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Critical infrastructures are the backbone of everyday life and their protection from cyber-threats is an increasingly pressing issue for governments and private industries. Not only is effective security costly, the requirements individual critical infrastructures have been often unique, meaning their security systems have to be tailored to match their specific needs. As a result of these factors, simulation can play a key role in the advancement of security measures in a cheap, safe and effective way. In this paper, the development of a distributed support system is presented. The system employs behaviour analysis techniques to support interconnected infrastructures and distribute security advice throughout an interdependent system of systems. The approach is tested through the simulation, which is used to build realistic data from 8 critical infrastructures. The research is inspired by the human immune characteristics.