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Security audit

Decrypto Coach（截码战、谍报风云）

Security checks for vulnerabilities and agentic risk

Overview

This is a markdown-only Decrypto board-game coaching skill with no executable behavior, persistence, credential access, or system-level authority.

Install this if you want a Decrypto strategy helper. It may encourage competitive misdirection and pre-agreed clue systems as part of normal board-game play, but I found no evidence of code execution, data access, persistence, or hidden behavior.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • YARA SignaturesMalware Match, Webshell Match, Cryptominer Match
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

YARA rule 'network_reconnaissance': Network reconnaissance and scanning patterns [hacktools]

Medium
Category
YARA Match
Content
ires teammates who can think in character structure. Pre-align this technique before the game.
⚠️ 需要队友具备拆字思维，赛前约定好使用此技巧。

#### Antonym Mapping / 反义词映射

Give the antonym of a character within the keyword, not the keyword itself.
给出关键词中某个字的反义词。

- **吉他 (guitar)** → 线索"凶" (凶是吉的反义词) / clue "fierce" (antonym of 吉/lucky)
- **黑板 (blackboard)** → 线索"白" (黑的反义词) / clue "white" (antonym of 黑/black)
- **高山 (mountain)** → 线索"低" (高的反义词) / clue "low" (antonym of 高/high)
- **前进 (advance)** → 线索"后" (前的反义词) / clue "behind" (antonym of 前/front)

Why it works: opponents hear "凶" and think violence/danger, never reversing it to 吉→吉他.
为什么有效：对手听到"凶"只会想到凶猛、危险，不会反转成吉→吉他。

#### Homophone Redirect / 谐音跳转

Use a word that sounds like part of the keywor
Confidence
65% confidence
Finding
YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).

Natural-Language Policy Violations

Low
Confidence
81% confidence
Finding
The guide introduces a 'Chinese-specific' section and later an 'English-speaking games' section as prescriptive strategy modes tied to particular languages. Because the document does not explicitly offer a user language preference or clarify that these sections are optional examples, it can be read as enforcing language-specific behavior without opt-in.

Static analysis

No suspicious patterns detected.