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Defensive Fast Triage

Category: Security  ·  Sub-category: network-security  ·  Last updated:
type:scannertype:debug
Fast blue-team triage checklist for a SOC analyst working an alert queue under time pressure, the defensive answer to a speed-run recon and quick-win scan (MITRE ATT&CK T1595 Active Scanning, T1595.002 Vulnerability Scanning, T1595.003 Wordlist Scanning, T1592 Gather Victim Host Information). Shows how that activity presents in web server and WAF access logs, proxy and firewall egress, Zeek conn metadata, and SIEM tables (Microsoft Sentinel W3CIISLog, AzureDiagnostics WAF, CommonSecurityLog; Splunk web access), then gives a repeatable scope-enrich-pivot-decide workflow, the reputation and enrichment sources to pull, a hunt for the scan that turned into a hit, and escalation hardening mapped to ISO 27001:2022 and NIST CSF 2.0. Use when triaging a SOC alert fast, building an alert triage runbook or playbook, deciding true positive versus false positive, working a noisy scanner or directory-brute-force alert, or standing up a blue-team fast triage checklist.
Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Defensive Fast Triage is a community-contributed Claude Code skill in the network-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/defensive-fast-triage/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when triaging a SOC alert fast, building an alert triage runbook or playbook, deciding true positive versus false positive, working a noisy scanner or directory-brute-force alert, or standing up a blue-team fast triage checklist.

Who uses this skill

The Defensive Fast Triage Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/defensive-fast-triage
curl -L https://claudskills.com/skills/defensive-fast-triage/SKILL.md \
  -o ~/.claude/skills/defensive-fast-triage/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/defensive-fast-triage/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/defensive-fast-triage/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\defensive-fast-triage\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Defensive Fast Triage Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/defensive-fast-triage/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Defensive Fast Triage skill do?
Fast blue-team triage checklist for a SOC analyst working an alert queue under time pressure, the defensive answer to a speed-run recon and quick-win scan (MITRE ATT&CK T1595 Active Scanning, T1595.002 Vulnerability Scanning, T1595.003 Wordlist Scanning, T1592 Gather Victim Host Information). Shows how that activity presents in web server and WAF access logs, proxy and firewall egress, Zeek conn metadata, and SIEM tables (Microsoft Sentinel W3CIISLog, AzureDiagnostics WAF, CommonSecurityLog; Splunk web access), then gives a repeatable scope-enrich-pivot-decide workflow, the reputation and enrichment sources to pull, a hunt for the scan that turned into a hit, and escalation hardening mapped to ISO 27001:2022 and NIST CSF 2.0. Use when triaging a SOC alert fast, building an alert triage runbook or playbook, deciding true positive versus false positive, working a noisy scanner or directory-brute-force alert, or standing up a blue-team fast triage checklist.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Defensive Fast Triage skill?
Use Defensive Fast Triage when your Claude Code task falls under the Security category — specifically in the network security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Defensive Fast Triage" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Defensive Fast Triage skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Defensive Fast Triage is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
umbrasec-labs. (2026). Defensive Fast Triage [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/defensive-fast-triage/
BibTeX
@misc{defensive-fast-triage-2026,
  author    = {umbrasec-labs},
  title     = {Defensive Fast Triage [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/defensive-fast-triage/}
}

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Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/defensive-fast-triage/#security)

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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