Operational Technology (OT) encompasses the hardware and software used to monitor, control, and automate industrial processes. Unlike traditional IT, which focuses primarily on data processing, OT controls physical processes and machinery in real time. These systems were traditionally isolated (“air-gapped”) but are increasingly connected to IT networks and the internet to enable efficiency and remote monitoring.
However, this convergence of IT and OT introduces significant security risks:
- Legacy systems: Many OT components were developed without any security considerations.
- Lack of updates: Critical systems often cannot be patched easily without risking operational disruption.
- Insufficient segmentation: Poor network separation between IT and OT environments.
- Weak authentication: Default passwords and missing two-factor authentication remain common.
The Threat Landscape in Switzerland
As a highly industrialized nation, Switzerland is a particularly attractive target for cyberattacks on critical infrastructure. The National Cyber Security Centre (NCSC) reports a steady increase in attacks targeting OT systems. Of particular concern are the following trends:
Ransomware Attacks on Industrial Facilities
Ransomware groups have identified OT systems as lucrative targets. A successful attack on a production plant can result in days of downtime and cause multimillion-franc losses. Several Swiss industrial companies have already been affected, with ransom demands reaching millions.
State-Sponsored Activities
Advanced Persistent Threat (APT) groups target strategically important infrastructures. These highly sophisticated attacks can remain undetected for years, serving purposes of espionage or preparation for sabotage.
Supply Chain Attacks
Attackers increasingly use trusted suppliers as entry points into OT networks. Compromised software updates or hardware components can have far-reaching consequences.
Penetration Testing for OT Systems
Penetration testing is one of the most effective methods to identify vulnerabilities in OT environments before attackers can exploit them. However, penetration testing in OT differs substantially from traditional IT pentesting.
Specific Challenges in OT Penetration Testing
- Safety before availability: In IT, uptime often takes precedence. In OT, however, the safety of physical processes is paramount. A failed penetration test can cause production outages or even pose physical safety risks to employees.
- Legacy systems and protocols: Many OT environments still use decades-old systems and industrial protocols such as Modbus, DNP3, or Profinet—originally designed without any security mechanisms.
- Specialized expertise: OT penetration testers require deep understanding of industrial processes, SCADA systems, and PLC programming.
Methodology of OT Penetration Testing
- Asset Discovery and Network Mapping
- Identification of all OT components
- Network topology analysis
- Protocol analysis (Modbus, DNP3, etc.)
- Vulnerability Assessment
- OT-specific vulnerability scanning
- Firmware analysis
- Configuration review
- Controlled Exploitation
- Careful exploitation of identified weaknesses
- Simulation of attacks without disrupting operations
- Documentation of observed effects
- Reporting and Recommendations
- Prioritized list of vulnerabilities
- Concrete remediation measures
- Emergency plans and incident response guidance
Legal Framework in Switzerland
Switzerland has significantly strengthened its cybersecurity legislation in recent years. The following are particularly relevant for OT security:
- New Federal Data Protection Act (nFADP): In effect since September 2023, the nFADP imposes stricter requirements for protecting personal data. OT systems processing employee data must implement appropriate security measures.
- Critical Infrastructure Protection Ordinance: Operators of critical infrastructure must implement adequate cybersecurity measures and report security incidents. This includes OT systems in sectors such as energy, transport, and other strategic industries.
- Sector-Specific Regulations:
- Energy sector: Electricity Supply Act (StromVG) and Energy Act (EnG) require cybersecurity measures.
- Financial sector: FINMA circulars mandate controls for managing cyber risks.
- Healthcare: The Medical Devices Ordinance includes cybersecurity requirements.
Best Practices for OT Cybersecurity
- Network Segmentation Strict separation of IT and OT networks using firewalls and DMZs is essential. Industrial Demilitarized Zones (IDMZ) enable controlled data exchange between both areas.
- Zero Trust Architecture The principle of “Never trust, always verify” is increasingly applied in OT environments. Every access must be authenticated and authorized, regardless of network location.
- Continuous Monitoring SIEM systems designed for OT environments can detect abnormal activities in real time. Anomaly detection and behavioral analysis play key roles in this.
- Incident Response Planning OT-specific emergency response plans must consider both cybersecurity and the safety of physical processes.
Conclusion: The Future of OT Cybersecurity in Switzerland
The increasing interconnection of industrial systems makes OT cybersecurity one of the most critical challenges for Swiss enterprises. Penetration testing plays a key role in proactively identifying and mitigating vulnerabilities.
Companies should adopt a holistic approach that integrates technical controls, organizational processes, and employee training. Collaboration with specialized OT cybersecurity experts is becoming ever more crucial to effectively counter rising threats.
Investing in OT cybersecurity is not merely a matter of compliance—it is essential for maintaining competitiveness and protecting critical infrastructure in Switzerland’s digital economy.