# synscan\_internal\_internal **Explanation** The synscan\_internal\_internal NDM is designed to detect SYN scanning on internal networks. This NDM monitors for excessive SYN packets that can indicate malicious activity and flags any suspicious activity. **What to Look For** When examining the results of synscan\_internal\_internal, look for an unusually high number of SYN packets and no corresponding ACK packets. This indicates that an attacker may be attempting to perform a SYN flood attack. It is important to investigate the source of these packets, as well as the destination IP address. Any systems generating large numbers of SYN packets should be investigated to identify the potential attacker, while also monitoring network traffic for any further signs of malicious activity. **Related MITRE ATT\&CK Categories** [Discovery: Network Service Discovery, Technique T1046 - Enterprise](https://attack.mitre.org/techniques/T1046) --- # 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/reconnaissance/synscan_internal_internal.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.