spawn_beacon_asUser · Cobalt Strike MCP Server MCP

WHAT IT DOES

What spawn_beacon_asUser does on Cobalt Strike MCP Server

AI agents invoke spawn_beacon_asUser 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_asUser needs a policy

Spawning a beacon is an active execution operation that launches a remote-access implant (C2 agent) in the context of a target user. This is a core red-team lateral movement/privilege escalation action with critical blast radius: it grants persistent remote control, enables further compromise, and can be used for privilege escalation or credential theft.

From the tool's definition 'Spawn a beacon as a specific user' — spawns a Cobalt Strike beacon process under a specified user account

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

spawn_beacon_asUser Rate-limited

spawn_beacon_asUser 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_asUser": {
      "limits": [
        {
          "counter": "spawn_beacon_asuser_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_asUser

What does the spawn_beacon_asUser tool do? +

Spawn a beacon as a specific user. 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_asUser? +

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

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

Can I rate-limit spawn_beacon_asUser? +

Yes. Add a rate_limit block to the spawn_beacon_asUser 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_asUser completely? +

Set action: deny in the PolicyLayer policy for spawn_beacon_asUser. 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_asUser? +

spawn_beacon_asUser 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.