OT security without the panic
OT cybersecurity has attracted a lot of attention in recent years - some of it warranted, some of it vendor-driven alarm. The realistic picture for most industrial sites in Queensland is not nation-state attackers targeting your sugar mill. It is inadequate remote access controls, unmanaged USB ports, flat networks with no segmentation, and vendor connections that nobody fully understands.
These are real risks with real consequences. Ransomware that enters through a corporate network and reaches an OT network because there’s no effective segmentation has stopped production at industrial facilities in Australia. Engineering workstations infected through an unscreened USB stick have corrupted PLC programs. Remote access accounts with broad permissions and no monitoring have been used in ways they shouldn’t have been.
The good news is that the practical controls for these risks are well understood and implementable without disrupting operations.
What we do
OT security assessments - structured review of your OT environment covering network architecture, remote access, device inventory, patch status, user access, and security monitoring. Conducted with your operations and engineering teams, not as an external audit that produces a report nobody acts on. Output is a prioritised list of findings with recommended actions, effort estimates, and a realistic improvement roadmap.
Network segmentation - designing and implementing the separation between OT and IT networks that is the single most effective security control for most industrial sites. Firewall configuration, VLAN design, DMZ architecture for controlled data sharing, and documentation of approved traffic flows. We implement segmentation in stages to avoid disrupting operations.
Remote access hardening - reviewing and redesigning remote access to OT systems. Multi-factor authentication, VPN configuration, jump server design, vendor access controls, session monitoring and logging. Remote access is the most common entry point for OT incidents and is frequently implemented without adequate controls.
Secure USB and portable media controls - practical controls for the engineering workflows that require removable media. Malware screening stations, policy for approved media, and alternatives to USB for common engineering tasks like firmware updates and configuration backups.
Patch management - developing a practical patch management approach for OT systems that accounts for vendor validation requirements, maintenance windows, and legacy systems that cannot be patched. Not all systems can be kept current - the process is about managing the risk of those that can’t.
Security monitoring - basic OT network monitoring for anomalous traffic and unauthorised connections. Passive monitoring that does not affect control system operation, with alerting configured for your environment and staff.
Vendor and contractor access controls - reviewing and tightening the access that external vendors and contractors have to your OT systems. Defining what access they need, when they have it, and how it is monitored and terminated.
OT domain architecture - design and implementation of Active Directory infrastructure for OT environments, including dedicated OT domain design, IT/OT/DMZ network segmentation, Windows Server deployment in industrial contexts, Group Policy configuration for OT workstations and servers, and OT domain migration methodology for sites moving from workgroup or flat-domain configurations to a structured OT domain architecture.
OT incident response - when an active cyber incident affects operational technology systems, the response priorities are different to an IT incident. Safe containment, controlled isolation, and recovery of control system function take precedence over forensic preservation. We assist with OT-specific incident response including asset documentation, endpoint security deployment, PLC and SCADA system recovery from verified backups, and post-incident security roadmap development.
OT domain architecture
Many industrial sites operate SCADA workstations, engineering laptops, and historian servers in workgroup configurations — no domain, no centralised authentication, shared local administrator accounts, and no Group Policy to enforce consistent security settings. This is common on sites where the OT environment grew incrementally and IT was not involved in the early infrastructure decisions.
A structured OT domain architecture addresses these problems without the risks that come from joining OT systems to the corporate IT domain. A dedicated OT Active Directory domain, separated from corporate IT by a DMZ with controlled firewall rules, provides centralised user authentication, Group Policy enforcement for OT workstations and servers, auditable access logs, and a clear boundary for vendor and contractor access.
We design and implement OT domain infrastructure for industrial sites including dedicated Windows Server deployment in OT environments, OT Active Directory domain design and build, Group Policy configuration appropriate to OT workstation constraints (controlled update policy, USB restrictions, screen lock, audit logging), firewall and DMZ architecture between IT and OT domains, and migration methodology for sites transitioning from workgroup or flat configurations. This work is often carried out in conjunction with network segmentation and remote access hardening as part of a broader OT security uplift.
Incident response experience
Beetle Engineering has provided OT cybersecurity incident response for a major Queensland industrial client following a cyber attack on their operational technology environment in 2026. Work included OT asset documentation, endpoint security deployment across the affected environment, recovery of PLC and SCADA systems from verified backups, and development of a post-incident cybersecurity remediation roadmap. Full details of the engagement are not publicly disclosed at the client’s request.
If you are dealing with an active OT security incident or suspect your control systems have been compromised, contact us directly. We respond to OT incidents as a priority.
Our approach
We approach OT security as engineers, not as pure security consultants. Controls need to work within the operational reality of an industrial facility - maintenance windows, production pressures, legacy systems, and engineering workflows that have evolved over years.
Recommendations are practical and prioritised by actual risk reduction, not theoretical worst-case scenarios. We implement what we recommend and work with your team to make sure controls are understood and maintainable after we leave.
Standards and frameworks
We work to ISA/IEC 62443 as the primary standard for industrial and OT cybersecurity. ISA/IEC 62443 is the internationally recognised standard for IACS (Industrial Automation and Control System) security, covering security management systems, risk assessment, system design, and component requirements. It is the framework most relevant to the environments we work in and the one most likely to be referenced by mining principal contractors, insurers, and government compliance requirements in the OT context.
We also reference the NIST Cybersecurity Framework 2.0 (NIST CSF 2.0) where required by client compliance obligations or where the organisation’s broader cybersecurity programme is structured around NIST. CSF 2.0 introduced a Govern function alongside the original Identify, Protect, Detect, Respond, and Recover functions - providing a more complete framework for organisations embedding cybersecurity into governance and risk management at an enterprise level.
For sites with specific principal contractor, insurer, or government security requirements, we assess against those requirements directly and map findings and recommendations to the applicable framework.