DeimosC2

Deimos is in: DEPRECATED

DeimosC2 is no longer maintained and has a known XSS vulnerability (CVE-2025-26244).

Thanks to JaRm222 for identifying the vuln and notifying us. His writeup of the vuln can be found here.

DeimosC2 is a post-exploitation Command & Control (C2) tool that leverages multiple communication methods in order to control machines that have been compromised. DeimosC2 server and agents works on, and has been tested on, Windows, Darwin, and Linux. It is entirely written in Golang with a front end written in Vue.js.

Listener Features

• Each listener has it's own RSA Pub and Private key that is leveraged to wrap encrypted agent communications.
• Dynamically generate agents on the fly
• Graphical map of listener and agents that are tied to it

Agent Features

• Agent list page to give high level overview
• Agent interaction page containing info of agent, ability to run jobs against agent, filebrowser, loot data, and ability to add comments

Supported Agents

• TCP
• HTTPS
• DoH (DNS over HTTPS)
• QUIC
• Pivot over TCP

Frontend Features

• Multi-User support with roles of admin and user
• Graphs and visual interaction with listeners and agents
• Password length requirements
• 2FA Authentication using Google MFA
• Websocket API Calls

Getting Started and Help

You can download the latest release and view the wiki for any assistance getting started or running the C2.

Submitting Issues

We welcome issues to be opened to help improve this project and keep it going. For bugs please use the template.

Authors

• Chase Dardaman (@CharlesDardaman)
• Quentin Rhoads-Herrera (@paragonsec)
• Elvira Sheina (developeruz)
• Blase Brignac (@BlaiseBrignac)

Credits

In order to develop this we used some of the awesome work of others. Below is a list of those we either used their code or were inspired by. If we missed you please let us know so we can add your name!

• lsassy by @HackAndDo used for some Windows modules
• goDoH by @leonjza from SensePost used for DoH
• BishopFox Sliver used in some places as they already did a fanstastic job
• Merlin used for reflective DLLs support
• dgoogauth used for the 2FA functionality
• gobfuscate used to support agent obfuscation
• Stack Overflow because isn't this how we develop now?
• Bad Sector Labs for their Domain Hiding technique using TLS 1.3, ESNI, and Cloudflare

Disclaimer

This program should only be used on environments that you own or have explicit permission to do so. Neither the authors, nor Critical Start, Inc., will be held liable for any illegal use of this program.