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.
npx skills add Liberty91LTD/cti-skills --skill malware-analysisgit clone --depth 1 https://github.com/Liberty91LTD/cti-skillsWrote 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.
[](https://agentmods.dev/skills/liberty91ltd/cti-skills/malware-analysis)<a href="https://agentmods.dev/skills/liberty91ltd/cti-skills/malware-analysis"><img src="https://agentmods.dev/badge/skills/liberty91ltd/cti-skills/malware-analysis/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.
<a href="https://agentmods.dev/skills/liberty91ltd/cti-skills/malware-analysis"><img src="https://agentmods.dev/badge/skills/liberty91ltd/cti-skills/malware-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00055 | $0.01642 |
| Opus 5 | $0.00028 | $0.00821 |
| Sonnet 5 | $0.00011 | $0.00328 |
| Haiku 4.5 | $0.00006 | $0.00164 |
Grade A, and why
malware-analysis 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Malware Analysis Guide
This skill provides analytical guidance for understanding malware samples. It does NOT execute malware — it tells you what to look for in analysis reports, sandbox results, and VirusTotal data.
Static Analysis
PE Header Analysis
- Compilation timestamp: When was it compiled? Anomalous dates suggest timestomping.
- Sections: Unusual section names (not .text/.data/.rss/.reloc) suggest packing or custom builders.
- Entropy: High entropy (>7.0) in sections suggests encryption or compression (packed).
- Imports: Key suspicious imports indicate behavior:
| Import | Indicates |
|---|---|
| VirtualAlloc, VirtualProtect | Memory manipulation (injection, unpacking) |
| CreateRemoteThread, WriteProcessMemory | Process injection (T1055) |
| RegSetValueEx, RegCreateKeyEx | Registry persistence (T1547) |
| InternetOpenUrl, HttpSendRequest | Network communication (T1071) |
| CryptEncrypt, CryptDecrypt | Encryption (ransomware or C2 encryption) |
| CreateService, StartService | Service persistence (T1543) |
| AdjustTokenPrivileges | Privilege escalation (T1134) |
| IsDebuggerPresent, CheckRemoteDebuggerPresent | Anti-analysis (T1622) |
String Analysis
Look for:
- URLs, IP addresses, domain names (C2 infrastructure)
- File paths (drop locations, persistence targets)
- Registry keys (persistence mechanisms)
- User-Agent strings (C2 communication patterns)
- Encryption keys or encoded data
- Error messages or debug strings (developer artifacts)
- Mutex names (used to prevent multiple instances)
Packer Identification
Common packers: UPX, Themida, VMProtect, ASPack, MPRESS. Packed samples need unpacking before full static analysis. High entropy + few meaningful strings = likely packed.
Dynamic Analysis (Sandbox Interpretation)
Process Behavior
- Child processes spawned (especially cmd.exe, powershell.exe, wscript.exe)
- Process injection into legitimate processes (svchost, explorer, lsass)
- Privilege escalation attempts
- Anti-analysis checks (VM detection, sandbox detection, timing checks)
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.
- 10d ago First seen · 124 lines · 55 tokens per session scan A c465d59fd9e6
malware-analysis is a skill published in the GitHub repository Liberty91LTD/cti-skills (17 stars, last pushed 1mo ago), licensed MIT. It adds 55 tokens to every session and 1,642 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 2026-08-30.
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