Ransomware Threats to North America's Critical Infrastructure: A 2026 Assessment

Executive Summary

As of April 2026, ransomware attacks on North America's critical infrastructure have intensified, posing significant risks to sectors including energy, water systems, healthcare, and finance. Notably, groups such as Qilin and Interlock have emerged as primary threats, utilizing advanced techniques to infiltrate and disrupt essential services.

Current Threat Landscape

In 2025, global ransomware incidents surged by 50% year-over-year, with North America accounting for 56% of these attacks. The industrial sector was particularly targeted, comprising 28% of all attacks. (nccgroup.com)

Key Threat Actors

• Qilin: Dominated the ransomware landscape in 2025, responsible for 13% of global attacks. (nccgroup.com) Qilin operates on a Ransomware-as-a-Service (RaaS) model, providing sophisticated malware tools to affiliates. Their attacks often involve double-extortion tactics, encrypting data and threatening public release to pressure victims into compliance.

• Interlock: First identified in September 2024, Interlock has targeted businesses and critical infrastructure in North America and Europe. Utilizing drive-by downloads and deceptive tactics, they deploy tools like PowerShell-based Remote Access Trojans (RATs), keyloggers, and Cobalt Strike for lateral movement. Their encryption affects both Windows and Linux systems, appending files with .interlock or .1nt3rlock extensions. (techradar.com)

Targeted Sectors

• Energy Sector: Ransomware attacks have disrupted operations in power grids and energy facilities. For instance, the 2025 cyberattack on the Polish power grid targeted both IT and industrial devices, affecting renewable energy plants and combined heat and power plants. (en.wikipedia.org)

• Water Systems: Hacktivist groups have increasingly targeted Industrial Control Systems (ICS) in water facilities. Incidents include tampering with water pressure valves and manipulating Automated Tank Gauges, leading to operational disruptions. (techradar.com)

• Healthcare Sector: Ransomware attacks have compromised healthcare organizations, leading to data breaches and operational halts. The 2025 attack on Collins Aerospace's airport check-in system disrupted travel across Europe, highlighting the broader impact on critical services. (itpro.com)

• Financial Sector: The financial industry remains a prime target, with 45% of cyberattacks on critical infrastructure in Q3 2024 directed at this sector. (blackberry.com)

Tactics and Techniques

Ransomware groups employ various methods to infiltrate systems:

• Social Engineering: Techniques such as phishing and deceptive communications are used to gain initial access.

• Exploitation of Vulnerabilities: Attackers exploit known vulnerabilities in software and hardware to gain unauthorized access.

• Lateral Movement: Once inside, attackers move laterally within networks using tools like Cobalt Strike and AnyDesk to escalate privileges and access critical systems.

Mitigation Strategies

To defend against these evolving threats, organizations should implement the following measures:

• Regular Patching: Ensure all systems and software are up-to-date to close known vulnerabilities.

• Network Segmentation: Divide networks into segments to limit the spread of attacks.

• Multi-Factor Authentication (MFA): Enforce MFA to add an additional layer of security.

• Employee Training: Educate staff on recognizing phishing attempts and other social engineering tactics.

• Incident Response Planning: Develop and regularly update incident response plans to ensure swift action during an attack.

Conclusion

The threat of ransomware attacks on critical infrastructure in North America continues to escalate, with groups like Qilin and Interlock at the forefront. Proactive measures, including robust cybersecurity practices and continuous monitoring, are essential to mitigate these risks and ensure the resilience of critical services.

Highlights:

• FBI urges users to beware worrying Interlock ransomware attacks, Published on Wednesday, July 23
• Canadian government claims hacktivists are attacking water and energy facilities, Published on Friday, October 31
• Why cyber attacks on critical national infrastructure are such a huge threat, Published on Wednesday, March 18