# fin\_flood **Explanation** Fin Flood is a type of Denial-of-Service (DoS) attack that targets an open connection by bombarding it with numerous TCP packets with the "FIN" flag set. This excessive amount of packets overwhelms the system and can cause the connection to crash or become unresponsive. **What to Look For** When reviewing results for fin\_flood, look for a high volume of TCP packets with the "FIN" flag set. Pay attention to the source IP addresses, destination IP addresses, and ports being targeted. Check whether this activity is occurring across multiple devices on the network or if it is isolated to a particular device. Investigate any anomalies in network traffic patterns and monitor for ongoing attacks. Implement measures to mitigate against DoS attacks, which could include filtering or limiting traffic from suspicious IPs and network segments. **Related MITRE ATT\&CK Categories** [Impact: Network Denial of Service, Technique T1498 - Enterprise](https://attack.mitre.org/techniques/T1498) [Impact: Endpoint Denial of Service, Technique T1499 - Enterprise](https://attack.mitre.org/techniques/T1499) --- # 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/denial-of-service/fin_flood.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.