spawn_shellcode · Cobalt Strike MCP Server MCP

WHAT IT DOES

What spawn_shellcode does on Cobalt Strike MCP Server

AI agents invoke spawn_shellcode to trigger actions in Cobalt Strike MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why spawn_shellcode needs a policy

This tool executes arbitrary shellcode in spawn mode, which runs code whose effects are entirely determined by the shellcode payload itself. While not strictly irreversible like Destructive actions, shellcode execution is a highest-impact Execute action—it can lead to privilege escalation, system compromise, malware installation, or any attack an adversary designs.

From the tool's definition Tool name 'spawn_shellcode' and description 'Execute shellcode (spawn mode)' explicitly indicate arbitrary code execution.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

spawn_shellcode Rate-limited

spawn_shellcode stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "spawn_shellcode": {
      "limits": [
        {
          "counter": "spawn_shellcode_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Cobalt Strike MCP Server, so you can run agents against it safely.

FAQ

Questions about spawn_shellcode

What does the spawn_shellcode tool do? +

Execute shellcode (spawn mode). It is categorised as a Execute tool in the Cobalt Strike MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on spawn_shellcode? +

Register the Cobalt Strike MCP Server MCP server in PolicyLayer and add a rule for spawn_shellcode: 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 Cobalt Strike MCP Server. Nothing to install.

What risk level is spawn_shellcode? +

spawn_shellcode is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit spawn_shellcode? +

Yes. Add a rate_limit block to the spawn_shellcode 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.

How do I block spawn_shellcode completely? +

Set action: deny in the PolicyLayer policy for spawn_shellcode. 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.

What MCP server provides spawn_shellcode? +

spawn_shellcode is provided by the Cobalt Strike MCP Server MCP server (mickeydb/cobalt-strike-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.