Iron Proxy Gateway for NanoClaw
nanocoai/nanoclaw
Installs or refreshes Iron Proxy and its Iron Control web console for NanoClaw, with a local Docker setup, database, credentials and a human approval bridge.
Detects DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length distributions, inspecting TXT record payloads, and identifying high subdomain cardinality.
Install Performing DNS Tunneling Detection
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill performing-dns-tunneling-detection -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills performing-dns-tunneling-detection --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/performing-dns-tunneling-detection .claude/skills/performing-dns-tunneling-detection && 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 "performing-dns-tunneling-detection" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/performing-dns-tunneling-detection into .claude/skills/performing-dns-tunneling-detection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performing-dns-tunneling-detection", 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/performing-dns-tunneling-detectionType 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 performing-dns-tunneling-detection -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills performing-dns-tunneling-detection --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/performing-dns-tunneling-detection .agents/skills/performing-dns-tunneling-detection && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "performing-dns-tunneling-detection" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/performing-dns-tunneling-detection into .agents/skills/performing-dns-tunneling-detection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performing-dns-tunneling-detection", 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 performing-dns-tunneling-detection -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills performing-dns-tunneling-detection --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/performing-dns-tunneling-detection .cursor/skills/performing-dns-tunneling-detection && 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 "performing-dns-tunneling-detection" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/performing-dns-tunneling-detection into .cursor/skills/performing-dns-tunneling-detection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performing-dns-tunneling-detection", 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/performing-dns-tunneling-detection--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 performing-dns-tunneling-detection -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills performing-dns-tunneling-detection --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/performing-dns-tunneling-detection .gemini/skills/performing-dns-tunneling-detection && 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 "performing-dns-tunneling-detection" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/performing-dns-tunneling-detection into .gemini/skills/performing-dns-tunneling-detection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performing-dns-tunneling-detection", 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 performing-dns-tunneling-detectionInstalls 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 performing-dns-tunneling-detection -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/performing-dns-tunneling-detection .github/skills/performing-dns-tunneling-detection && 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 "performing-dns-tunneling-detection" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/performing-dns-tunneling-detection into .github/skills/performing-dns-tunneling-detection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performing-dns-tunneling-detection", 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 performing-dns-tunneling-detection -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 performing-dns-tunneling-detection --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/performing-dns-tunneling-detection .opencode/skills/performing-dns-tunneling-detection && 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 "performing-dns-tunneling-detection" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/performing-dns-tunneling-detection into .opencode/skills/performing-dns-tunneling-detection/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "performing-dns-tunneling-detection", 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
performing-dns-tunneling-detection- GitHub stars
- 34k
- Token cost
- ~636 tokens
- SKILL.md length
- 137 words
- Files
- 4 (incl. scripts, references)
- Skills in repo
- 644
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Detects DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length distributions, inspecting TXT record payloads, and identifying high subdomain cardinality.
- Works in 5 steps: High Shannon entropy in query names (>… → Unusually long query names (> 50… → High volume of TXT record requests to a… → …
- Hunting for data exfiltration
- SKILL.md covers When to Use, Prerequisites, Instructions and Examples
- Runs Python scripts from its folder
What it does
Performing DNS Tunneling Detection is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detects DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length distributions, inspecting TXT record payloads, and identifying high subdomain cardinality. Uses scapy for packet capture analysis and statistical methods to distinguish legitimate DNS from covert channels. Use when hunting for data exfiltration.
Its SKILL.md is about 640 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 DevOps & Cloud. 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 data exfiltration
Example prompts
- “Use the performing-dns-tunneling-detection skill to detect DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length…”
- “/performing-dns-tunneling-detection”
Requirements
- Python 3
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- High Shannon entropy in query names (> 3.5 for subdomain labels)
- Unusually long query names (> 50 characters)
- High volume of TXT record requests to a single domain
- High unique subdomain count per parent domain
- Non-standard character distribution in labels
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
Performing DNS Tunneling Detection loads about 636 tokens when it runs, and up to ~1k if it reads all its reference files. Until then it costs about 94 tokens; SKILL.md has 137 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). 137 words, ~636 tokens.
Download SKILL.mdSave it as
.claude/skills/performing-dns-tunneling-detection/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- performing-dns-tunneling-detection
- description
- Detects DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length distributions, inspecting TXT record payloads, and identifying high subdomain cardinality. Uses scapy for packet capture analysis and statistical methods to distinguish legitimate DNS from covert channels. Use when hunting for data exfiltration.
- domain
- cybersecurity
- subdomain
- security-operations
- tags
- dns-tunneling, exfiltration-detection, shannon-entropy, dns-analysis, threat-detection, security-operations
- version
- 1.0
- author
- mahipal
- license
- Apache-2.0
- nist_csf
- DE.CM-01, RS.MA-01, GV.OV-01, DE.AE-02
- mitre_attack
- T1078, T1190, T1059, T1048, T1041
Performing DNS Tunneling Detection
When to Use
- When conducting security assessments that involve performing dns tunneling detection
- When following incident response procedures for related security events
- When performing scheduled security testing or auditing activities
- When validating security controls through hands-on testing
Prerequisites
- Familiarity with security operations 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
Instructions
Analyze DNS traffic for indicators of DNS tunneling using entropy analysis and statistical methods on query name characteristics.
import math
from collections import Counter
def shannon_entropy(data):
if not data:
return 0
counter = Counter(data)
length = len(data)
return -sum((c/length) * math.log2(c/length) for c in counter.values())
# Legitimate domain: low entropy (~3.0-3.5)
print(shannon_entropy("www.google.com"))
# DNS tunnel: high entropy (~4.0-5.0)
print(shannon_entropy("aGVsbG8gd29ybGQ.tunnel.example.com"))Key detection indicators:
- High Shannon entropy in query names (> 3.5 for subdomain labels)
- Unusually long query names (> 50 characters)
- High volume of TXT record requests to a single domain
- High unique subdomain count per parent domain
- Non-standard character distribution in labels
Examples
from scapy.all import rdpcap, DNS, DNSQR
packets = rdpcap("dns_traffic.pcap")
for pkt in packets:
if pkt.haslayer(DNSQR):
query = pkt[DNSQR].qname.decode()
entropy = shannon_entropy(query)
if entropy > 4.0:
print(f"Suspicious: {query} (entropy={entropy:.2f})")© 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/performing-dns-tunneling-detection 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
Performing DNS Tunneling Detection 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 |
|---|---|---|---|---|---|---|
| Performing DNS Tunneling Detection this skillmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~636 | Automated safety check: Pass | Apache-2.0 | |
| Iron Proxy Gateway for NanoClawnanocoai/nanoclaw | 31k | — | ~4.6k | Automated safety check: Notes | MIT | |
| GitHub Actions Supply Chain Pinningasyncapi/generator | 1.1k | — | ~1.9k | Automated safety check: Pass | Apache-2.0 | |
| AWS Cloud Advisortech-leads-club/agent-skills | 7k | — | ~2.1k | Automated safety check: Pass | CC-BY-4.0 | |
| KubeShark for KubernetesLukasNiessen/kubernetes-skill | 446 | — | ~1.2k | Automated safety check: Pass | MIT | |
| Migrate Dotnet9 To Dotnet10dotnet/skills | 5.6k | 2 repos | ~4.8k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Performing DNS Tunneling Detection
What does Performing DNS Tunneling Detection do?
Detects DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length distributions, inspecting TXT record payloads, and identifying high subdomain cardinality. Performing DNS Tunneling Detection is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Detects DNS tunneling by computing Shannon entropy of DNS query names, analyzing query length distributions, inspecting TXT record payloads, and identifying high subdomain cardinality.
When should I use Performing DNS Tunneling Detection?
Performing DNS Tunneling Detection fits situations like: hunting for data exfiltration.
How do I install Performing DNS Tunneling Detection in Claude Code?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill performing-dns-tunneling-detection -a claude-code`. Or copy the skill folder (skills/performing-dns-tunneling-detection in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/performing-dns-tunneling-detection in your project. Claude Code loads it when a task matches its description.
How do I install Performing DNS Tunneling Detection in Codex?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill performing-dns-tunneling-detection -a codex`. Or copy the skill folder (skills/performing-dns-tunneling-detection in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/performing-dns-tunneling-detection in your project. Codex loads it when a task matches its description.
Can I use Performing DNS Tunneling Detection 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 performing-dns-tunneling-detection -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/performing-dns-tunneling-detection, .gemini/skills/performing-dns-tunneling-detection, .github/skills/performing-dns-tunneling-detection and .opencode/skills/performing-dns-tunneling-detection in your project.
What does Performing DNS Tunneling Detection need to run?
Going by SKILL.md and its folder, Performing DNS Tunneling Detection needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Performing DNS Tunneling Detection 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 Performing DNS Tunneling Detection 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 Performing DNS Tunneling Detection use?
Performing DNS Tunneling Detection 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 Performing DNS Tunneling Detection use?
About 636 tokens (SKILL.md is roughly 2.5k 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 399 tokens, read only when the agent opens those files.
What are the alternatives to Performing DNS Tunneling Detection?
Skills that share tags, products or a category with Performing DNS Tunneling Detection: Iron Proxy Gateway for NanoClaw (nanocoai/nanoclaw, 31k stars), GitHub Actions Supply Chain Pinning (asyncapi/generator, 1.1k stars), AWS Cloud Advisor (tech-leads-club/agent-skills, 7k stars) and KubeShark for Kubernetes (LukasNiessen/kubernetes-skill, 446 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Performing DNS Tunneling Detection?
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.