Individual skill

c2-domain-fronting

Domain fronting and CDN abuse for C2 concealment — CloudFront, Azure CDN, Fastly setup, TLS SNI vs Host header technique, CDN-based redirectors, and integration with Cobalt Strike and Sliver.

packages/decepticon/decepticon/skills/standard/post-exploit/c2-domain-fronting/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 6,569
Repository last updated: Nov 7, 2026
License: Apache-2.0

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SKILL.mdcore · 17,788 bytes
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SKILL.mdcore · 17,788 bytes
SKILL.mdcore · 17,788 bytes
SKILL.mdcore · 17,788 bytes
SKILL.mdcore · 17,788 bytes
SKILL.mdcore · 17,788 bytes
SKILL.mdcore · 17,788 bytes
SKILL.mdcore · 17,788 bytes

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# Domain Fronting & CDN Abuse for C2

Domain fronting exploits the discrepancy between the TLS SNI field and the HTTP Host header when traffic passes through a CDN. The network-level observer sees a connection to a legitimate, high-reputation domain (e.g., `cdn.microsoft.com`) while the CDN routes the request to the operator's origin based on the inner Host header. This makes blocking the C2 equivalent to blocking the entire CDN.

## Quick Reference

```bash
# Test domain fronting via CloudFront
curl -s -H "Host: <C2_DISTRIBUTION>.cloudfront.net" https://allowed.cloudfront.net/search

# Test Azure CDN fronting
curl -s -H "Host: <C2_ENDPOINT>.azureedge.net" https://ajax.aspnetcdn.com/test

# Sliver HTTPS listener with domain fronting