> 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/attack/tor_connection_external_internal.md).

# tor\_connection\_external\_internal

**Explanation**

This event is triggered by Netography’s Fusion Portal when it detects traffic originating from a TOR network exit node communicating with monitored hosts. Traffic from the TOR network is not inherently malicious; however, attackers will commonly use the TOR network to hide the origin of other attacks. These attacks might include: password brute forcing, host or vulnerability discovery (scanning), or data exfiltration.

**What to Look For**

Scanning activity from the Internet is very common, and this event is not necessarily concerning or even malicious. Some things to investigate include: traffic to hosts not expected to be reachable from the Internet, lots of requests to a single host, a large volume of data leaving a single host.

**Related MITRE ATT\&CK Categories**

[Command and Control: Proxy, Technique T1090 - Enterprise](https://attack.mitre.org/techniques/T1090)


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