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FRP, which stands for Fast Reverse Proxy, is an openly available tool that is capable of exposing a server located behind a firewall or Network Address Translation (NAT) to the Internet. FRP can support multiple protocols including TCP, UDP, and HTTP(S) and has been abused by threat actors to proxy command and control communications.(Citation: FRP GitHub)(Citation: Joint Cybersecurity Advisory Volt Typhoon June 2023)(Citation: RedCanary Mockingbird May 2020)(Citation: DFIR Phosphorus November 2021)