Network Protocol Reverse Engineering (NPRE) has played an increasing role in honeypot operations. It allows to automatically generate Statemodels and scripts being able to act as realistic counterpart for capturing unknown malware. This work proposes a novel approach in the field of NPRE. By passively listening to network traces, our system automatically derives the protocol state machines of the peers involved allowing the analyst to understand its intrinsic logic. We present a new methodology to extract the relevant fields from arbitrary binary protocols to construct a statemodel. We prove our methodology by deriving the statemachine of documented protocols ARP, DHCP and TCP. We then apply it to Kademlia, the results show the usefulness to support binary reverse engineering processes and detect a new undocumented feature.

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