Construction Is In Ransomware’s Crosshairs: What Contractors Need to Know

Construction companies seem to plan for everything. But once a jobsite goes live, critical systems may be running through an aging trailer router, dozens of personal devices may be connecting to the network, and all the important passwords may still be written on a piece of paper in the top desk drawer.

That’s a common industry disconnect these days, but it’s getting harder to ignore when project and payroll data, invoices, and payments are constantly moving between field teams, vendors, and subcontractors. Each of those gaps gives a ransomware attacker another possible way into the business.

For general and specialty contractors, a cyberattack doesn’t stay in the IT department. It can block access to plans, interrupt payroll, delay payments, and leave crews without the information they need to keep working. In one industry survey, 41% of construction companies said that cybersecurity was their biggest IT challenge.¹

The problem is that when more of today’s jobsites are run on technology, yesterday’s security practices can’t protect them.

Why Ransomware Has Its Sights on Construction

In September 2025, construction and engineering accounted for 11.4% of reported ransomware attacks, the largest share of any industry.² Given the nature of the industry, that’s understandable. Criminals love predictable schedules. And construction is built on regular payroll, invoices, and wire transfers that follow schedules criminals can watch for and exploit. If a ransomware attack takes critical systems offline, crews lose access to plans, payroll stops, and project deadlines slip.

Expecting the same IT team that keeps the day-to-day business running to take on the burden on handling cybersecurity isn’t realistic. It’s no wonder that 38% of contractors say they don’t have the time to onboard new technology and train employees on how to use it.³ And cloud providers handle the infrastructure, but they don’t secure users, monitor threats, test backups, and respond to an incident.

Moving everything to a large public cloud may sound easy, but it doesn’t solve the staffing problem. Contractors still have to decide where each system belongs and who will manage it. A managed hybrid cloud lets you keep flexible workloads in the public cloud and put systems that need steady performance and predictable costs in a managed private cloud.

What You Can Do In the Next 30 Days

Improving security in construction doesn’t mean you should close every security gap at one time. A more practical approach is to apply a few practical steps your team can get started on today.

1. Use multi-factor authentication (MFA), starting with critical systems including email, financial systems, remote access, and administrator accounts.
2. Find every device connected to the system, including laptops, phones, tablets, and computers in offices, trailers, and job sites.
3. Patch the systems that pose the greatest risk, first focusing on internet-facing systems and devices with known security problems.
4. Check who has access and remove former employees, vendors, and subcontractors who no longer need to be in your systems.
5. Test backups, instead of assuming they’ll be there when needed.
6. Decide what happens when an alert comes in after hours, including identifying the person who’ll respond, how they’ll be reached, and what they’re authorized to do.
7. Work toward a more formal security program, using the NIST Cybersecurity Framework 2.03 to organize your policies, controls, and reporting. If you plan to pursue Department of War (DoW) contracts, start preparing for CMMC early. Your security program should support your eligibility, not become a last-minute hurdle.⁴

Close the Security Gap with NexusTek

NexusTek is ready to help bring your IT operations, cybersecurity, and cloud and data protection together in one managed service that’s purpose-built for GCs and specialty contractors. With 24/7 coverage, onsite engineering, and virtual CISO (vCISO) guidance, we help keep field and office systems secure, available, and ready to recover. Ask for a cybersecurity assessment from today to understand your current security environment and build a realistic plan for next steps.

Learn more. https://www.nexustek.com/contact-us 

Sources:

1. AGC, Construction Firms Predict Strong Demand For Certain Private-sector & Most Types Of Public-Sector Work In 2025, But Worry About Labor & Materials Prices, January 2025
2. ENR, Building Safeguards: A Deeper Look at Cybersecurity in the Construction Industry, March 2026
3. NSF.org, NIST 800-171 Compliance Assessment Services, accessed September 2026
4. CISA.gov, Cybersecurity Maturity Model Certification 2.0 Program, accessed September 2026