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Detect Initial Access

Category: Security  ·  Sub-category: network-security  ·  Last updated:
Detection methodology for initial access via exploitation of public-facing applications and the payload delivery that follows (MITRE ATT&CK T1190, T1133, T1105, tactic TA0001). Generalises defender lessons from two 2026 cases, the Metabase unauthenticated SQL injection (CVE-2026-72898) and the N-able N-central authentication bypasses (CVE-2026-18556, CVE-2026-18577): the attack shows up first as anomalous requests to an unauthenticated edge endpoint, then as an unexpected process or outbound connection on the host behind it. Log sources: reverse-proxy and WAF access logs, netflow and firewall egress, and host process-creation and service-install telemetry (Sysmon Event ID 1 or Windows Security 4688, System 7045). Gives the method, the signals, a hunt, and the hardening. Use when triaging a possible exploit of an internet-facing app, hunting for initial access or first-stage payload delivery, or hardening the exposed attack surface.
Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Detect Initial Access 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/detect-initial-access/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when triaging a possible exploit of an internet-facing app, hunting for initial access or first-stage payload delivery, or hardening the exposed attack surface.

Who uses this skill

The Detect Initial Access 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/detect-initial-access
curl -L https://claudskills.com/skills/detect-initial-access/SKILL.md \
  -o ~/.claude/skills/detect-initial-access/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/detect-initial-access/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/detect-initial-access/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\detect-initial-access\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 Detect Initial Access Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/detect-initial-access/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Detect Initial Access skill do?
Detection methodology for initial access via exploitation of public-facing applications and the payload delivery that follows (MITRE ATT&CK T1190, T1133, T1105, tactic TA0001). Generalises defender lessons from two 2026 cases, the Metabase unauthenticated SQL injection (CVE-2026-72898) and the N-able N-central authentication bypasses (CVE-2026-18556, CVE-2026-18577): the attack shows up first as anomalous requests to an unauthenticated edge endpoint, then as an unexpected process or outbound connection on the host behind it. Log sources: reverse-proxy and WAF access logs, netflow and firewall egress, and host process-creation and service-install telemetry (Sysmon Event ID 1 or Windows Security 4688, System 7045). Gives the method, the signals, a hunt, and the hardening. Use when triaging a possible exploit of an internet-facing app, hunting for initial access or first-stage payload delivery, or hardening the exposed attack surface.
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 Detect Initial Access skill?
Use Detect Initial Access 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 Detect Initial Access" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Detect Initial Access 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. Detect Initial Access 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). Detect Initial Access [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/detect-initial-access/
BibTeX
@misc{detect-initial-access-2026,
  author    = {umbrasec-labs},
  title     = {Detect Initial Access [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/detect-initial-access/}
}

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Security scan

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

The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/detect-initial-access/#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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