Merlin (BETA)

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

An introductory blog post can be found here: https://medium.com/@Ne0nd0g/introducing-merlin-645da3c635a

Getting Started

The quickest and easiest way to start using Merlin is download the pre-compiled binary files found in the Releases section. The files are compressed into 7z archives and are password protected to prevent Anti-Virus inspection when downloading. The password is merlin.

Install GO

In order to run Merlin from source, or to compile Merlin yourself, the Go programing language must be installed on the system. However, if you just want to run a pre-compiled version, you do not need to install Go.

Download and install GO: https://golang.org/doc/install

Ensure your GOPATH environment variable is set

Running Merlin Server

Merlin Server can be run as a script or compiled and run as a standalone binary file.

It is recommended to download the compiled binaries from the Releases section

Run Merlin Server as a script:

git clone https://github.com/Ne0nd0g/merlin/

go run cmd/merlinserver/main.go

Compile Merlin Server into an executable:

make server-windows or make server-linux or make server-darwin

Merlin Server Usage

  -debug
        Enable debug output
  -i string
        The IP address of the interface to bind to (default "0.0.0.0")
  -p int
        Merlin Server Port (default 443)
  -v    Enable verbose output
  -x509cert string
        The x509 certificate for the HTTPS listener (default "C:\\Merlin\\data\\x509\\server.crt")
  -x509key string
        The x509 certificate key for the HTTPS listener (default "C:\\Merlin\\data\\x509\\server.key")

Merlin Server Commands

Merlin is equipped with a tab completion system that can be used to see what commands are available at any given time. Hit double tab to get a list of all available commands.

exit    Exit and close Merlin

help   Show Merlin help menu

quit    Exit and close Merlin

?      Show Merlin help menu

Agent Commands

These are the commands to control an agent from the server. Tab completion can be used to select an Agent's identifier.

agent cmd <agent id> <command>       A command to run on a remote agent

agent control <agent id> <command>  Configure/Control a remote agent (not the host)
                [kill,sleep,padding,maxretry]

agent info <agent id>               Display all information for an agent

agent list                          List agents

TLS Certificates

By default, Merlin will load server.crt and server.key from the data/x509/ directory. You must generate your own certificate pair and place them in this directory.

Third Party Libraries

The 3rd party libraries used with Merlin are kept in the vendor directory. This project will default to using the library files in that folder.

Running Merlin Agent

The agent portion of Merlin should be run as a compiled binary file on a target host.

It is recommended to download the compiled binaries from the Releases section

Ensure your GOPATH environment variable is set!

Compile Merlin Agent into an executable

make agent-windows or make agent-linux or make agent-darwin

Merlin Agent can also be compiled without Make, using just go. To compile Merlin Agent with your hard coded Merlin Server's address, so it doesn't have to specified on the command line, include -ldflags -X main.URL=https://acme.com:443/

Example: go build -o merlinagent.exe -ldflags "-X main.URL=https://acme.com:443/" cmd/merlinagent/main.go

Run Merlin Agent as script: go run cmd/merlinagent/main.go

USAGE

  -debug
        Enable debug output
  -sleep duration
        Time for agent to sleep (default 10s)
  -url string
        Full URL for agent to connect to (default "https://127.0.0.1:443")
  -v    Enable verbose output