What is JustC2

Sat, 19 Sep 2026 00:00:00 +0000

Based on AdaptixC2

JustC2 is based on AdaptixC2, an open-source C2 framework created by RalfHacker.

Architecture

Sat, 19 Sep 2026 00:00:00 +0000

High-Level Architecture

JustC2 follows a classic C2 architecture with three tiers:

┌─────────────┐ HTTPS/WSS ┌──────────────┐ HTTP/TCP/SMB/DNS ┌─────────────┐
│ JustClient │ ◄──────────────────► │ JustServer │ ◄────────────────────► │ Agents │
│ (Operator) │ WebSocket + REST │ (Teamserver) │ Listener Protocols │ (Targets) │
└─────────────┘ └──────────────┘ └─────────────┘
 │
 ┌─────┴─────┐
 │ Extenders │
 │ (.so) │
 └───────────┘

Component Responsibilities

Component	Language	Role
JustServer	Go	Central teamserver — manages agents, listeners, tasks, and operator connections
JustClient	C++ (Qt6)	Desktop GUI for operators to interact with the teamserver
Extenders	Go (.so)	Plugin modules that implement listener and agent logic
axc2	Go	Shared type definitions used by the server and extenders

JustServer

The teamserver is the central hub. It exposes a REST API and WebSocket endpoint over TLS for operator connections, and manages listener processes that communicate with deployed agents.

Introduction on JustC2 Docs

What is JustC2

Architecture

High-Level Architecture

Component Responsibilities

JustServer