What is wazuh-rules-and-decoders?

A guide to reading Wazuh alerts through their decoders and rules. A decoder turns raw log text into fields, while a rule matches those fields and assigns meaning and severity.

Use it to interpret alert fields, correlation rules, decoder output, custom rules and noise-tuning decisions during security triage.

It prevents misreading what triggered an alert, how serious it is or whether repeated alerts are noise. It also helps assess compliance tags, MITRE ATT&CK mappings and proposed rule or decoder changes.

wazuh-rules-and-decoders — Skill for Claude Code by gensecaihq

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 gensecaihq/Wazuh-Autopilot --skill wazuh-rules-and-decoders

Clone the repo

git clone --depth 1 https://github.com/gensecaihq/Wazuh-Autopilot

Made for: Claude Code.

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.

README.md

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Your own site

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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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/gensecaihq/wazuh-autopilot/wazuh-rules-and-decoders"><img src="https://agentmods.dev/badge/skills/gensecaihq/wazuh-autopilot/wazuh-rules-and-decoders.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,452 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.

Model	Per session	Once invoked
Fable 5.1	$0.00062	$0.01452
Opus 5.5	$0.00025	$0.00581
Sonnet 5.5	$0.00012	$0.00290
Haiku 4.5	$0.00006	$0.00145

Measured 1mo ago against content hash 5032e9a59c1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

wazuh-rules-and-decoders 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 1mo ago.

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.

backend/app/skills/wazuh-rules-and-decoders/SKILL.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Wazuh Rules and Decoders

A Wazuh alert is the output of a decoder (which parses a raw log into fields) and a rule (which matches those fields). Misreading the rule is the most common triage error. References below are from the stock Wazuh 4.14 ruleset.

Alert anatomy

Field	Meaning
`rule.id`, `rule.level`, `rule.description`	Which rule fired and how severe Wazuh considers it
`rule.groups`	Categories (e.g. `sshd`, `authentication_failed`, `syscheck`) plus compliance tags
`rule.firedtimes`	How often this rule has fired for this agent since the manager started — high counts mean recurring noise or a sustained attack
`rule.mitre.id / tactic / technique`	ATT&CK mapping shipped with the rule (may be empty)
`rule.frequency`	Present on correlation rules: the threshold that triggered
`agent.id / name / ip`	The endpoint that produced the log (`000` = the manager)
`manager.name`	Which manager/cluster node processed it
`decoder.name` / `decoder.parent`	Which decoder parsed the log (e.g. `sshd`, `windows_eventchannel`, `json`)
`data.*`	Decoded fields: `data.srcip`, `data.srcuser`, `data.dstuser`, `data.win.`, `data.aws.` …
`syscheck.*`	FIM fields (only on syscheck alerts)
`full_log`	The raw log line — attacker-controllable text
`location`	Source: file path, `EventChannel`, `syscheck`, `rootcheck`, integration name

Level scale (0–15)

Level	Wazuh meaning	Handling
0	Ignored / grouping rule, no alert	Never alerts; used as parents and for suppression
2–4	System notifications, low-relevance errors, successful events	Context only
5–7	User-generated errors, "bad word" matches, first-time or low-impact events	Watch for patterns
8–10	First-time-seen events, repeated errors, possible attacks	Triage
11–12	Integrity/important security events	Prioritize
13–15	High-importance events, attacks with high likelihood of success	Immediate

Read the full file on GitHub · 96 lines

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.

1mo ago First seen · 96 lines · 62 tokens per session scan A 5032e9a59c1b

Subscribe to this mod's changes

wazuh-rules-and-decoders is a skill published in the GitHub repository gensecaihq/Wazuh-Autopilot (63 stars, last pushed 1mo ago), licensed MIT. It adds 62 tokens to every session and 1,452 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-25.

Autonomous Agents Debugging Security agentic-ai mcp security-automation siem soc

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