Building and Maintaining Operational Technology Resilience: A Critical Imperative
Vivek Valmiki
Senior Account Director UK/I, C2 Risk
Digital and physical operations are becoming more blurred in today's environment. Nowhere is this more apparent than in the realm of Operational Technology (OT), the backbone of critical infrastructure and industrial sectors. As cyber attacks on OT systems rise at an unprecedented rate, the stakes for resilience have never been higher. The consequences of a successful attack can be catastrophic, ranging from operational outages and financial loss to threats to public safety and national security.
Escalating Cyber Threats in Operational Technology Environments
Recent years have seen a dramatic surge in cyber threats targeting OT environments. According to industry reports, nearly a third of organisations experienced six or more OT security intrusions in the past year alone with a sharp increase from previous years. These attacks are not just growing in frequency, but also in sophistication and impact. Ransomware incidents in the industrial sector, for example, spiked by 87% year-on-year in 2024, making manufacturing the top target for ransomware for four consecutive years.
Why Operational Technology Systems Are Uniquely Vulnerable to Cyberattack
Unlike modern IT, OT systems prioritise uptime over security, often lacking encryption and patching, making them vulnerable as digitisation expands. The risks are not theoretical. Successful OT cyber attacks have resulted in:
halt production lines or disrupt essential services like electricity and water.
Loss of business-critical data
and intellectual property.
and, in extreme cases, even loss of life.
Building Cyber Resilience: Best Practices
As cyber threats become increasingly sophisticated, building and maintaining OT resilience is not optional, it is essential. Here are key best practices for organisations seeking to protect their OT environments:
1. Comprehensive Risk Assessment
Start by mapping OT assets, assessing risks using NIST or ISA/IEC frameworks, prioritising actions. Involve engineering, IT, and leadership stakeholders.
2. Network Segmentation and Secure Architecture
Segment OT networks from IT, using firewalls, demilitarised zones (DMZs), and industrial intrusion detection to contain threats and limit breach impact.
3. Regular Updates and Patch Management
Regularly update OT systems; for unpatchable legacy devices, implement compensating controls like network isolation to reduce vulnerability exposure.
4. Secure Remote Access
Secure remote access with strong authentication, encryption, and strict controls. Continuously monitor and log all remote activity for suspicious behaviour.
5. Continuous Monitoring and Incident Response
Deploy industrial IDS to monitor OT network traffic, detect anomalies in real-time, and regularly test incident response plans for OT scenarios.
6. Employee Training and Awareness
Regularly train staff on OT security best practices and how to recognise potential threats.
The Role of Risk Management Technology
Given the complexity and dynamic nature of OT environments, manual approaches to risk management are no longer sufficient. This is where advanced risk platforms come into play.
This advanced technology enables organisations to:
See and understand all OT risks and vulnerabilities
Monitor for new threats and compliance issues in real time
Apply consistent security standards and meet regulations
Improve teamwork between IT, OT, and partners
Automate risk reports and incident response for faster decisions
Using these tools, organisations gain holistic OT security visibility, prioritise investments, respond quickly to incidents, and ensure operational resilience.
Proactive Strategies for Operational Technology Resilience
In summary, operational technology faces evolving cyber threats, demanding continuous resilience efforts.
Vigilance, collaboration, and strong technology partnerships are essential.
For industrial and critical infrastructure organisations, proactive OT cyber resilience is vital not just for compliance but to protect public safety, business continuity, and national security.
To learn how C2 Risk can help you build robust OT resilience, visit c2risk.com.
