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Security audit

Handshake58 - Payments for AI Agents

Security checks for vulnerabilities and agentic risk

Overview

The skill has a coherent payment purpose, but it asks users to install an unpinned global package and give it a funded wallet private key, which needs careful review before use.

Use only a dedicated low-value wallet, never a main wallet or reusable key. Before installing, verify the drain-mcp package/source yourself, prefer a pinned reviewed version, and understand that the local MCP process can sign transactions and paid requests with the configured wallet key.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • 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
Findings (1)

T08 · Insecure Dependencies

Error
Location
SKILL.md:53
Finding

Unpinned Global Dependency Receives a Funded Wallet Private Key

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 74)May include surrounding context.

No POL needed — if your wallet holds $5+ USDC, free gas is provided:

bash
curl -X POST https://handshake58.com/api/gas-station \
  -H "Content-Type: application/json" \
  -d '{"address": "0x_your_wallet_address"}'

Scope Creep

Low
Category
Excessive Agency
Confidence
70% confidence
Finding

Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.

Content

Scanner excerpt · SKILL.md (reported line 228)May include surrounding context.

md
## Provider Categories

Providers are not limited to LLM chat. Each has a `category` and a docs endpoint.

| Category | Examples | How to Call |
|---|---|---|

Static analysis

No suspicious patterns detected.