Authorized academic / laboratory cybersecurity work inspired by industrial IT/OT environments. The scenario is fictitious and intentionally excludes company-specific architecture, production data, internal captures, IP addresses and hostnames.
CASE STUDY / Security assessment
IT/OT Cybersecurity Assessment
From asset visibility to a prioritized industrial security roadmap.
A public-safe case study showing how an industrial security assessment can turn broad risk themes into defensible segmentation, detection and remediation decisions.
01 / Overview
From context to a defensible security objective.
Evaluate cybersecurity risks and explore improvements in network segmentation, visibility, detection and remediation.
- Illustrative IT, DMZ and OT security zones
- Asset identification and exposure review
- Network traffic visibility and IDS concepts
- Risk-based remediation planning
- Balance security improvements with availability and operational continuity.
- Prioritize visibility before proposing controls that depend on reliable asset context.
- Describe risks without exposing confidential or organization-specific information.
- Assessment structureStructured the assessment around assets, trust boundaries, visibility and prioritized remediation.
- Illustrative target stateProduced a defensible target segmentation concept for a fictitious industrial environment.
- Framework alignmentMapped improvement themes to recognized industrial and cybersecurity frameworks.
02 / Methodology
A repeatable path from discovery to validation.
- 01Discover
- 02Assess
- 03Analyze
- 04Segment
- 05Detect
- 06Remediate
- 07Validate
03 / Architecture
Security boundaries made understandable.
The diagrams communicate security boundaries only. They do not reproduce any real organization or industrial network.
Before — limited trust boundaries
Illustrative flat path with insufficient separation between enterprise and industrial zones.
- IT Network
- Shared trust path
- OT Network
After — defense in depth
Illustrative target state using controlled conduits and an industrial DMZ.
- IT Network
- Firewall
- Industrial DMZ
- Firewall
- OT Network
Illustrative architecture only — no real organization, internal address, hostname or confidential topology is represented.
Tools
- pfSense
- Snort
- Nmap
- Wireshark
- GNS3
- VMware
- Linux
Security frameworks
- IEC 62443
- NIST CSF 2.0
- MITRE ATT&CK for ICS
04 / Findings
Risk described in operationally useful terms.
CVSS is shown only when a verified vulnerability and a real scoring vector exist. These architectural risks use likelihood and impact instead.
Trust boundaries require stronger segmentation
A flat or broadly trusted IT/OT path can increase the potential blast radius of a compromised enterprise asset.
- Likelihood
- Possible
- Impact
- High
- Risk level
- High
Evidence
Illustrative laboratory review identified an architecture pattern with limited intermediary security zones.
Recommendation
Introduce explicit zones and conduits, an industrial DMZ and tightly scoped firewall policies based on required communication flows.
Framework mappingIEC 62443 zones and conduitsNIST CSF 2.0 — ProtectMITRE ATT&CK for ICS — Network Segmentation
Review remediation Asset context and ownership need consistent visibility
Incomplete asset context makes it harder to assess exposure, assign ownership and prioritize remediation safely.
- Likelihood
- Possible
- Impact
- Moderate
- Risk level
- Moderate
Evidence
The simulated assessment required a normalized inventory before risk analysis could be structured.
Recommendation
Maintain a validated asset inventory with owner, zone, criticality, supported protocols and lifecycle status.
Framework mappingNIST CSF 2.0 — IdentifyIEC 62443 asset owner responsibilities
Review remediation Detection should focus on high-value conduits
Limited monitoring at zone boundaries can delay the identification of unauthorized discovery, unusual protocols or lateral movement.
- Likelihood
- Possible
- Impact
- High
- Risk level
- High
Evidence
The laboratory topology showed where passive traffic analysis and IDS concepts could add visibility without active interference.
Recommendation
Place passive monitoring at selected conduits, baseline expected traffic and tune detections against the approved communication matrix.
Framework mappingNIST CSF 2.0 — DetectMITRE ATT&CK for ICS — Network Service Scanning
Review remediation 05 / Remediation
Recommendations tied to expected security improvement.
Trust boundaries require stronger segmentation
Create layered boundaries with an industrial DMZ and allow-list only documented flows.
Problem
Enterprise and industrial assets share an overly broad trust path.
Impact
Compromise could propagate across security domains and affect critical operational assets.
Expected improvement
Reduced attack surface, constrained lateral movement and clearer control ownership.
Before
IT
Direct shared path
OT
After
IT
Firewall
DMZ
Firewall
OT
Illustrative architecture — not a real environment
Asset context and ownership need consistent visibility
Establish a repeatable discovery and validation process with operational owners.
Problem
Security decisions are made without consistent asset criticality and ownership context.
Impact
Important exposures may be missed or remediated in the wrong order.
Expected improvement
More reliable prioritization and lower risk of disruptive remediation.
Detection should focus on high-value conduits
Use passive sensors and tuned IDS rules at defined trust boundaries.
Problem
Critical inter-zone traffic lacks focused security telemetry.
Impact
Suspicious activity can remain undetected until it affects a wider part of the environment.
Expected improvement
Earlier detection with minimal impact on sensitive industrial communications.
06 / Lessons learned
What the work changed in the way security is approached.
Asset context is a prerequisite for meaningful risk prioritization.
Availability and safety constraints must shape every OT security recommendation.
Detection becomes more actionable when it is aligned with zones, conduits and expected traffic.
A useful assessment explains both the security benefit and the operational trade-off of remediation.
07 / References
Knowledge sources used to structure the analysis.
- IEC 62443 — industrial automation and control systems security
- NIST Cybersecurity Framework 2.0
- MITRE ATT&CK for ICS