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MediumSigmaHQNVISO

Failed Logon From Public IP

Detects a failed logon attempt from a public IP. A login from a public IP can indicate a misconfigured firewall or network boundary.

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

  • IPv4-to-IPv6 mapped IPs
  • Legitimate logon attempts over the internet

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