Operational Technology Security Assurance

We conduct comprehensive assessments covering asset inventories, network architecture, protocol vulnerabilities, access controls, patch management, backup capabilities, supply chain security, monitoring maturity, incident readiness, and compliance adherence, including obligations under the SOCI Act. Our risk analysis addresses confidentiality, integrity, availability, and safety domains, mapping findings to IEC 62443 security levels and business impact.  

We deliver a prioritised remediation roadmap, detailed gap report, cost plans with milestones, and an executive-friendly risk narrative. Our governance advisory integrates OT cybersecurity frameworks with enterprise risk management, policy development, role definitions, metrics, and reporting aligned to IEC 62443, AECSF, NIST CSF, ISO 27001, and legal/regulatory requirements including the SOCI Act.

This unified approach ensures robust oversight, continuous improvement, and demonstrable compliance.

We design defence-in-depth OT architectures using the Purdue Model and IEC 62443 zone-and-conduit concepts. Our security boundaries isolate safety systems, supervisory control, operations management, and enterprise IT networks.

We leverage industrial firewalls, unidirectional gateways, DMZ topologies, data diodes, protocol whitelisting, and deep packet inspection, balancing stringent security with operational continuity and performance.

Our asset discovery combines passive and active methods to identify PLCs, RTUs, HMIs, SCADA servers, historians, and safety systems without operational disruption. Detailed inventories include device types, firmware versions, protocols, and criticality ratings.

Vulnerabilities and risks in OT and IIoT systems are identified through a combination of passive and active vulnerability assessments, penetration testing, segmentation testing, and thorough configuration reviews. Our vulnerability management process includes authenticated scanning scheduled within maintenance windows to minimise operational impact, cross-referencing findings with ICS-CERT advisories, and prioritising remediation efforts based on their potential impact on safety. Where immediate patching is not feasible, we design and implement compensating controls to ensure continued protection.

We deliver specialised OT monitoring solutions that combine network traffic analysis, protocol anomaly detection, and SIEM integration tailored for OT environments. Our expertise covers key industrial protocols such as Modbus, DNP3, OPC, PROFINET, and Ethernet/IP, enabling the early detection of unauthorised commands, configuration anomalies, and suspicious behaviours.

We establish operational baselines, fine-tune detection rules to minimise false positives, and ensure seamless integration with Security Operations Centre (SOC) workflows. Passive monitoring techniques using TAPs and SPAN ports are employed to avoid impacting network performance.

Beyond monitoring, we integrate OT-specific threat intelligence from industry ISACs and other relevant sources, enabling proactive threat hunting and rapid identification of emerging risks. This combined approach strengthens situational awareness and accelerates incident response, helping to safeguard critical OT assets and maintain operational continuity.

We develop OT-tailored incident response plans defining scope, roles, severity levels, escalation authorities, communication protocols, evidence collection, containment, and recovery workflows. Playbooks cover ransomware, unauthorised access, supply chain risks, protocol manipulation, and ICS malware. Tabletop simulations, procedure testing, and training in OT forensics and team coordination enhance preparedness.

We implement secure remote access solutions featuring dedicated network segments, multifactor authentication, session monitoring, time-restricted access, and least privilege principles. Vendor management encompasses security evaluations, contractual safeguards, approval processes, activity monitoring, and periodic reviews. Emergency access procedures and thorough audit logging ensure accountability.