Your small business has antivirus software on every computer, and you think you're protected. That's what most business owners in Trois-Rivières and the Mauricie region believe too, until the day an employee clicks on the wrong attachment and the entire network is encrypted by ransomware. The antivirus was up to date. It didn't see it coming.

The problem isn't your software; it's the type of tool. Modern attacks no longer resemble a classic virus that an antivirus program can recognize. This is precisely where EDR comes in. Here, in no unnecessary jargon, is the real difference between an antivirus and an EDR, and how to decide what you need to protect your company's workstations.

1. Traditional antivirus software: what it does, and no longer does

Antivirus software works with a simple logic: it compares the files on your computer to a database of known threat signatures. If a file matches a virus already listed, it blocks it. This approach worked very well for 20 years, when threats were identifiable files that spread slowly.

The problem is that attackers have changed their methods. Today, a large proportion of attacks don't use any detectable malicious files. They rely on tools already present in Windows (PowerShell, legitimate scripts), stolen credentials, or malware that is modified thousands of times a day to evade signatures. Antivirus software, meanwhile, is always waiting to recognize something it already knows.

What the antivirus still does well:

• Block known and listed viruses and malware
• Protecting against unsophisticated mass threats
• To serve as a first layer of automatic and resource-efficient defense

What it doesn't do: detect a new attack, understand abnormal behavior, or tell you what actually happened after an intrusion. For that, you need a different type of tool.

2. EDR: Monitor behavior, not just files

EDR stands for Endpoint Detection and Response. Instead of searching for known viruses, EDR observes what workstations are doing in real time: which programs are launched, which network connections are opened, which files are modified in bulk, which account is trying to access what.

When unusual behavior occurs, such as a process encrypting hundreds of files at once or an account logging in at 3 a.m. from abroad, the EDR raises an alert, documents the entire chain of events, and can automatically isolate the affected machine from the rest of the network. This last point is crucial for SMEs: it stops the spread of the virus before it reaches the file server or backups.

The other strength of EDR is traceability. After an incident, you know exactly where the attacker entered, what they touched, and how long they stayed. With a simple antivirus, this information simply doesn't exist, which greatly complicates the incident reporting required by Quebec's Bill 25.

3. Antivirus or EDR: the real differences

To help you decide between the two, here's what changes in concrete terms on a daily basis:

• Detection method: the antivirus recognizes known threats, the EDR analyzes suspicious behavior, even unprecedented behavior.
• Timing of action: the antivirus blocks at the entry, the EDR monitors continuously and reacts even after the intrusion.
• Answer: the antivirus deletes a file, the EDR isolates a machine, stops a process and reconstructs the entire attack.
• Visibility: the antivirus gives an alert, the EDR provides a complete investigation that can be used for compliance.
• Target: Antivirus targets mass threats, EDR targets targeted attacks and modern ransomware.

The good news is that it's not really an "either/or" choice. Most modern EDR solutions already integrate a next-generation antivirus engine. Choosing EDR means keeping the best of antivirus protection and adding the missing layer. If you want to get a clear picture of your current level of protection, an audit of your IT services is the logical starting point.

4. Why are SMEs in Trois-Rivières and the Mauricie region being targeted?

Many executives still believe that cyberattacks only target large Montreal companies or multinationals. The reality on the ground is the opposite. Regional SMEs have become prime targets precisely because they are perceived as less protected, while also possessing sensitive data and the ability to pay a ransom.

The Canadian Centre for Cyber ​​Security also points out that ransomware is among the most likely and damaging threats to Canadian organizations. For a small or medium-sized manufacturing or service company in the Mauricie region that loses access to its files for a week, this represents a direct production crisis.

In addition, there is Bill 25 on the protection of personal information, which requires Quebec to report any serious data breaches. Without a Data Disclosure Statement (DDS), proving what was affected or not during a leak becomes nearly impossible, weakening your legal position and your insurance coverage.

5. Managed EDR: the realistic option for an SME

An EDR generates a lot of alerts, and that's normal: it sees everything. But an alert that no one analyzes in time is worthless. Most SMEs don't have a security analyst available 24/7 to triage these signals. That's where managed EDR, also called MDR (Managed Detection and Response), comes in.

In practical terms, your IT partner deploys the EDR, continuously monitors alerts, distinguishes between genuine incidents and false positives, and intervenes on your behalf when a threat is confirmed. You maintain protection without having to build an in-house security team.

• Continuous monitoring of workstations and servers, day and night
• Human triage of alerts to avoid fatigue and blind spots
• Rapid response: isolation of the workstation, blocking of the attack, cleanup
• Clear reports for management and for your obligations under Law 25

For a small or medium-sized enterprise (SME) in the region, this model is often the most sensible: the technology of a large company, operated by an external team that knows your environment.

6. How to choose and deploy without making a mistake

Before replacing or supplementing your antivirus software, take the time to define the scope of the project. Here's a simple approach:

• Take inventory: how many workstations, servers, mobile devices, and which systems (Windows, Mac, Microsoft 365) need to be protected.
• Identify your sensitive data: customer files, financial data, personal information covered by Law 25.
• Check compatibility: a good EDR integrates with Microsoft 365 and Microsoft Defender to also cover email and identity.
• Choose the managed mode: unless you have a dedicated security team, opt for an EDR monitored by your IT provider.
• Plan the deployment: gradual installation, testing, and rapid employee training on best practices.

The goal isn't to pile on software, but to have consistent, monitored protection aligned with your actual risks. A local partner can work with you to define this framework in just a few meetings.

Frequently Asked Questions

Does EDR completely replace antivirus software?

In practice, yes. Modern EDR solutions include a next-generation antivirus engine. Therefore, you don't need to maintain a separate antivirus program: EDR covers both functions and adds behavioral monitoring.

Does a small company with 10 employees really need an EDR?

Yes. Size is no longer a criterion for attackers, who target the least protected organizations. A 10-person SME with customer data has just as much interest in protecting itself as a larger one, especially with the requirements of Bill 25 in Quebec.

Can you install an EDR yourself?

Technically, installation is possible, but effectiveness depends on continuous alert monitoring. Without someone to analyze and respond, the tool loses most of its value. This is why an EDR managed by an IT partner is recommended for most SMEs.

Protect your workstations with an IT partner from the Mauricie region

Transitioning from antivirus to EDR doesn't have to be complicated. At OKTO Solutions, we help SMEs in Trois-Rivières, the Mauricie region, and elsewhere in Quebec assess their actual level of protection, deploy a managed EDR, and remain compliant with Bill 25. Discover our managed IT services or contact us directly through our contact page for an initial, no-obligation consultation.