operationalizing-a-hunt-into-a-detection

operationalizing-a-hunt-into-a-detection is a skill for Claude Code, Codex from meltedinhex/analyst-ai-pack. It costs 75 tokens per session (669 once invoked), scanned A, original, Apache-2.0.

A detection-engineering guide that turns a successful threat hunt into a Sigma rule, a portable description of a security detection. It defines the needed logs, matching conditions, thresholds, tests, and tuning work.

In plain words
What is it for?
Use it to generate Sigma rule scaffolding, document data sources and ATT&CK tags, and plan validation and tuning before deployment.
Why use it?
A one-time investigation does not automatically catch the same activity later. Formalizing its distinguishing logic makes repeatable detection possible and highlights likely false positives.

Skill for Claude CodeCodex

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

Good fit Use it to generate Sigma rule scaffolding, document data sources and ATT&CK tags, and plan validation and tuning before deployment.

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Install with agentmods
npx agentmods add skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection
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 meltedinhex/analyst-ai-pack --skill operationalizing-a-hunt-into-a-detection
Clone the repo
git clone --depth 1 https://github.com/meltedinhex/analyst-ai-pack

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 operationalizing-a-hunt-into-a-detection

README.md
[![agentmods](https://agentmods.dev/badge/skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection/github.svg)](https://agentmods.dev/skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection)
Your own site
<a href="https://agentmods.dev/skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection"><img src="https://agentmods.dev/badge/skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection/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 operationalizing-a-hunt-into-a-detection

Your own site · 80×15
<a href="https://agentmods.dev/skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection"><img src="https://agentmods.dev/badge/skills/meltedinhex/analyst-ai-pack/operationalizing-a-hunt-into-a-detection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 669 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 $0.00075 $0.00669
Opus 5 $0.00037 $0.00334
Sonnet 5 $0.00015 $0.00134
Haiku 4.5 $0.00007 $0.00067

Measured 7d ago against content hash 5e2b447118f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

operationalizing-a-hunt-into-a-detection 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 7d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/analyst.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.

skills/operationalizing-a-hunt-into-a-detection/SKILL.md · 87 lines

What it actually says

Operationalizing a Hunt Into a Detection

When to Use

  • A hunt surfaced malicious activity and you want to convert the discriminating logic into a repeatable detection (Sigma) with data sources, thresholds, and a tuning plan.
  • You are closing the hunt→detect loop so the finding is caught automatically next time.

Do not use this to ship a rule without a false-positive review — operationalization includes tuning. The script generates rule scaffolding, not a deployment.

Prerequisites

  • The hunt's discriminating fields/values, the data source/log channel, and the mapped ATT&CK technique.

Workflow

Step 1: Specify the detection

Define the logsource (category/product), the selection (field→value(s) that discriminated true positives), optional filters, the condition, and the ATT&CK technique.

Step 2: Generate the Sigma rule

python scripts/analyst.py generate --spec detection.json --out rule.yml

Emits a valid Sigma rule (title, status, logsource, detection, condition, level, tags) from the spec.

Step 3: Plan testing and tuning

Define how to validate (replay a known-true pcap/log, atomic test) and what benign sources may cause false positives.

Step 4: Document and stage

Record the rule's intent, expected FPs, and tuning levers; stage through your detection pipeline.

Validation

  • The generated rule has logsource, detection, and condition keys.
  • The selection encodes the fields/values that discriminated the hunt's true positives.
  • The rule is tagged with the relevant ATT&CK technique.

Pitfalls

  • Encoding incidental artifacts (one host's path) instead of generalizable logic.
  • Omitting filters for known-benign sources, guaranteeing alert fatigue.
  • No test plan, so regressions go unnoticed.

References

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. 7d ago First seen · 87 lines · 75 tokens per session scan A 5e2b447118f7

Subscribe to this mod's changes

operationalizing-a-hunt-into-a-detection is a skill published in the GitHub repository meltedinhex/analyst-ai-pack (22 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 75 tokens to every session and 669 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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