Feature	Basic AV	Business AV	EDR
Signature-based detection	Yes	Yes	Yes
Behavioural analysis	Limited	Moderate	Advanced
Centralised management	No	Yes	Yes
Ransomware rollback	No	Some products	Yes
Automated isolation	No	No	Yes
Forensic investigation	No	Limited	Detailed
Cyber Essentials compliance	Meets basic	Meets standard	Exceeds requirements
Typical monthly cost per device	£0-£2	£2-£4	£3-£8

Leading Solutions for UK Businesses

The UK endpoint security market offers strong options across all categories. For businesses seeking EDR-level protection, SentinelOne and CrowdStrike Falcon are consistently top-rated by analysts and testing organisations. Both offer AI-powered detection, automated response, and ransomware rollback capabilities. Microsoft Defender for Business, included with Microsoft 365 Business Premium, provides a compelling EDR option for businesses already invested in the Microsoft ecosystem — it offers strong protection at no additional licence cost for Premium subscribers.

For businesses on tighter budgets or those needing only baseline antivirus, Bitdefender GravityZone, ESET Protect, and Sophos Intercept X offer excellent protection-to-cost ratios with centralised management and strong independent test results. Windows Defender, while improved, is best suited as a baseline layer supplemented by additional security controls rather than a standalone solution for businesses handling sensitive data.

When evaluating specific products, consider conducting a structured proof-of-concept trial rather than relying solely on vendor demonstrations and marketing materials. Most business endpoint protection vendors offer 30-day free trials that allow you to deploy the product on a subset of your endpoints and evaluate its detection capabilities, management interface, performance impact, and alerting quality in your actual working environment. During the trial, pay close attention to the false positive rate — security software that generates excessive false alarms quickly erodes trust and leads to alert fatigue, where genuine threats are overlooked because staff have become desensitised to constant notifications.

Independent testing laboratories provide another valuable resource when comparing products. AV-TEST, based in Germany, publishes bi-monthly evaluations of endpoint protection products across three categories: protection, performance, and usability. AV-Comparatives, based in Austria, conducts annual real-world protection tests, malware protection tests, and performance tests. SE Labs, based in the United Kingdom, performs quarterly endpoint protection assessments that include targeted attack scenarios. Consulting the results from all three laboratories gives a more balanced picture than relying on any single test, as each uses different methodologies and threat sample sets.

Deployment and Management Considerations

Selecting the right product is only half the battle. How you deploy and manage it determines whether the software actually protects your business or simply creates a false sense of security. Common deployment pitfalls include installing the software but never configuring policies beyond the defaults, failing to include all devices — particularly laptops used remotely, which are often the most vulnerable, not monitoring the management console for alerts and incidents, and allowing users to disable or override the protection.

For UK SMEs without dedicated IT security staff, managed endpoint protection — where your IT provider deploys, configures, monitors, and responds to alerts on your behalf — provides the most reliable model. Your provider's security operations team monitors your endpoints alongside those of their other clients, providing economies of scale and 24/7 vigilance that individual businesses cannot achieve on their own.

Remote and hybrid working has introduced additional complexity into endpoint protection deployment. Devices that spend significant time outside the corporate network — connecting via home broadband, public Wi-Fi, and mobile hotspots — face elevated risk and require particular attention. Ensure that your chosen endpoint protection solution can update its definitions and communicate with the management console regardless of the device's network location. Cloud-managed solutions handle this inherently, but some older or on-premises management platforms may struggle with devices that are rarely connected to the corporate network.

Bring-your-own-device (BYOD) policies present a further challenge. If employees use personal devices to access business email and files, those devices represent a potential entry point for threats. Ideally, BYOD devices should be subject to the same endpoint protection requirements as corporate-owned hardware. Where this is not practical — for example, where employees are reluctant to install corporate security software on their personal devices — consider using mobile device management (MDM) solutions that can enforce security policies and provide a degree of separation between corporate data and personal data on the device. The key principle is that any device accessing corporate resources must meet a minimum security baseline.

Regular auditing of your endpoint protection deployment is essential to maintaining its effectiveness over time. At least quarterly, review your management console to verify that all endpoints are reporting in, that definitions and software versions are current, that no devices have been excluded from protection or have outdated policies applied, and that any alerts generated during the period have been reviewed and resolved. Many businesses deploy endpoint protection with good intentions but allow coverage to degrade as new devices are added without the software, employees reinstall operating systems without restoring protection, or departing staff's devices are not properly decommissioned from the management platform.

The Total Cost of Endpoint Protection

When budgeting for antivirus and endpoint protection, look beyond the per-device licence cost. The total cost includes the licence fee per device per month or year, deployment and initial configuration time, ongoing management and monitoring resource, incident response and investigation time when alerts trigger, and training for staff who interact with the management console. For a UK business with 50 endpoints, a well-managed EDR solution typically costs between £1,800 and £4,800 per year in licence fees alone. Managed endpoint protection from an IT provider — which includes deployment, monitoring, and response — typically adds £2 to £5 per device per month on top of the licence cost.

Whilst these figures represent a meaningful investment for a small business, they should be weighed against the cost of a security incident. The UK government's Cyber Security Breaches Survey consistently finds that the average cost of a cyber breach for small businesses runs into thousands of pounds — and this figure accounts only for direct costs such as lost productivity, professional fees, and remediation. It does not capture the reputational damage, lost business opportunities, and management distraction that inevitably follow a significant security incident. For businesses that handle personal data, the potential for ICO enforcement action and GDPR fines adds further financial exposure that can dwarf the cost of prevention.

There is also a competitive dimension to consider. An increasing number of enterprise clients and public sector organisations require their suppliers to demonstrate Cyber Essentials certification — which mandates endpoint protection — as a condition of doing business. Tenders for government contracts worth more than £5 million that involve handling certain sensitive information require Cyber Essentials certification as a prerequisite. For growing businesses that aspire to work with larger clients or public sector bodies, investing in robust endpoint protection is not merely a cost centre but a business enabler that opens doors to revenue opportunities that would otherwise remain firmly closed.

Choosing antivirus software for your business is not about finding the product with the highest detection rate in a laboratory test — although test results are a useful data point. It is about selecting a solution that provides the right level of protection for your risk profile, integrates with your existing technology stack, can be managed effectively with the resources available to you, and meets your compliance obligations. For most UK businesses in 2025, that means an EDR solution, centrally managed, with professional monitoring and response — either in-house or through a managed security service.