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Multicast communication of mobile ad hoc networks (MANET), rather than multiple unicast communication, delivers common content to more than one receiver at a time. Due to cutting-edge communication technology and advancements in terms of radio-mounted devices, groups in front-end war field, as well as rescue troops, are well connected to carry out their missions using multicast communication. The key to the success of military networks in a hostile environment is security and collaboration. Internal attacks are major threats to impose a great failure in their mission goal. We introduce a novel indirect internal stealthy attack and known direct internal stealthy attacks such as black hole and deny-to-forward attacks on tree-based multicast routing protocol. These internal attacks can induce the performance degradation in the multicast group. We design a distributed cross-layer based machine learning …