[FRP](https://attack.mitre.org/software/S1144), 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](https://attack.mitre.org/software/S1144) 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)