analyzing-web-server-logs-for-intrusion

analyzing-web-server-logs-for-intrusion is a skill for Claude Code, Codex from autohandai/community-skills. It costs 73 tokens per session (486 once invoked), scanned A, original, Apache-2.0.

A guide to analyzing Apache and Nginx web-server logs, which record requests sent to a website and the responses it returned.

In plain words
What is it for?
Use it to parse access logs, match attack patterns, enrich source information with GeoIP, and produce prioritized findings.
Why use it?
It helps identify attacks such as SQL injection, file inclusion, directory traversal, scanning, and login brute force.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to parse access logs, match attack patterns, enrich source information with GeoIP, and produce prioritized findings.

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Install with agentmods
npx agentmods add skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add autohandai/community-skills --skill analyzing-web-server-logs-for-intrusion
Clone the repo
git clone --depth 1 https://github.com/autohandai/community-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for analyzing-web-server-logs-for-intrusion

README.md
[![agentmods](https://agentmods.dev/badge/skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion/github.svg)](https://agentmods.dev/skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion)
Your own site
<a href="https://agentmods.dev/skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion"><img src="https://agentmods.dev/badge/skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for analyzing-web-server-logs-for-intrusion

Your own site · 80×15
<a href="https://agentmods.dev/skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion"><img src="https://agentmods.dev/badge/skills/autohandai/community-skills/analyzing-web-server-logs-for-intrusion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 486 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00073 $0.00486
Opus 5 $0.00036 $0.00243
Sonnet 5 $0.00015 $0.00097
Haiku 4.5 $0.00007 $0.00049

Measured 9d ago against content hash 58fa8ab3cc0f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

analyzing-web-server-logs-for-intrusion scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/agent.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

analyzing-web-server-logs-for-intrusion/SKILL.md · 44 lines

What it actually says

Instructions

  1. Install dependencies: pip install geoip2 user-agents
  2. Collect web server access logs in Combined Log Format (Apache) or Nginx default format.
  3. Parse each log entry extracting: IP, timestamp, method, URI, status code, response size, user-agent, referer.
  4. Apply detection rules:
    • SQL injection: UNION SELECT, OR 1=1, ' OR ', hex encoding patterns
    • LFI/Path traversal: ../, /etc/passwd, /proc/self, php://filter
    • XSS: <script>, javascript:, onerror=, onload=
    • Scanner signatures: nikto, sqlmap, dirbuster, gobuster, wfuzz user-agents
    • Brute force: >50 POST requests to login endpoints from same IP in 5 minutes
  5. Enrich with GeoIP data and generate a prioritized findings report.
python scripts/agent.py --log-file /var/log/nginx/access.log --geoip-db GeoLite2-City.mmdb --output web_intrusion_report.json

Examples

Detect SQLi in URI

192.168.1.100 - - [15/Jan/2024:10:30:45 +0000] "GET /products?id=1' UNION SELECT username,password FROM users-- HTTP/1.1" 200 4532

Scanner User-Agent Detection

Nikto/2.1.6, sqlmap/1.7, DirBuster-1.0-RC1, gobuster/3.1.0
Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 44 lines · 73 tokens per session scan A 58fa8ab3cc0f

Subscribe to this mod's changes

analyzing-web-server-logs-for-intrusion is a skill published in the GitHub repository autohandai/community-skills (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 73 tokens to every session and 486 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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