E-Health Telecommunication Systems and Networks, 2025, 14(4), 71-86 https://www.scirp.org/journal/etsn ISSN Online: 2167-9525 ISSN Print: 2167-9517 DOI: 10.4236/etsn.2025.144007 Oct. 24, 2025 71 E-Health Telecommunication Systems and Networks A4 AI-Guard: Advancing AI Defense for Cybersecurity in Healthcare Mostafa Rahmany Cybersecurity Researcher, Dubai, UAE Abstract Healthcare cyberattacks rise as attackers leverage system and human vulnera- bilities. The existing security systems are technology-driven as they focus on system resilience, but they neglect human errors, which are the weakest link for cybersecurity in healthcare. A4 AI-Guard is an artificial intelligence-pow- ered adaptive threat defense system which links AI systems to human security methods for the improvement of healthcare cybersecurity. The four adaptive pillars of the A4 AI-Guard system are, Adaptive Behavioral Risk Profiling for Adaptive Analysis, which monitors user activities to identify threats in ad- vance, and Active Threat Detection and Response, which applies AI for cyber threat identification and prevention in real time, and Augmented Role-Based Training, which provides continuous EHR training to healthcare workers ac- cording to their role, and lastly, Adaptive Cultural Reinforcement, which uses AI reproducibility knowledge to help healthcare organizations build and main- tain security culture. The value of A4 AI-Guard is validated by applying the sys- tem to two recent healthcare ransomware attacks, including Change Healthcare and Universal Health Services, to show how it would improve system availa- bility and response time and deal with human security vulnerabilities. The eval- uation metrics are threefold. First, the number of cyber incidents will be re- duced while the detection and response times will be reduced. Second, the em- ployee training completion rate will increase through more engagement and reasoning and exploration, and third, the organization will develop a stronger security culture through metrics and indicators. The results show that A4 AI- Guard is an adaptive defense system which provides both proactive protection and scalability as well as human understanding to help healthcare organizations protect themselves against complex, dynamic threats. The focus of the research is on A4 AI-Guard as an artificial intelligence cybersecurity framework which protects healthcare through ransomware defense, behavioral analytics and train- ing, and EHR and IoMT systems. Operationalization of Adaptive Cultural Re- How to cite this paper: Rahmany, M. (2025) A4 AI-Guard: Advancing AI Defense for Cybersecurity in Healthcare. E-Health Tele- communication Systems and Networks, 14, 71-86. https://doi.org/10.4236/etsn.2025.144007 Received: September 12, 2025 Accepted: October 21, 2025 Published: October 24, 2025 Copyright © 2025 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access