set_beacon_dns_mode · Cobalt Strike MCP Server MCP

WHAT IT DOES

What set_beacon_dns_mode does on Cobalt Strike MCP Server

AI agents invoke set_beacon_dns_mode 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 set_beacon_dns_mode needs a policy

Changing the DNS mode of a beacon alters how a compromised implant communicates with its C2 server. This is an operational configuration change that affects live red team (or adversarial) infrastructure. It triggers external behavior changes on the beacon and cannot be trivially reversed without additional commands, placing it in Execute.

From the tool's definition Set DNS mode for beacon — modifies the operational communication channel of a Cobalt Strike beacon

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_beacon_dns_mode Rate-limited

set_beacon_dns_mode 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": {
    "set_beacon_dns_mode": {
      "limits": [
        {
          "counter": "set_beacon_dns_mode_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 set_beacon_dns_mode

What does the set_beacon_dns_mode tool do? +

Set DNS mode for beacon. 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 set_beacon_dns_mode? +

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

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

Can I rate-limit set_beacon_dns_mode? +

Yes. Add a rate_limit block to the set_beacon_dns_mode 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 set_beacon_dns_mode completely? +

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

set_beacon_dns_mode 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.