Title: Application of cyber threat analysis framework in the decomposition of satellite ground segment functions
Abstract: This study investigates cybernetic vulnerabilities in ground segments of spatial systems. Global cyber attacks motivate this study. In Brazil, programs such as the Blue Amazon Management System (SisGAAz), the Integrated Border Monitoring System (SisFRON) and the Strategic Space Systems Program (PESE) require satellite communications and are susceptible to cyber attacks. The protection of these assets becomes essential. A systems engineering approach based on cyber threat analysis models and frameworks, including STRIDE, Cyber Kill Chain, MITRE ATT&CK and Cyber Attack Tree, guides this study. The methodology employs the decomposition of functions to operate a satellite solo segment, using the Arcadia methodology and the Capella software. The goal is to identify and evaluate attack surfaces. Qualitative analysis and virtual simulations reveal vulnerabilities of a solo segment. The study presents a framework that detects cyber threats, based on decomposed systemic functions. The research validates the hypothesis that integrating threat analysis frameworks to the modeling of spatial systems and the architecture of a virtual simulation allows to represent vulnerabilities in a systemic and tactical way. This work contributes to the cybersecurity of spatial systems, offering a tool to mitigate risks in a scenario of growing digitization and connectivity.