OT Security
Operational technology security for ICS/SCADA environments where availability is paramount and traditional patching may halt production. Asset discovery, IT/OT segmentation, behavioural baselining and change-controlled anomaly response designed for industrial control networks.
Overview
IT security tools scan for vulnerabilities, apply patches, and restart services — all of which can disrupt or damage operational technology (OT) environments where uptime, real-time control, and equipment safety take priority over data confidentiality. OT Security provides visibility and protection for industrial control systems, SCADA, PLCs, and manufacturing networks using techniques designed for environments that cannot tolerate active scanning, unscheduled reboots, or software updates that alter deterministic behaviour.
Clevertek scopes every engagement to your environment — capacity, sites, compliance and support model — so you get a tailored plan rather than a fixed SKU. Pricing is quote-only, and our solutions architects will work through your requirements before any proposal.
Our approach
We deploy passive monitoring and network traffic analysis in your OT environment — no active scanning, no agents on controllers, no risk of disrupting production processes. We build a baseline of normal traffic patterns — which devices talk to which, on which protocols (Modbus, DNP3, OPC-UA, Profinet, S7), at what cadence — and alert on anomalies that indicate compromise, misconfiguration, or device failure. Our OT-specific playbooks cover the unique constraints of industrial environments: no-patch zones, air-gapped segments, and vendor-restricted devices.
Why work with us
Passive monitoring — no active scanning
Network traffic is observed, not probed. No active scans, no agents on controllers, no risk of disrupting deterministic OT processes.
OT protocol deep inspection
Parses and inspects Modbus, DNP3, OPC-UA, Profinet, S7, and IEC 61850 at the protocol level — not just IP-layer metadata.
Baseline behaviour profiling
Learns normal traffic patterns per device — which controllers talk to which HMIs, what protocols they use, at what cadence — and alerts on deviations.
IT/OT visibility gap analysis
Maps where IT and OT networks connect — firewalls, jump boxes, VPNs, one-way diodes — and identifies paths an attacker could use to pivot from IT into OT.
No-patch zone management
For vendor-restricted or unpatchable devices — virtual patching through network-level protections, anomaly detection, and segment-level containment.
OT-specific incident playbooks
Response procedures designed for OT constraints — containment without disrupting production, forensics without rebooting controllers, communication protocols for engineering teams.
Key benefits
What this solution delivers for your business.
Visibility into previously blind OT networks
Most OT environments have minimal monitoring. Passive network analysis provides device inventory, traffic baselines, and anomaly detection without changes to production systems.
Early detection of OT-specific threats
Protocol-level inspection detects manipulation of control values, unauthorised configuration changes, and commands from unexpected sources — signs of compromise IT tools would miss.
Reduce risk of IT-to-OT pivoting
Visibility into IT/OT boundary paths identifies and closes routes an attacker could use to move from compromised IT systems into OT networks.
Compliance with OT security standards
IEC 62443, NIST SP 800-82, and industry-specific OT security frameworks supported — with documented monitoring coverage and incident response procedures.
Production-safe security operations
No active scanning, no agents on controllers, no patching cycles that might alter equipment behaviour. Security that respects OT uptime requirements.
Vendor-agnostic deployment
Works with any OT environment regardless of controller vendor — Siemens, Rockwell, Schneider, ABB, Honeywell — at the network level, not the device level.
What's included
Part of this managed service.
Passive network monitoring
Traffic observation via SPAN/mirror ports or network TAPs — no active probing, no production impact.
- Passive traffic collection
- No active scanning
- SPAN/mirror or TAP
- No production impact
OT protocol inspection
Deep packet inspection of industrial protocols — Modbus, DNP3, OPC-UA, Profinet, S7, IEC 61850, and more.
- Modbus/TCP
- DNP3
- OPC-UA
- Profinet/S7/IEC 61850
Baseline behaviour profiling
Learns normal traffic patterns per device — expected communication pairs, protocols, and cadence — and detects anomalies.
- Device inventory (passive)
- Traffic baseline per device
- Protocol usage profiling
- Anomaly detection
IT/OT boundary mapping
Identifies and documents connections between IT and OT networks — including unmanaged or undocumented paths.
- IT/OT connection mapping
- Firewall rule analysis
- Jump box / VPN identification
- One-way diode validation
Virtual patching for unpatchable devices
Network-level protections for devices that cannot be patched — IPS rules, traffic filtering, and anomaly-based blocking.
- Virtual patching rules
- Traffic filtering
- Protocol validation
- Device-specific rules
Where it helps
Real-world scenarios where this solution delivers measurable outcomes.
Manufacturing OT security
Deploy passive monitoring across a plant network — visibility into PLCs, HMIs, and SCADA traffic with anomaly detection for unauthorised commands or configuration changes.
Energy and utilities
Protect substation automation, grid control systems, and pipeline SCADA — IEC 61850 and DNP3 inspection with IT/OT boundary visibility.
Pharmaceutical production
Secure GMP-regulated production environments where patching and software changes require validation — passive monitoring without production disruption.
Questions buyers actually ask
Will this affect my production systems?
No. Monitoring is entirely passive — traffic is mirrored from network switches or collected through TAPs. No packets are sent into the production network, no agents are installed on controllers.
Can I get OT security without an OT team?
Yes. The monitoring platform generates alerts in plain language — "PLC-03 received a write command from an unknown IP" — without requiring deep OT protocol expertise to interpret.
How do you handle air-gapped OT networks?
All monitoring equipment is deployed within the air-gapped network. Alert data is exfiltrated through a one-way diode or periodic synchronisation — no inbound connectivity to the OT network.
What if my OT vendor does not allow monitoring?
Passive monitoring through network port mirroring does not introduce any software, agents, or active probing to OT devices — it is invisible to the controllers themselves and vendor-approved in most environments.
Ready to scope a solution?
Talk to a Clevertek solutions architect about your requirements — no obligation.