> For the complete documentation index, see [llms.txt](https://docs.fusion.vectra.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fusion.vectra.ai/detection-models/library/reconnaissance/synscan_internal_internal.md).

# 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)


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