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HighSigmaHQMicah Babinski (@micahbabinski) +1

External Remote SMB Logon from Public IP

Detects successful logon from public IP address via SMB. This can indicate a publicly-exposed SMB port.

Detection logic

Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source product
windows
Log source service
security

Known benign triggers

  • Legitimate or intentional inbound connections from public IP addresses on the SMB port.

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