Look up file hash (MD5/SHA1/SHA256) on VirusTotal for threat intelligence.
AI agents call vt_lookup_hash to retrieve information from Windows Forensics MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
VirusTotal hash lookups are passive queries against external threat intelligence services. They retrieve pre-existing analysis results without modifying any data, executing code, or causing irreversible changes. The tool poses minimal risk even if misused by an AI agent—the worst outcome is information disclosure or excessive API calls, not system compromise or data loss.
From the tool's definition Tool 'vt_lookup_hash' performs a lookup of file hashes on VirusTotal, which is a read-only query operation retrieving threat intelligence data.
Documented attack patterns abuse exactly the kind of access vt_lookup_hash gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Windows Forensics MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for vt_lookup_hash:
{
"version": "1",
"default": "deny",
"tools": {
"vt_lookup_hash": {}
}
}vt_lookup_hash is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up file hash (MD5/SHA1/SHA256) on VirusTotal for threat intelligence. It is categorised as a Read tool in the Windows Forensics MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Windows Forensics MCP Server MCP server in PolicyLayer and add a rule for vt_lookup_hash: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Windows Forensics MCP Server. Nothing to install.
vt_lookup_hash is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the vt_lookup_hash rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for vt_lookup_hash. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
vt_lookup_hash is provided by the Windows Forensics MCP Server MCP server (x746b/winforensics-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Windows Forensics MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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61 Windows Forensics MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.