Authorization Bypass Detection
Tencent/AI-Infra-Guard
Probes an AI agent through dialogue for cross-user data access, privilege escalation and login bypass, and reports confirmed findings as structured vulnerability entries.
Agent skill
Hunting For Domain Fronting C2 Traffic
Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL.
Install Hunting For Domain Fronting C2 Traffic
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-domain-fronting-c2-traffic --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/hunting-for-domain-fronting-c2-traffic .claude/skills/hunting-for-domain-fronting-c2-traffic && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "hunting-for-domain-fronting-c2-traffic" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-traffic into .claude/skills/hunting-for-domain-fronting-c2-traffic/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-domain-fronting-c2-traffic", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-trafficType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-domain-fronting-c2-traffic --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/hunting-for-domain-fronting-c2-traffic .agents/skills/hunting-for-domain-fronting-c2-traffic && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "hunting-for-domain-fronting-c2-traffic" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-traffic into .agents/skills/hunting-for-domain-fronting-c2-traffic/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-domain-fronting-c2-traffic", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-domain-fronting-c2-traffic --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/hunting-for-domain-fronting-c2-traffic .cursor/skills/hunting-for-domain-fronting-c2-traffic && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "hunting-for-domain-fronting-c2-traffic" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-traffic into .cursor/skills/hunting-for-domain-fronting-c2-traffic/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-domain-fronting-c2-traffic", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git --path skills/hunting-for-domain-fronting-c2-traffic--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-domain-fronting-c2-traffic --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/hunting-for-domain-fronting-c2-traffic .gemini/skills/hunting-for-domain-fronting-c2-traffic && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "hunting-for-domain-fronting-c2-traffic" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-traffic into .gemini/skills/hunting-for-domain-fronting-c2-traffic/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-domain-fronting-c2-traffic", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-domain-fronting-c2-trafficInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/hunting-for-domain-fronting-c2-traffic .github/skills/hunting-for-domain-fronting-c2-traffic && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "hunting-for-domain-fronting-c2-traffic" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-traffic into .github/skills/hunting-for-domain-fronting-c2-traffic/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-domain-fronting-c2-traffic", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills hunting-for-domain-fronting-c2-traffic --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/hunting-for-domain-fronting-c2-traffic .opencode/skills/hunting-for-domain-fronting-c2-traffic && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "hunting-for-domain-fronting-c2-traffic" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/hunting-for-domain-fronting-c2-traffic into .opencode/skills/hunting-for-domain-fronting-c2-traffic/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "hunting-for-domain-fronting-c2-traffic", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
hunting-for-domain-fronting-c2-traffic- GitHub stars
- 34k
- Token cost
- ~695 tokens
- SKILL.md length
- 267 words
- Files
- 4 (incl. scripts, references)
- Skills in repo
- 644
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL.
- Works in 7 steps: Parse proxy logs for connections with… → Compare SNI domain against HTTP Host… → Extract TLS certificate Subject and SAN… → …
- Hunting for command-and-control traffic hidden behind legitimate CDN domains
- SKILL.md covers Overview, When to Use, Prerequisites and Steps, plus 1 more section
- Runs Python scripts from its folder
What it does
Hunting For Domain Fronting C2 Traffic is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL. Use when hunting for command-and-control traffic hidden behind legitimate CDN domains, or when investigating proxy/TLS logs for signs of domain fronting evasion.
Its SKILL.md is about 700 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `references/api-reference.md` and `scripts/agent.py`).
It sits in Security, covering Red teaming and adversary simulation and Cloud networking. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.
When your agent uses it
- Hunting for command-and-control traffic hidden behind legitimate CDN domains
- Investigating proxy/TLS logs for signs of domain fronting evasion
Example prompts
- “Use the hunting-for-domain-fronting-c2-traffic skill to detect domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy…”
- “/hunting-for-domain-fronting-c2-traffic”
Requirements
- Python 3
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Parse proxy logs for connections with both SNI and Host header fields
- Compare SNI domain against HTTP Host header for mismatches
- Extract TLS certificate Subject and SAN fields using pyOpenSSL
- Identify CDN-hosted connections via certificate issuer and IP ranges
- Flag high-confidence domain fronting where SNI and Host differ on CDN IPs
- Score alerts based on domain reputation differential
- Generate detection report with network flow context
What it can do on your machine
Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Hunting For Domain Fronting C2 Traffic loads about 695 tokens when it runs, and up to ~1.2k if it reads all its reference files. Until then it costs about 90 tokens; SKILL.md has 267 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 267 words, ~695 tokens.
Download SKILL.mdSave it as
.claude/skills/hunting-for-domain-fronting-c2-traffic/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- hunting-for-domain-fronting-c2-traffic
- description
- Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL. Use when hunting for command-and-control traffic hidden behind legitimate CDN domains, or when investigating proxy/TLS logs for signs of domain fronting evasion.
- domain
- cybersecurity
- subdomain
- threat-hunting
- tags
- domain-fronting, c2-detection, tls-inspection, proxy-logs, pyopenssl, threat-hunting, network-security
- version
- 1.0
- author
- mahipal
- license
- Apache-2.0
- d3fend_techniques
- Application Protocol Command Analysis, Network Isolation, Network Traffic Analysis, Client-server Payload Profiling, Network Traffic Community Deviation
- nist_csf
- DE.CM-01, DE.AE-02, DE.AE-07, ID.RA-05
- mitre_attack
- T1046, T1057, T1082, T1083, T1071
Hunting for Domain Fronting C2 Traffic
Overview
Domain fronting (MITRE ATT&CK T1090.004) is a technique where attackers use different domain names in the TLS SNI field and the HTTP Host header to disguise C2 traffic behind legitimate CDN-hosted domains. This skill detects domain fronting by parsing proxy/web gateway logs for SNI-Host header mismatches, analyzing TLS certificates for CDN provider identification, flagging connections where the SNI points to a high-reputation domain but the Host header targets an attacker-controlled domain, and correlating with known CDN provider IP ranges.
When to Use
- When investigating security incidents that require hunting for domain fronting c2 traffic
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Web proxy or secure web gateway logs with SNI and Host header fields
- Python 3.8+ with pyOpenSSL and cryptography libraries
- TLS inspection enabled on proxy for Host header visibility
- CDN provider IP range lists (CloudFront, Azure CDN, Cloudflare)
Steps
- Parse proxy logs for connections with both SNI and Host header fields
- Compare SNI domain against HTTP Host header for mismatches
- Extract TLS certificate Subject and SAN fields using pyOpenSSL
- Identify CDN-hosted connections via certificate issuer and IP ranges
- Flag high-confidence domain fronting where SNI and Host differ on CDN IPs
- Score alerts based on domain reputation differential
- Generate detection report with network flow context
Expected Output
JSON report containing detected domain fronting indicators with SNI-Host pairs, certificate details, CDN provider identification, confidence scores, and MITRE ATT&CK technique mapping.
© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 3 other files (scripts, references) in skills/hunting-for-domain-fronting-c2-traffic of mukul975/Anthropic-Cybersecurity-Skills.
- SKILL.md
- LICENSE
- references/api-reference.md
- scripts/agent.py
Open the folder on GitHubat commit 54a7988
Compare with similar skills
Hunting For Domain Fronting C2 Traffic next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Hunting For Domain Fronting C2 Traffic this skillmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~695 | Automated safety check: Pass | Apache-2.0 | |
| Authorization Bypass DetectionTencent/AI-Infra-Guard | 6.8k | — | ~753 | Automated safety check: Pass | Apache-2.0 | |
| Run Assert Evalresponsibleai/ASSERT | 330 | — | ~11k | Automated safety check: Notes | MIT | |
| Osint Methodologyelementalsouls/Claude-OSINT | 2.8k | — | ~8.7k | Automated safety check: Notes | MIT | |
| Lfd Designelvisun/loss-function-development | 176 | — | ~2.9k | Automated safety check: Notes | MIT | |
| Acl AbuseADScanPro/Claude-AD | 211 | — | ~2.6k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Hunting For Domain Fronting C2 Traffic
What does Hunting For Domain Fronting C2 Traffic do?
Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL. Hunting For Domain Fronting C2 Traffic is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL.
When should I use Hunting For Domain Fronting C2 Traffic?
Hunting For Domain Fronting C2 Traffic fits situations like: hunting for command-and-control traffic hidden behind legitimate CDN domains; investigating proxy/TLS logs for signs of domain fronting evasion.
How do I install Hunting For Domain Fronting C2 Traffic in Claude Code?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a claude-code`. Or copy the skill folder (skills/hunting-for-domain-fronting-c2-traffic in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/hunting-for-domain-fronting-c2-traffic in your project. Claude Code loads it when a task matches its description.
How do I install Hunting For Domain Fronting C2 Traffic in Codex?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a codex`. Or copy the skill folder (skills/hunting-for-domain-fronting-c2-traffic in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/hunting-for-domain-fronting-c2-traffic in your project. Codex loads it when a task matches its description.
Can I use Hunting For Domain Fronting C2 Traffic in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/hunting-for-domain-fronting-c2-traffic, .gemini/skills/hunting-for-domain-fronting-c2-traffic, .github/skills/hunting-for-domain-fronting-c2-traffic and .opencode/skills/hunting-for-domain-fronting-c2-traffic in your project.
What does Hunting For Domain Fronting C2 Traffic need to run?
Going by SKILL.md and its folder, Hunting For Domain Fronting C2 Traffic needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Hunting For Domain Fronting C2 Traffic access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Hunting For Domain Fronting C2 Traffic safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Hunting For Domain Fronting C2 Traffic use?
Hunting For Domain Fronting C2 Traffic is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Hunting For Domain Fronting C2 Traffic use?
About 695 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 530 tokens, read only when the agent opens those files.
What are the alternatives to Hunting For Domain Fronting C2 Traffic?
Skills that share tags, products or a category with Hunting For Domain Fronting C2 Traffic: Authorization Bypass Detection (Tencent/AI-Infra-Guard, 6.8k stars), Run Assert Eval (responsibleai/ASSERT, 330 stars), Osint Methodology (elementalsouls/Claude-OSINT, 2.8k stars) and Lfd Design (elvisun/loss-function-development, 176 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Hunting For Domain Fronting C2 Traffic?
mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.
Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.