Challenge. A tier-1 automotive manufacturer operating multiple EU plants needed full visibility across robotic cells, PLCs and MES systems without disrupting just-in-time production.

Approach. Deployed GridHound for passive asset discovery, RF mapping and automated OT validation across three production halls. Integrated Device Heritage to assess controller and HMI supply-chain risk against NIS2 requirements.

Challenge. An upstream operator running pumping stations and a midstream terminal across the Caucasus needed an OT security baseline for SCADA, safety systems and remote wellhead telemetry under harsh operating conditions.

Approach. Combined on-site GridHound deployment with RF survey across distributed pads. Technical Consulting team produced a full IEC 62443 gap analysis and SIS isolation review with the operator's reliability engineers.

Challenge. A large integrated resort operator in Singapore needed to bring building management, gaming floor systems, guest IoT and back-of-house OT under a single security and compliance umbrella across multiple properties.

Approach. Rolled out GridHound across BMS, fire & life safety, kitchen automation and AV networks. Device Heritage applied to in-room IoT and gaming peripherals to validate suppliers against MAS and gaming regulator expectations.

Challenge. A national transmission system operator required continuous OT visibility and adversary-aware testing across high-voltage substations under NIS2 and ENISA guidance.

Approach. GridHound deployed in passive mode across substation LANs and process bus segments. Big Four Security threat research team executed scenario-based validation of IEC 61850 and engineering workstation paths.

Challenge. A US metropolitan transit authority needed visibility into rail signaling, depot SCADA, traction power and station systems following TSA Security Directives for surface transportation.

Approach. Combined GridHound discovery in depots and signaling rooms with RF mapping along platforms. Device Heritage profiled signaling controllers and CCTV supply chain. Technical Consulting drafted the TSA-aligned cybersecurity implementation plan.

Challenge. Investment funds, VCs and strategic acquirers needed an independent technical view of a target company's product or solution before committing capital — covering whether the technology is genuinely state-of-the-art, defensible and aligned with the claimed market narrative.

Approach. Big Four Security delivered a structured technical due diligence engagement: deep architecture and code-level review, security and IP posture analysis, ecosystem and competitive positioning, and an assessment of the founding team's expertise, key human capital and engineering culture — distilled into investment-ready findings.

Challenge. A healthcare provider was hit by an active cyber and technical breach impacting clinical and back-office systems. Leadership needed far more than DFIR — they needed a full crisis management partner running the response end to end: technical, operational, executive, legal, regulatory and communications, all in parallel and under pressure.

Approach. Big Four Security led the engagement as end-to-end crisis managers — not just a forensics or DFIR vendor. We ran the war room alongside the executive team, owning decision tempo, prioritization and external coordination. Workstreams under our management included: technical assessment and forensic triage, damage control across IT and connected medical systems, immediate containment fixes, multi-channel communication management with staff, patients, regulators, partners and media, direct handling of threat-actor negotiations, and the mid- and long-term recovery and resilience plan. We also produced the full paperwork for insurance, governance and compliance processes.