analyzing-dns-logs-for-exfiltration SKILL.md skillA
This file is byte-identical to the first copy the registry indexed, one of 3 indexed copies. Same content hash, so the same checks give both the same grade.
analyzing-dns-logs-for-exfiltration from 26zl/cybersec-toolkit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add 26zl/cybersec-toolkit/analyzing-dns-logs-for-exfiltration@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- 26zl/cybersec-toolkit
- Path
.claude/skills/analyzing-dns-logs-for-exfiltration/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0, committed Jun 2, 2026
- Size
- 11,545 bytes
- Repository stars
- 87
- License
- MIT
'Analyzes DNS query logs to detect data exfiltration via DNS tunneling,.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Analyzing DNS Logs for Exfiltration ## When to Use Use this skill when: - SOC teams suspect data exfiltration through DNS tunneling to bypass firewall/proxy controls - Threat intelligence indicates adversaries using DNS-based C2 channels (e.g., Cobalt Strike DNS beacon) - UEBA detects anomalous DNS query volumes from specific hosts - Malware analysis reveals DNS-over-HTTPS (DoH) or DNS tunneling capabilities **Do not use** for standard DNS troubleshooting or availability monitoring — this skill focuses on security-relevant DNS abuse detection. ## Prerequisites - DNS query logging enabled (Windows DNS Server, Bind, Infoblox, or Cisco Umbrella) - DNS logs ingested into SIEM (Splunk with `Stream:DNS`, `dns` sourcetype, or Zeek DNS logs) - Passive DNS data for historical domain resolution analysis - Baseline of normal DNS behavior (query volume, domain distribution, TXT record frequency) - Python with `math` and `collections` libraries for entropy calculation ## Workflow ### Step 1: Detect DNS Tunneling via Subdomain Length Analysis DNS tunneling encodes data in subdomain labels, creating unusually long queries: ```spl …
Read the whole file at its exact version.
How to install
mdr add 26zl/cybersec-toolkit/analyzing-dns-logs-for-exfiltration@sha256:f09f70a215a88418The line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_6ppjgbqcgidd5oii)
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Versions
The registry has recorded 1 version of this file, committed on Jun 2, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11545 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
26zl/cybersec-toolkit · 87 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6ppjgbqcgidd5oii GET https://markdownregistry.com/api/v1/resolve?ref=26zl/cybersec-toolkit/analyzing-dns-logs-for-exfiltration GET https://markdownregistry.com/api/v1/blob/f09f70a215a88418c7a46b44c91160107395e1bc2f416f26516e0f4f7ae040b0
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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