# internal\_tcp\_4444 **Explanation** The internal\_tcp\_4444 NDM flags connections on TCP port 4444 inside your network. Metasploit uses port 4444 by default for shell listeners that are setup after exploitation, so the use of this port could indicate successful exploitation of a remote code execution vulnerability in a running service on the source host. **What to Look For** Traffic to this port could be innocuous, particularly in cases where communications protocols dynamically assign ports. Verify that the server (the source IP in this case) is not compromised, and that it is expected to receive connections on port 4444. **Related MITRE ATT\&CK Categories** [Lateral Movement: Exploitation of Remote Services, Technique T1210 - Enterprise](https://attack.mitre.org/techniques/T1210) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.fusion.vectra.ai/detection-models/library/attack/internal_tcp_4444.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.