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Security audit

safe-seller-toolkit

Security checks for vulnerabilities and agentic risk

Overview

This skill is a coherent offline marketplace-seller safety toolkit and does not show hidden, destructive, or privilege-seeking behavior.

Reasonable to install if you want offline help evaluating marketplace sales. Treat its pricing and scam scores as guidance, not a guarantee, and still follow the rules of the marketplace and payment platform you use.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • 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
Findings (2)

YARA rule 'ransomware_behavior': Ransomware-like patterns (mass encryption, ransom notes) [malware]

Critical
Category
YARA Match
Confidence
80% confidence
Finding

YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).

Content

Scanner excerpt · references/scam-field-guide.md (reported line 30)May include surrounding context.

md
sfer. Your refund of $150 is real money leaving your account.
The original never existed or gets clawed back.

**Counter:** never refund anything. If a payment arrives for the wrong
amount, tell them to cancel it on their end and re-send the right one. Then
watch it never happen.

## 3. Off-platform payment (+30)
**Script:** "Let's skip fees — Zelle / Venmo friends-and-family / Cash App /
Apple Pay / gift cards / Bitcoin."

**Mechanics:** platform payment systems exist precisely to protect both
sides. Off-platform peer transfers have zero buyer/seller protection and are
explicitly against marketplace rules (account ban risk). Gift cards and
crypto are irreversible and untraceable — the preferred rail of every scam.

**Counter:** on-platform payment or cash-in-hand, full stop. "Friends and
family" specifically waives even PayPal's own protections.

## 4. Off-platform shipping / courier pickup (+30)
**Script:** "I'm out of town — my shipper/mover/agent will collect it. I'll
email a

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 44)May include surrounding context.

md
- Selling high-value items ($300+ phones, bikes, cameras, laptops)

**Don't use for:** business/inventory-scale selling (different economics),
real-estate or vehicle-title transfers (legal process beyond scope), or as a
substitute for platform-specific dispute processes once fraud already
happened (report + chargeback paths differ by platform).