Solutions for the operational edge.
From automated OT validation to device heritage intelligence and investment due diligence — Big Four Security brings security and intelligence to where it actually runs.
GridHound
Internal OT cybersecurity management platform — automated penetration testing, asset discovery, findings, remediation and a marketplace of OT add-ons. Works with existing infrastructure; sensors deploy statically or dynamically (humans, robots, drones, vehicles).
- Asset discovery & policy validation
- RF awareness & facility mapping
- Automated testing without disruption
- Unknown device detection
- Continuous posture monitoring
- Operational visibility dashboards
Device Heritage
Insights into device origin. Full visibility into components, suppliers, firmware and signals — at enterprise scale. A trusted heritage map for supply-chain risk, regulatory readiness and confident decisions about the devices you depend on.
- Component intelligence — hardware, firmware & supplier evidence
- AI-enabled, multi-layered origin & lineage analysis
- RF, signal collection & passive device fingerprinting
- Firmware analysis & symbolic execution
- Supply-chain risk across IoT, OT, avionics, medical & industrial
- Regulatory readiness & procurement decision support
Technical Consulting
Senior practitioners delivering OT security architecture, red teaming, product security and resilience strategy.
- OT security architecture
- Product security
- Red teaming
- Industrial assessments
- Infrastructure resilience
- AI / security integration
Cyber Financial Services
Cyber risk evaluation and technical due diligence for investors, acquirers and corporate development teams.
- Cyber risk evaluation
- Technical due diligence
- Investment security assessments
- Acquisition security reviews
- Operational cyber maturity analysis
Office Building Management System — securing a unique BMS environment.
A client-problem-focused engagement for a multi-tenant office complex in Israel with a non-standard set of operational, regulatory and tenant-driven requirements.
The challenge
The client operates a high-profile office building where the Building Management System controls HVAC, elevators, access control, lighting and energy metering across multiple tenants. They required full cyber visibility and validation without service interruption, alignment with local regulatory expectations and tenant-level isolation between shared OT segments.
What we delivered
- Passive asset discovery across BMS, HVAC, access and elevator networks
- Tenant-aware segmentation review and OT/IT boundary hardening
- Automated, non-disruptive penetration testing of controllers and gateways
- RF and wireless awareness across shared infrastructure floors
- Regulatory-aligned reporting for facility owner and tenants
- Continuous posture monitoring handed over to the operations team
The client gained a complete inventory of BMS assets, validated segmentation between tenants and a continuous monitoring posture — without a single interruption to building services.
Know the origin before you trust the device.
Hardware products are assembled from many suppliers, regions, chips, modules, firmware versions and hidden dependencies — creating complexity that is difficult to see, document and trust without a structured heritage view.
Device Heritage combines partner data, trusted public sources and our own state-of-the-art evidence collection — connecting hardware, firmware, component-level and supplier evidence into a single visual map of device origin, dependencies and risk.