spawn_beacon_under · Cobalt Strike MCP Server MCP

WHAT IT DOES

What spawn_beacon_under does on Cobalt Strike MCP Server

AI agents invoke spawn_beacon_under 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_beacon_under needs a policy

Spawning a beacon is a core offensive capability that creates a new implant session within a specific process context. This constitutes arbitrary code execution and process injection in a red team (or adversarial) context. The blast radius is critical: an AI agent misusing this tool could deploy persistent remote access implants, enable lateral movement, exfiltrate data, and compromise entire environments.

From the tool's definition 'Spawn a beacon under a specific process' — spawning a Cobalt Strike beacon injects malicious implant code into a target process, triggering remote access and C2 operations

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

spawn_beacon_under Rate-limited

spawn_beacon_under 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_beacon_under": {
      "limits": [
        {
          "counter": "spawn_beacon_under_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_beacon_under

What does the spawn_beacon_under tool do? +

Spawn a beacon under a specific process. 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_beacon_under? +

Register the Cobalt Strike MCP Server MCP server in PolicyLayer and add a rule for spawn_beacon_under: 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_beacon_under? +

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

Can I rate-limit spawn_beacon_under? +

Yes. Add a rate_limit block to the spawn_beacon_under 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_beacon_under completely? +

Set action: deny in the PolicyLayer policy for spawn_beacon_under. 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_beacon_under? +

spawn_beacon_under 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.