writing-a-malware-analysis-report

writing-a-malware-analysis-report is a skill for Claude Code, Codex from meltedinhex/analyst-ai-pack. It costs 62 tokens per session (971 once invoked), scanned A, original, Apache-2.0.

A guide for writing malware analysis reports that summarize what a malicious file is, what it does, and how to detect it.

In plain words
What is it for?
Use it to document sample identity, capabilities, indicators of compromise, ATT&CK techniques, and detection guidance after analysis.
Why use it?
It turns scattered analysis results into a consistent report that responders, detection engineers, and non-specialist decision-makers can use.

Skill for Claude CodeCodex

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

Good fit Use it to document sample identity, capabilities, indicators of compromise, ATT&CK techniques, and detection guidance after analysis.

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Install with agentmods
npx agentmods add skills/meltedinhex/analyst-ai-pack/writing-a-malware-analysis-report
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 writing-a-malware-analysis-report
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 writing-a-malware-analysis-report

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/meltedinhex/analyst-ai-pack/writing-a-malware-analysis-report"><img src="https://agentmods.dev/badge/skills/meltedinhex/analyst-ai-pack/writing-a-malware-analysis-report.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 971 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 $0.00062 $0.00971
Opus 5 $0.00031 $0.00485
Sonnet 5 $0.00012 $0.00194
Haiku 4.5 $0.00006 $0.00097

Measured 6d ago against content hash 26df4c85384b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

writing-a-malware-analysis-report 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 6d 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/writing-a-malware-analysis-report/SKILL.md · 116 lines

How it starts

The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Writing a Malware Analysis Report

When to Use

  • You have completed static, dynamic, or reverse-engineering analysis and need to communicate findings to responders, detection engineers, and leadership.
  • You need a consistent report structure so findings are actionable and comparable across samples.
  • You are reviewing a draft report for completeness before distribution.

Do not use this as a substitute for analysis; a report only documents work already done. Do not pad a report with tool output that has no analytic conclusion.

Prerequisites

  • Completed analysis artifacts: sample hashes, behavioral notes, extracted IOCs, screenshots, and any reversed routines.
  • An ATT&CK reference for mapping observed behaviors to techniques.

Workflow

Step 1: Lead with an executive summary

Three to five sentences a non-analyst can act on: what the sample is, what it does, the risk, and the recommended action. State your confidence and the basis for it.

Step 2: Record sample identity

A table the reader can match against their telemetry:

Filename (as received) : invoice.exe
SHA-256                : 9f86d0818...
SHA-1 / MD5            : ...
File type / size        : PE32 executable / 412 KB
First seen / source     : 2026-06-20 / MalwareBazaar
Signing                 : unsigned / invalid certificate

Step 3: Describe capabilities, not just events

Group findings by capability (persistence, C2, defense evasion, collection), each with the evidence and the ATT&CK technique:

Persistence  : Run key HKCU\...\Run "Updater" -> %APPDATA%\svc.exe   [T1547.001]
C2           : HTTPS beacon to evil[.]com/api every 60s +/- jitter   [T1071.001]
Defense evasion: UPX-packed; checks for VM artifacts before running  [T1027, T1497]

Step 4: Provide IOCs in a usable form

Defanged for reading, plus a machine-ingestible block (CSV/STIX/MISP) for detection teams. Separate host IOCs (paths, registry keys, mutexes) from network IOCs (domains, IPs, URLs, JA3).

Read the full file on GitHub · 116 lines

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. 6d ago First seen · 116 lines · 62 tokens per session scan A 26df4c85384b

Subscribe to this mod's changes

writing-a-malware-analysis-report is a skill published in the GitHub repository meltedinhex/analyst-ai-pack (22 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 62 tokens to every session and 971 once invoked, about $0.0003 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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