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Security audit

Yys Wallpaper

Security checks across malware telemetry and agentic risk

Overview

This is a straightforward wallpaper downloader that contacts the disclosed NetEase pages and saves images locally, with minor documentation inconsistencies users should notice.

Install only if you want to download Onmyoji wallpapers from NetEase. Expect potentially large local downloads under ~/Pictures/{resolution}/, and use --no-skip only when you intentionally want files re-downloaded.

SkillSpector

By NVIDIA
Vulnerability Patterns
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

Lp3

Medium
Category
MCP Least Privilege
Confidence
88% confidence
Finding
The skill documentation describes file and network behavior, but no permissions are declared. In an agent ecosystem, undeclared capabilities reduce transparency and informed consent, making it easier for a skill to access local files and external resources without clear user or platform awareness. The risk is moderated by the skill’s stated wallpaper-download purpose, but the missing declaration is still a real security governance issue.

Tp4

High
Category
MCP Tool Poisoning
Confidence
84% confidence
Finding
The skill’s stated behavior does not fully match the documented/implemented behavior: it says files go to ~/图片/{分辨率}/ and are skipped if present, but later states ~/Pictures/{分辨率}/ and exposes a --no-skip option. Behavioral mismatches matter because users may consent based on one storage location and one data-handling policy while the tool actually writes elsewhere or re-downloads content unexpectedly, undermining predictability and trust.

VirusTotal

65/65 vendors flagged this skill as clean.

View on VirusTotal

Static analysis

No suspicious patterns detected.