#52 · Primary category: Cybersecurity & Decryption Tools

merlin

agent c2 command-and-control golang http2 post-exploitation

Merlin is a cross-platform post-exploitation HTTP/2 Command & Control server and agent written in golang.

Project last updated:04/17/25

GitHub Stars

5.6K

Forks

838

Contributors

18

License

GPL-3.0

Why we included this project

Merlin is a solid pick for red teams and penetration testers who want a cross-platform command-and-control channel. The Go server and its matching agent can talk HTTP/1.1, HTTP/2, or HTTP/3, so operators choose the transport that fits the target environment instead of being locked into one protocol. The agent can also form peer-to-peer links over SMB, TCP, and UDP, which helps when moving laterally through segmented networks. After you get a foothold, it can execute .NET assemblies in-process or in a sacrificial process, run Windows executables, and use several shellcode injection techniques. Configurable message padding, encryption transforms, and JA3 fingerprint changes make the traffic harder to spot, and the gRPC-based CLI lets multiple users drive the same server. Teams already on the Mythic framework can run Merlin as an agent inside it.

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