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lazarus-group

Adversary-emulation profile for Lazarus Group (G0032, aka Hidden Cobra / Diamond Sleet / Labyrinth Chollima), a North Korean RGB-linked actor conducting espionage, destructive, and financially motivated operations.

Quality

70%

Does it follow best practices?

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SecuritybySnyk

Critical

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Fix and improve this skill with Tessl

tessl review fix ./packages/decepticon/decepticon/skills/shared/adversary-emulation/lazarus-group/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

63%Weight 40%Scale 1-5

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

The body is a well-organized, source-anchored adversary-emulation profile with concrete TTP-to-capability mapping and explicit safety controls for destructive ops. Its main weaknesses are background prose that pads the token budget and a monolithic structure that could benefit from splitting detailed reference material into bundle files.

Suggestions

Trim the opening paragraph and 'Attribution & motivation' background re-explanation to the non-obvious facts only (RGB attribution, DOJ/Park Jin Hyok anchor), cutting prose Claude already knows.

Move the full TTP-by-tactic catalog, signature-tooling list, and campaign timeline into separate reference files (e.g., references/ttps.md, references/campaigns.md) and link to them from SKILL.md to improve progressive disclosure.

Add a short numbered 'emulation workflow' checklist at the top of the emulation-guidance section (plan scope → initial access → C2 → persist → … → validate detections) with an explicit validation step to push workflow clarity toward 5.

DimensionReasoningScore

Conciseness

The body is a dense factual reference (TTP IDs, malware S-numbers, sourced campaigns) that mostly earns its tokens, but the opening paragraph and 'Attribution & motivation' section re-explain background history Claude largely already knows and could be tightened, matching 'mostly efficient but includes some unnecessary explanation'.

3 / 5

Actionability

The emulation-guidance section maps each TTP to concrete capabilities and named sibling skills ('deploy Sliver with HTTPS/mTLS profiles, jitter, fallback listeners', 'defense-evasion skill', 'AD and lateral-movement skills'), and detection guidance cites specific telemetry; minor gaps keep it just below fully executable.

4 / 5

Workflow Clarity

Emulation guidance is sequenced as a clear behavior chain (initial access → trojanized app → C2 → execution/persistence → evasion → creds → discovery/lateral → collection/exfil → impact) with explicit safety checkpoints for destructive ops ('do not run real wipers', 'controlled, reversible marker'), satisfying the destructive-operation validation requirement; it is a mapping rather than a strict feedback-loop procedure, so not a 5.

4 / 5

Progressive Disclosure

Sections are well-headered and self-contained with no nested references, but the file is a monolithic ~135-line document whose detailed TTP-by-tactic catalog, signature-tooling list, and campaign timeline could reasonably live in separate reference files; with no bundle files present this matches 'some structure but content that should be separate is inline'.

3 / 5

Total

14

/

20

Passed

Description

65%Weight 40%Scale 1-5

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 clearly identifies a distinct niche (Lazarus Group adversary emulation) with strong alias coverage, but it lacks an explicit 'Use when…' trigger clause and frames actions as the actor's behavior rather than the skill's concrete capabilities.

Suggestions

Append a 'Use when…' clause to the description (e.g., 'Use when emulating North Korean APT activity, Lazarus/Hidden Cobra/Diamond Sleet TTPs, or DPRK financial-espionage scenarios') to satisfy the completeness 'when' requirement.

Reframe the action list around what the skill does (e.g., 'Profiles Lazarus Group TTPs, maps them to emulation capabilities, and provides detection guidance') rather than only what the actor does, to lift specificity.

DimensionReasoningScore

Specificity

Names the domain ('Adversary-emulation profile for Lazarus Group') and a few concrete mission categories ('espionage, destructive, and financially motivated operations'), but these describe the actor rather than comprehensively listing what the skill itself does, matching the 'names domain and 1-2 concrete actions' anchor.

3 / 5

Completeness

Provides a clear 'what' (an adversary-emulation profile of Lazarus Group) but no 'Use when…' or equivalent explicit trigger clause in the description field, which per the judging guidelines caps completeness at 3.

3 / 5

Trigger Term Quality

Includes multiple natural aliases a user would say ('Lazarus Group', 'G0032', 'Hidden Cobra', 'Diamond Sleet', 'Labyrinth Chollima', 'North Korean', 'RGB'); a few common trigger phrases (e.g. 'emulate', 'WannaCry', 'FASTCash') are absent from the description field itself, so it sits just below the comprehensive anchor.

4 / 5

Distinctiveness Conflict Risk

A highly specific, named threat-actor emulation niche with distinct alias triggers and minimal overlap with other skills, matching the 'clear niche with distinct triggers; minimal conflict risk' anchor.

5 / 5

Total

15

/

20

Passed

Validation

93%

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

CriteriaDescriptionResult

metadata_version

'metadata.version' is missing

Warning

Total

15

/

16

Passed

Repository

PurpleAILAB/Decepticon

Path

packages/decepticon/decepticon/skills/shared/adversary-emulation/lazarus-group/SKILL.md

Reviewed

Table of Contents

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