Nimplant is a cross-platform (Linux & Windows) implant written in Nim as a fun project to learn about Nim and see what it can bring to the table for red team tool development. Currently, Nimplant lacks extensive evasive tradecraft; however, overtime Nimplant will become much more sophisticated.
To install Nimplant, you’ll need Mythic installed on a remote computer. You can find installation instructions for Mythic at the Mythic project page.
From the Mythic install root, run the command:
./install_agent_from_github.sh https://github.com/MythicAgents/Nimplant
Once installed, restart Mythic to build a new agent.
Commands Manual Quick Reference
| Command | Syntax | Description |
|---|---|---|
| cat | cat [file] | Retrieve the output of a file. |
| cd | cd [dir] | Change working directory. |
| cp | cp [source] [destination] | Copy a file from source to destination. Modal popup. |
| curl | curl [url] [method] [headers] [body] | Execute a single web request. |
| download | download [path] | Download a file off the target system. |
| exit | exit | Exit a callback. |
| getenv | getenv | Get all of the current environment variables. |
| jobs | jobs | List all running jobs. |
| kill | kill [pid] | Attempt to kill the process specified by [pid]. |
| ls | ls [path] [recurse] | List files and folders in [path] with optional param to list recursively. Defaults to current working directory. |
| mkdir | mkdir [dir] | Create a directory. |
| mv | mv [source] [destination] | Move a file from source to destination. Modal popup. |
| ps | ps | List process information. |
| pwd | pwd | Print working directory. |
| rm | rm [path] | Remove a file specified by [path] |
| shell | shell [command] | Run a shell command which will translate to a process being spawned with command line: cmd.exe /r[command] |
| unsetenv | setenv [envname] [value] | Sets an environment variable to your choosing. |
| sleep | sleep [seconds] | Set the callback interval of the agent in seconds. |
| unsetenv | unsetenv [envname] | Unset an environment variable. |
| upload | upload | Upload a file to a remote path on the machine. Modal popup. |
Currently, only one C2 profile is available to use when creating a new Nimplant agent: HTTP.
The HTTP profile calls back to the Mythic server over the basic, non-dynamic profile. When selecting options to be stamped into Nimplant at compile time, all options are respected with the exception of those parameters relating to GET requests.
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