> 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/misconfiguration/external_access_of_smb.md). # external\_access\_of\_smb Explanation This security event is triggered by the Netography Fusion Portal when it detects non-customer network access to Windows Networking (Including DCE-RPC, Netbios, or SMB). What to Look For Ge **Explanation** This security event is triggered by the Netography Fusion Portal when it detects non-customer network access to Windows Networking (Including DCE-RPC, Netbios, or SMB). **What to Look For** Generally, Windows Networking should not be exposed to the Internet and unauthorized external access can indicate a potential security threat. If a Windows server or workstation has been exposed, the host in question may have been compromised, or files may have been exfiltrated from file sharing services. Network administrators should consider implementing additional security protocols to limit access to these hosts, such as firewalls, or disabling SMB services altogether. This event may false positive if internal IP address ranges have not been defined properly in Netography Fusion. **Related MITRE ATT\&CK Categories** [Discovery: Network Service Discovery, Technique T1046 - Enterprise](https://attack.mitre.org/techniques/T1046) [Exfiltration: Exfiltration Over Alternative Protocol, Technique T1048 - Enterprise](https://attack.mitre.org/techniques/T1048) [Initial Access, Persistence: External Remote Services, Technique T1133 - Enterprise](https://attack.mitre.org/techniques/T1133) [Discovery: Network Share Discovery, Technique T1135 - Enterprise](https://attack.mitre.org/techniques/T1135) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.fusion.vectra.ai/detection-models/library/misconfiguration/external_access_of_smb.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.