Modernizing OT Security: How Frenos Uses Digital Twin Technology, AI and Threat Emulation to Transform Security Posture and Compliance

The Modernizing OT Security: How Frenos Uses Digital Twin Technology, AI, and Threat Emulation to Transform Security Posture and Compliance review, published by SANS Institute in October 2025, examines how the Frenos platform uses digital twin technology to perform vulnerability assessments, attack path analysis, and threat emulation for industrial control system (ICS) environments without the operational risk of testing against live production systems.

Key findings:

• Frenos operates as an on-premises, Linux-embedded cluster designed specifically for regulated and isolated ICS networks, with authentication configurable via local accounts or OIDC
• The platform maps to compliance controls across four major frameworks: NERC CIP (CIP-010-4), NIST CSF 2.0, TSA Pipeline Security Directives, and NIS2 (per Appendix A's control mapping table)
• Frenos integrates with major ICS security vendors across four categories (segmentation, visibility, vulnerabilities, endpoint), including Fortinet, Cisco, Dragos, Claroty, Nozomi, and Tenable
• Of the standards and regulations impacting critical infrastructure covered in the review, the TSA Pipeline Security Directives are the only ones that explicitly suggest red team exploitation and purple team virtual exercises
• The platform's "Digital Twin" model provides four data perspectives: Assets View, Network View, Network Devices View, and Vulnerabilities View, each with a distinct set of tracked fields
• In a case study, a large electric utility used Frenos Threat Campaign simulation to focus threat hunting activities on a vulnerable VPN appliance and email server by predicting how an adversary would gain access to those devices
• NERC CIP-010-4 Requirement 3.1 requires a paper-based or active vulnerability assessment every 15 calendar months, while Requirement 3.2.1 requires an active assessment every 36 calendar months
• The platform's attack path analysis correlates network segmentation, routing, rules, open services, ports, and known vulnerabilities to identify probable paths between an assumed attacker posture and a specific "crown jewel" target

The review's central argument is that traditional vulnerability scanning and penetration testing in ICS environments carries meaningful operational risk to production systems, and that Frenos's digital twin approach lets asset owners perform these assessments against a representative model instead, reducing the scheduling and restoration burden that has historically made red team and purple team exercises difficult to complete in OT settings. The authors position this as directly relevant to compliance documentation requirements (such as NERC CIP-010-4 R3.2.2's requirement to document differences between a test environment and the CIP-applicable production environment it represents) rather than as a replacement for regulatory judgment. This is a SANS product review rather than primary survey research, authored by Tim Conway and Jason Dely and drawing on the Frenos platform's documented capabilities, named regulatory frameworks, and a single named case study (a large electric utility).