Scaling Security: Tailoring Programs for Distributed Organizations

Our LinkedIn: Hillstrong Group Security

Author’s LinkedIn: Roger Hill

Scaling an operational technology (OT) cybersecurity program across a global enterprise requires balancing a centralized strategy and localized execution. For CISOs and CIOs, the challenge extends beyond deploying tools or meeting regulatory requirements—it’s about ensuring business continuity, strengthening operational resilience, and safeguarding revenue streams on a large scale. Each site within a global organization has distinct risks, operational dynamics, and maturity levels, necessitating a tailored and strategic approach to security.

This chapter explores how leaders can create scalable OT security programs that address the complexities of diverse, geographically distributed operations while aligning with strategic business objectives.

Establishing a Centralized Strategy with Localized Flexibility

At its core, a scalable OT security program begins with a strong centralized framework. This framework provides consistency in governance, policy, and oversight while allowing individual sites to adapt implementation based on their unique contexts.

Centralized strategies should focus on:

• Universal Policies: Core requirements such as access control, network segmentation, and incident response protocols must be standardized across the organization.

• Governance Models: Clear lines of accountability, with central oversight ensuring alignment while empowering local teams to act within defined boundaries.

• Standardized Toolsets: Deploy a standard suite of monitoring, detection, and compliance management tools to simplify integration and provide uniform data visibility.

Flexibility is equally critical. A European production plant adhering to the NIS2 Directive may require a different compliance timeline than a Southeast Asian site focused on supply chain efficiency. Allowing localized customization within a centralized framework ensures that security measures are practical and effective.

Mapping and Prioritizing Operational Risks

CISOs and CIOs must map the organization’s operational landscape to scale effectively, categorizing sites based on their criticality and risk profiles. This process involves:

• Tiering Sites: Segment facilities into strategic, supportive, and peripheral tiers based on their operational and financial importance. For example, a strategic site producing unique components for a global supply chain demands advanced threat detection capabilities, while peripheral sites may require only baseline controls.

• Interdependency Analysis: Document interdependencies between sites. For instance, a ransomware attack on a peripheral facility could cascade into delays at a strategic plant reliant on shared systems.

• Risk Modeling: Conduct scenario planning to assess the potential impact of disruptions, such as downtime costs, safety incidents, or regulatory penalties. Quantifying these risks enables data-driven prioritization.

By aligning resources with each site’s criticality, security leaders can ensure that investments deliver the most significant operational and financial impact.

Leveraging Technology to Enable Scalability

Technology is critical in scaling OT security programs, but success requires selecting tools that align with the operational realities of OT environments. While certain technologies are supportive, others take center stage in addressing unique OT challenges. The following strategies reflect these realities:

• Centralized Visibility: Tools like Security Information and Event Management (SIEM) platforms offer value as ancillary controls, providing a unified view across IT and OT environments. However, in OT systems, particularly at Level 2 with embedded or RTOS devices, most assets lack the event capability to support SYSLOG. This limitation makes SIEMs insufficient as standalone solutions for detecting security events. Instead, they should complement more OT-specific technologies. In addition, OT security correlation rules should be much more operational-centric vs. DNS-centric.

• OT Network Threat Detection: Industrial networks demand specialized threat detection solutions to characterize, understand, and identify risks. These tools analyze communication patterns, protocols, and device behaviors unique to OT environments. Organizations can detect anomalies and threats even in systems where endpoint telemetry is unavailable by focusing on network-level visibility.

• Mitigation Over Automation for Patching: Automation for patch management in OT remains impractical given the lack of tools that understand OT-specific contexts, such as compatibility with unique configurations or vendor-required testing cycles. Instead, mitigation through alternative controls—such as network segmentation, compensating measures, or robust vulnerability management frameworks—offers a more realistic and practical approach to reducing risk. Having a robust OT vulnerability management process is crucial.

Robust training programs must support the adoption of these technologies. Centralized training initiatives should educate local teams on how to use tools effectively, detect and respond to threats, and implement mitigation strategies tailored to their environments. Empowering teams with these skills ensures that technology investments translate into actionable improvements in security.

Addressing Cultural and Regional Differences

Scaling across global operations requires sensitivity to cultural and regulatory nuances. Resistance to centrally mandated security measures often stems from misalignment with local priorities. To navigate this challenge:

• Engage Local Leaders: Involve site managers and regional teams in designing and rolling out security initiatives. Their input ensures measures are practical and builds buy-in.

• Tailored Training: Develop region-specific training programs that address local regulatory requirements, such as GDPR compliance in Europe or CISA guidelines in the U.S.

• Localized Communication: Translate policies and resources into local languages and contexts, demonstrating respect for regional differences and fostering understanding.

Building trust at the local level is essential for successful implementation. Regular site visits by central teams and collaborative workshops can bridge gaps and reinforce alignment.

Establishing Feedback Loops and Continuous Improvement

A scalable security program isn’t static; it evolves. Embedding continuous feedback mechanisms ensures the program adapts to emerging risks and operational changes.

• Metrics and Reporting: Establish KPIs that measure program effectiveness, such as time to remediate vulnerabilities, compliance rates, and incident response times. Use these metrics to inform strategy adjustments.

• Local Feedback Channels: Create forums or committees where site teams can share challenges, successes, and lessons learned. This bottom-up feedback is invaluable for refining policies and identifying gaps.

• Audit Cycles: Regularly audit sites to assess policy adherence and identify improvement opportunities. Audits should prioritize high-risk or strategic sites and cycle through supportive and peripheral locations.

Investing in a continuous learning culture supported by data-driven insights ensures the program remains resilient and responsive.

Takeaways

Scaling an OT security program across distributed operations requires more than deploying tools and policies. It demands strategic alignment, adaptability, and collaboration. CISOs and CIOs who succeed in this endeavor focus on:

• Building a centralized framework that allows for local flexibility.

• Prioritizing investments based on site criticality and operational risk.

• Leveraging technology to provide visibility and automation at scale.

• Addressing cultural differences and engaging local teams as partners.

• Embedding continuous improvement mechanisms to adapt to evolving challenges.

The result is a secure operational environment and a more resilient and efficient organization. By balancing consistency with adaptability, Security Professionals, CISOs and CIOs can ensure their OT security programs are scalable, sustainable, and aligned with the organization’s strategic goals.