analyzing-malware-behavior-with-cuckoo-sandbox
Executes malware samples in Cuckoo Sandbox to observe runtime behavior including process creation, file system modifications, registry changes, network communications, and API calls. Generates comprehensive behavioral reports for malware classification and IOC extraction. Activates for requests involving dynamic malware analysis, sandbox detonation, behavioral analysis, or automated malware execution.
76
71%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Advisory
Suggest reviewing before use
Optimize this skill with Tessl
npx tessl skill review --optimize ./skills/analyzing-malware-behavior-with-cuckoo-sandbox/SKILL.mdQuality
Discovery
100%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is an excellent skill description that clearly articulates specific capabilities (runtime behavior observation, report generation, IOC extraction), names the specific tool (Cuckoo Sandbox), and provides explicit activation triggers. It uses proper third-person voice throughout and covers both the 'what' and 'when' comprehensively with domain-appropriate terminology.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: executing malware samples, observing process creation, file system modifications, registry changes, network communications, API calls, generating behavioral reports, malware classification, and IOC extraction. | 3 / 3 |
Completeness | Clearly answers both 'what' (executes malware in Cuckoo Sandbox, observes runtime behavior, generates reports) and 'when' ('Activates for requests involving dynamic malware analysis, sandbox detonation, behavioral analysis, or automated malware execution'). | 3 / 3 |
Trigger Term Quality | Includes strong natural trigger terms users would say: 'malware', 'Cuckoo Sandbox', 'dynamic malware analysis', 'sandbox detonation', 'behavioral analysis', 'automated malware execution', 'IOC extraction', 'behavioral reports'. These cover the key vocabulary a security analyst would use. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with a clear niche: Cuckoo Sandbox-based dynamic malware analysis. The specific tool name and domain (malware detonation/behavioral analysis) make it very unlikely to conflict with other skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
42%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
The skill excels in actionability with comprehensive, executable code examples covering the entire Cuckoo Sandbox analysis workflow. However, it is significantly over-engineered as a single monolithic document—glossary tables, tool descriptions, and detailed output templates bloat the content well beyond what's needed in a SKILL.md. It also lacks validation checkpoints and feedback loops in the workflow despite dealing with potentially dangerous malware execution.
Suggestions
Move the Key Concepts table, Tools & Systems section, Common Scenarios, and Output Format template into separate referenced files (e.g., CONCEPTS.md, SCENARIOS.md, OUTPUT_TEMPLATE.md) to reduce SKILL.md to a lean overview.
Remove explanations of concepts Claude already knows (dynamic analysis definitions, what InetSim is, what process injection means) to cut token usage significantly.
Add explicit validation checkpoints in the workflow: verify VM snapshot integrity before submission, confirm task completed successfully before parsing reports, validate network isolation before executing known-dangerous samples.
Add a feedback loop for sandbox evasion: 'If the sample exits within seconds or shows minimal activity, suspect evasion—resubmit with anti-evasion packages or modified VM configuration.'
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is extremely verbose at ~200+ lines. The Key Concepts table explains terms like 'Dynamic Analysis' and 'Process Injection' that Claude already knows. The Tools & Systems section describes well-known tools unnecessarily. The When to Use section over-explains obvious use cases. Much of this content could be cut by 50%+ without losing actionable value. | 1 / 3 |
Actionability | The skill provides fully executable bash commands and Python code for every step—submission, monitoring, parsing reports, network analysis, file system review, signature extraction, and memory analysis. All code is copy-paste ready with specific file paths, API endpoints, and data structures. | 3 / 3 |
Workflow Clarity | The 7-step workflow is clearly sequenced and covers the full analysis pipeline. However, there are no explicit validation checkpoints or feedback loops—no step says 'verify the VM snapshot is clean before proceeding' or 'if task status shows failed, check X and retry.' The safety warning about ransomware is mentioned in When to Use but not integrated into the workflow itself. | 2 / 3 |
Progressive Disclosure | This is a monolithic wall of text with no references to external files. The Key Concepts table, Tools & Systems section, Common Scenarios, and detailed Output Format template could all be split into separate reference files. Everything is inlined, making the skill unnecessarily long for the SKILL.md overview. | 1 / 3 |
Total | 7 / 12 Passed |
Validation
90%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 10 / 11 Passed
Validation for skill structure
| Criteria | Description | Result |
|---|---|---|
frontmatter_unknown_keys | Unknown frontmatter key(s) found; consider removing or moving to metadata | Warning |
Total | 10 / 11 Passed | |
- Repository
- mukul975/Anthropic-Cybersecurity-Skills
- Commit
888bbe4
- Reviewed
Table of Contents
Is this your skill?
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.