Industrial Control & OT Security

Glexia's OT/ICS security practice secures the industrial control systems that run the physical world — from PLCs and DCSs on plant floors to SCADA networks across energy, water, oil & gas, chemical, and discrete manufacturing. Our engagements are led by practitioners credentialed under ISA/IEC 62443 who have run IR for live OT incidents. We design around safety, availability, and determinism first — with a strict hands-off-to-control-loops philosophy so detection, assessment, and hardening never disrupt physical operations or endanger personnel.

Command view Operating model Timeline Deliverables FAQ

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Command view

What this service changes operationally

Glexia industrial control security protects operational technology with a safety-first approach. We inventory assets passively, model Purdue zones and conduits, validate remote access, improve industrial detection, and align cyber controls to production realities where uptime, safety, and process integrity matter most.

OT Passive-first discovery

Industrial assets, protocols, data flows, and remote access paths are mapped without disrupting production systems.

62443 Zone and conduit design

Segmentation, industrial DMZ, remote access, and monitoring controls are aligned to ISA/IEC 62443 principles.

IR Operational resilience

OT incident playbooks, tabletop exercises, and recovery priorities are built around safety and continuity.

Operating model

How Glexia runs the service

The engagement is organized into clear delivery lanes so leaders can see what is being assessed, what is changing, and how progress is measured.

Asset discovery and exposure mapping

We establish visibility into controllers, engineering workstations, HMIs, historians, safety systems, remote access, and IT/OT trust relationships using passive methods wherever possible.

Passive network discovery and OT protocol analysis
Purdue model, data-flow, and remote access mapping
Crown-jewel process, safety, and production dependency identification

Segmentation and access hardening

Controls are designed around operational constraints, maintenance workflows, vendor access, safety requirements, and legacy equipment that cannot simply be patched or scanned like IT assets.

Industrial DMZ, firewall, and zone-conduit architecture
Vendor remote access, jump host, and privileged session review
Compensating controls for legacy, unsupported, or safety-critical systems

OT detection and response readiness

We improve monitoring and response with OT-aware detections, escalation paths, tabletop exercises, backup validation, and incident playbooks that separate cyber urgency from process-safety decisions.

Nozomi, Dragos, Claroty, SIEM, and network telemetry integration
OT incident response playbooks and executive tabletop scenarios
Recovery prioritization for process, safety, and business continuity

Delivery path

From kickoff to measurable outcomes

01 Week 0-2

Plan around safety and operations

Confirm production constraints, maintenance windows, safety contacts, protected systems, network taps, and change controls.

02 Week 2-5

Map assets and conduits

Passively identify OT assets, protocols, data flows, remote access paths, trust boundaries, and critical process dependencies.

03 Week 5-8

Prioritize hardening

Rank segmentation, access, monitoring, backup, vulnerability, and governance gaps by operational and safety impact.

04 Week 8-12

Exercise resilience

Deliver architecture recommendations, detection use cases, OT incident playbooks, tabletop results, and remediation governance.

Deliverables

Artifacts your team can operate from

OT asset and protocol inventoryPurdue zone and conduit mapRemote access risk assessmentIndustrial DMZ hardening planOT detection use-case matrixOT incident response tabletop package

Common integrations

Nozomi NetworksDragosClarotyTenable OTPalo Alto firewallsSplunk and Microsoft SentinelHistorian and engineering workstation telemetryBackup and recovery platforms

Best fit

Energy, manufacturing, utilities, transportation, and process environments with OT/IT convergence risk
Teams aligning to ISA/IEC 62443, NERC CIP, TSA directives, NIST SP 800-82, or customer assurance requirements
Operators that need better OT visibility and resilience without disrupting production equipment

Service FAQ

Industrial Control & OT Security questions leaders ask

Short answers for scope, operating model, and implementation decisions before a formal engagement begins.

Will OT assessments disrupt production systems?

The approach is passive-first and safety-led. We plan with operations, review change controls, use approved collection points, avoid intrusive scanning unless explicitly authorized, and coordinate all activity around production constraints and safety requirements.

Do you support ISA/IEC 62443 and NERC CIP alignment?

Yes. We can map controls to ISA/IEC 62443, NERC CIP, NIST SP 800-82, TSA security directives, and internal engineering standards. Recommendations are written around zones, conduits, remote access, asset visibility, monitoring, and resilience.

Can Glexia help with OT incident response planning?

Yes. We build OT-specific playbooks, tabletop scenarios, escalation paths, evidence collection guidance, recovery priorities, and executive decision models. The process separates cyber containment from process-safety and operational continuity decisions.

Capabilities

ISA/IEC 62443 zone & conduit architecture design

Passive OT asset discovery and vulnerability mapping

ICS/SCADA threat detection (Nozomi, Dragos, Claroty)

Purdue Model segmentation and industrial DMZ hardening

OT-aware incident response and tabletop exercises

NERC CIP, TSA Pipeline, and NIST SP 800-82 compliance

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Environments we instrument

Production assets — observed, segmented, defended

From process plants to grid substations, our OT engagements operate on the live equipment that carries the load. Every approach is passive-first, reviewed against ISA/IEC 62443 zone & conduit doctrine, and rehearsed before a single packet leaves a SPAN port.

Process pipelines and refinery infrastructure illuminated at dusk — Process & energy
Refineries, pipelines, and chemical plants

Distributed control systems, safety-instrumented systems, and cross-vendor SCADA stacks — secured against deterministic-process risk without lifting a single trip.

High-voltage transformer and disconnect switches at an electrical substation — Power & grid
Substations, generation, and transmission

NERC CIP-aligned segmentation, IED inventory, and protective-relay traffic baselining for BES Cyber Systems — without inserting agents on equipment that must never reboot.

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