analyzing-cobalt-strike-beacon-configuration

Extract and analyze Cobalt Strike beacon configuration from PE files and memory dumps to identify C2 infrastructure, malleable profiles, and operator tradecraft.

Quality

—

Does it follow best practices?

Impact

—

No eval scenarios have been run

Securityby

Risky

Do not use without reviewing

Quality

Content

77%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The content is highly actionable with executable code and a clear, validated workflow, but it is somewhat verbose and fails to use its own bundle files — inlining scripts instead of referencing them. Tightening prose and linking the existing scripts/assets/references would lift the weaker dimensions.

Suggestions

Move the four inline Python scripts into the existing scripts/ bundle and reference them (e.g., 'See scripts/ for extract_beacon_config.py'), keeping only short illustrative snippets inline.

Link assets/template.md in the Validation Criteria or Workflow section so analysts know a report template exists.

Trim the Overview and Key Concepts to operational specifics (XOR keys, TLV layout, watermark use) and drop general Cobalt Strike background Claude already knows.

Dimension	Reasoning	Score
Conciseness	The body is mostly efficient and skill-specific (XOR keys, TLV type maps) but the Overview and Key Concepts restate background an IR analyst — and Claude — already know, and prose around the code could be tightened; not quite the lean 'every token earns its place' anchor at 3.	2 / 3
Actionability	Provides four complete, executable Python scripts plus a YARA rule and Suricata signatures that are copy-paste ready, matching the fully-executable anchor rather than the pseudocode anchor at 2.	3 / 3
Workflow Clarity	Steps 1–4 are clearly sequenced, the manual decryption step includes a feedback loop (tries v4 then v3 XOR keys, reports found/not-found), and a Validation Criteria checklist closes the process, meeting the explicit-validation anchor.	3 / 3
Progressive Disclosure	Sections are organized and external web links are present, but the provided bundle files (scripts/, assets/template.md, references/) are never referenced from the body and four long code blocks are inlined rather than split out, fitting the 'content that should be separate is inline / references not signaled' anchor at 2 rather than the well-signaled one-level-deep anchor at 3.	2 / 3
	Total	10 / 12 Passed

Description

82%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is specific and well-targeted with strong natural trigger terms and low conflict risk, but it omits an explicit 'Use when...' clause, capping completeness at 2. Adding a trigger guidance sentence would raise it to a fully strong description.

Suggestions

Append an explicit trigger clause such as 'Use when analyzing Cobalt Strike beacon payloads, responding to incidents involving beacon artifacts, or hunting for C2 infrastructure.' to satisfy the 'when' half of completeness.

Mirror common phrasings users might say (e.g., 'beacon config', 'CS beacon', 'stager shellcode') to broaden natural trigger coverage.

Dimension	Reasoning	Score
Specificity	Lists multiple concrete actions — 'Extract and analyze Cobalt Strike beacon configuration' and 'identify C2 infrastructure, malleable profiles, and operator tradecraft' — matching the multiple-specific-actions anchor rather than the single-domain anchor at 2.	3 / 3
Completeness	Clearly states what the skill does but lacks any 'Use when...' clause or explicit trigger guidance, so per the judging guidelines completeness is capped at 2 rather than reaching the explicit-both anchor at 3.	2 / 3
Trigger Term Quality	Uses natural terms an analyst would actually say ('Cobalt Strike beacon configuration', 'PE files', 'memory dumps', 'C2 infrastructure', 'malleable profiles') with good coverage, not generic jargon.	3 / 3
Distinctiveness Conflict Risk	Targets a narrow, well-defined niche (Cobalt Strike beacon config extraction) with distinct triggers, making conflict with other skills unlikely and clearly above the 'could still overlap' anchor at 2.	3 / 3
	Total	11 / 12 Passed

Validation

93%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 15 / 16 Passed

Validation for skill structure

Criteria	Description	Result
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	15 / 16 Passed

Repository: mukul975/Anthropic-Cybersecurity-Skills
Commit: 673da1f

Reviewed: 13 days ago

Table of Contents

Discovery Implementation Validation

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