Why Canadian Construction Companies Are Ransomware Targets

Hard hats, tight deadlines, and zero time for IT,  here's why hackers love your industry

It's 7:14am on a Wednesday in Montreal. Your site super is already on the phone with a subcontractor. Your project manager is juggling three RFIs. The office admin just opened what looks like an invoice from a familiar supplier — wrong logo, slightly different email address, but close enough at 7am before the first coffee. She clicks the attached PDF.

By 9am, files on your server are encrypting. By noon, your project management software is locked. By end of day, you're staring at a ransom demand for $180,000 CAD — and a project deadline you can't miss.

This isn't hypothetical. It's a pattern playing out across Canadian construction firms in Montreal, Toronto, and every city in between. The construction industry is now ranked among the top three most attacked sectors globally in 2025, and Canada is the second most targeted country after the United States.[1] If you're in construction and you haven't been hit yet, the question isn't whether you're a target. It's whether you're prepared.

What is the most targeted industry for ransomware attacks?

Manufacturing holds the top spot globally, accounting for nearly 20% of all recorded ransomware incidents in 2025 — but construction isn't far behind, with 443 recorded attacks in 2025 alone, a 24% increase year over year.[2] In Canada specifically, ransomware incidents across all industries grew at an average of 26% year over year from 2021 to 2024, according to the Canadian Centre for Cyber Security.[3]

What makes construction such a desirable target? It comes down to a combination of factors that make the industry uniquely vulnerable — and uniquely profitable for attackers.

Construction projects run on tight deadlines with significant financial penalties for delays. A ransomware attack that takes your systems offline for even 48 hours doesn't just cause an IT headache — it triggers real contractual consequences. Attackers know this. They know that a construction firm mid-project is far more likely to pay a ransom quickly than a company that can afford to wait out a recovery.

Add to that the reality that between 2023 and 2024, phishing attacks on Canadian construction companies increased by 83% and ransomware attacks grew by 41%, according to Northbridge Insurance.[4] That's not a sector-wide anomaly. That's a deliberate targeting pattern.

How do hackers pick their targets?

Hackers are, at their core, rational economic actors. They go where the return on investment is highest — which means they look for industries that have three things: valuable data, weak defenses, and high pressure to pay.

Construction ticks all three boxes.

Valuable data — Construction firms hold blueprints, BIM files, contracts, bid documents, subcontractor agreements, client financial records, and sometimes government or infrastructure project data. That's a goldmine for theft, extortion, or competitive espionage.

Weak defenses — The construction industry consistently underinvests in cybersecurity compared to other sectors. Firms often operate with legacy software, unpatched systems, and shared devices across multiple job sites — environments that are notoriously difficult to secure. IT security often gets treated as overhead rather than infrastructure.

High pressure to pay — With project timelines, contractual penalties, and client commitments on the line, construction firms are statistically more likely to pay ransoms rather than endure weeks of downtime during recovery. Attackers factor this in.

There's also a fourth factor that's becoming increasingly relevant: the supply chain. Construction projects involve multiple subcontractors, vendors, equipment suppliers, and consultants — all potentially connected to your network. A single breach at a less-secure subcontractor can open the door to a much larger organization. The 2025 Verizon Data Breach Investigations Report found that third-party-related breaches doubled year over year, now accounting for 30% of all breaches globally.[5]

What sort of data might a construction company want to protect from cyber attacks?

More than most business owners realize. Here's what's actually at risk in a typical Canadian construction firm:

Project files and blueprints — Architectural drawings, structural plans, BIM models. These represent years of work and significant competitive value. In the wrong hands, they're leverage.

Financial records and banking credentials — Project budgets, payment schedules, vendor banking details. Business Email Compromise (BEC) attacks — where criminals impersonate executives or suppliers to redirect payments — are surging in construction specifically because of the high volume of financial transactions between parties.

Client and employee personal data — Under Quebec's Law 25 and Canada's PIPEDA, a breach of personal data carries legal notification obligations and potential fines. A ransomware attack that exposes client or employee records isn't just an operational crisis — it's a compliance one. (We covered the specifics of Law 25 obligations in our Bill 25 compliance blog.)

IoT and connected site devices — GPS trackers, smart cameras, access control systems, environmental sensors, drones. As job sites become more connected, each device represents a potential entry point. The Canadian Centre for Cyber Security specifically warns that IoT devices in smart buildings are particularly vulnerable, as a single compromised connection can expose entire networks.[4]

Government and infrastructure contract data — Construction firms working on public sector projects may hold sensitive information that makes them targets not just for financial extortion but for politically motivated attacks or competitive intelligence gathering.

Not sure what your biggest exposure is? Explore Resitek's cybersecurity services resitek.com/cybersecurity or book a free consultation resitek.com/consultations with our team. Call 514-447-7840.

What is true for 98% of all cyber attacks?

Social engineering — the practice of manipulating people rather than exploiting technology — is involved in the overwhelming majority of successful cyberattacks. A phishing email that tricks an employee into clicking a malicious link or handing over credentials doesn't require sophisticated hacking skills. It requires a convincing story and a moment of distraction.

For construction companies, this is especially relevant. Your workforce is distributed — some people in the office, others on job sites, many working from personal devices or shared laptops. They're busy, often context-switching rapidly between tasks. A fraudulent invoice from a "subcontractor," an urgent email from the "project owner," a text message with a link to "updated site documents" — these are the actual attack vectors hitting Canadian construction firms right now.

Phishing targets construction 1% more frequently than other industries, according to research cited in security industry analysis.[6] That might sound small, but when you're already in the top three most targeted sectors, incremental exposure matters.

The answer isn't to blame your team. It's to train them — consistently, practically, and with real examples from their industry. A site supervisor who can recognize a fraudulent supplier invoice is worth more to your cybersecurity posture than any software tool.

What security is needed on a construction company?

The Canadian Construction Association (CCA) and the Canadian Centre for Cyber Security both recommend a layered approach that accounts for the unique structure of construction operations — distributed teams, multiple vendors, connected equipment, and high financial transaction volumes.[7]

Here's what that actually looks like in practice for a growing Montreal or Toronto construction firm:

Multi-Factor Authentication (MFA) on everything — Email, project management platforms, banking portals, remote access. This single control blocks the vast majority of credential-based attacks. It costs almost nothing to implement and stops attacks that would otherwise succeed.

Employee phishing training — Regular, practical training with real construction-industry examples. Not a one-hour annual compliance video — ongoing awareness with simulated phishing tests so your team builds the muscle memory to pause before clicking.

Endpoint protection on every device — Every laptop, tablet, and device that touches your network needs up-to-date endpoint detection and response (EDR) software. This includes devices used by staff working from home or on job sites.

Secure, tested backups — Offsite, encrypted backups that are tested regularly. This is your insurance policy. If ransomware hits and you have clean backups from the previous day, you have options. If you don't, you're negotiating. A 2025 Sophos report found that 94% of ransomware victims reported attackers targeted their backup systems — which means your backups need to be isolated and protected, not just stored.[8]

Vendor and subcontractor access controls — Every third party with access to your systems or network is a potential entry point. Audit who has access, enforce strong authentication for external logins, and revoke access immediately when a vendor relationship ends.

An incident response plan — Know what you do when — not if — something happens. Who calls IT? Who notifies clients? Who contacts law enforcement? Having a plan in place dramatically reduces recovery time and limits the damage.

What causes 95% of all cybersecurity breaches?

Human error. Not sophisticated zero-day exploits. Not nation-state hackers. The overwhelming majority of breaches trace back to a person — clicking a link they shouldn't have, using a weak password, misconfiguring a system, or falling for a social engineering attack.

For construction companies, this creates both a problem and an opportunity. The problem: your team is busy, distributed, and often working in environments where cybersecurity isn't top of mind. The opportunity: because the root cause is human behaviour, it's also one of the most fixable vulnerabilities you have.

The fix isn't complicated. It's consistent training, clear policies, and a culture where staff feel comfortable reporting something suspicious without fear of embarrassment. Pair that with the right technical controls — MFA, endpoint protection, email filtering, secure backups — and you've meaningfully reduced your risk profile without needing a full-time security team.

For growing construction firms in Montreal and Toronto with 20 to 80 employees, managed IT and cybersecurity services are often the most cost-effective path to getting these controls in place. You get over 20 years of Canadian MSP expertise without the cost of building an internal security function from scratch. (If you want to understand what that actually looks like day-to-day, our blog on what a managed IT provider actually does breaks it down in plain English.)

What is the biggest problem in the construction industry right now?

Everyone talks about labour shortages — and yes, finding skilled tradespeople is a genuine challenge. But there's a less visible problem growing quietly in the background: the digital infrastructure holding your projects together is increasingly under attack, and most firms aren't ready.

The construction sector's rapid adoption of digital tools — cloud-based project management, BIM software, connected job site equipment, mobile apps for subcontractors — has massively increased efficiency. It has also massively increased attack surface. Every new platform, every new integration, every new device is a potential entry point for an attacker.

Between 2023 and 2024, phishing attacks on Canadian construction companies increased by 83% while ransomware attacks grew by 41% — and that was before the current wave of AI-powered attacks made phishing emails faster, cheaper, and harder to detect.

The businesses that come out of this period intact won't be the ones that got lucky. They'll be the ones that treated cybersecurity the same way they treat job site safety — as a non-negotiable operational standard, not an afterthought.

Looking for managed IT and cybersecurity services in Montreal or Toronto built for construction and engineering firms? Explore what Resitek does resitek.com/managed-it-services or book a free consultation resitek.com/consultations with our team. Call 514-447-7840.

Sources and references

1. Rapid7, Threat Landscape of the Building and Construction Sector Part Two: Ransomware https://www.rapid7.com/blog/post/tr-building-construction-sector-threat-landscape-ransomware/
2. The Cannata Report, Ransomware Attacks Soar with a 45% Increase in 2025 https://www.thecannatareport.com/ransomware-attacks-soar-by-45-percent/
3. Canadian Centre for Cyber Security, Ransomware Threat Outlook 2025-2027 https://www.cyber.gc.ca/en/guidance/ransomware-threat-outlook-2025-2027
4. Northbridge Insurance, Cyber Risks in the Construction Industry https://www.northbridgeinsurance.ca/blog/new-cyber-risks-construction-industry/
5. Verizon, 2025 Data Breach Investigations Report https://www.verizon.com/business/resources/reports/dbir/
6. Canadian Construction Association, Education: Your First Line of Defence Against Cyber Attacks https://www.cca-acc.com/plus/education-your-first-line-of-defence-against-cyber-attacks/
7. Sophos, State of Ransomware 2025 https://www.sophos.com/en-us/whitepaper/state-of-ransomware

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