Abstract--We present an analytical model combining geometric and stochastic approaches to describe the effects of attacks and countermeasures on MANETs. In particular, we focus on the packet loss that can be charged to the misbehavior as well as to the countermeasures as a primary metric. For this, we model the entire chain of (1) MANET routing, (2) attack, (3) intrusion detection, and (4) intrusion response. We validate the models proposed by means of simulation.