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MediumSigmaHQFlorian Roth (Nextron Systems) +2

Suspicious Rejected SMB Guest Logon From IP

Detect Attempt PrintNightmare (CVE-2021-1675) Remote code execution in Windows Spooler Service

Detection logic

Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

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

Log source product
windows
Log source service
smbclient_security

Known benign triggers

  • Account fallback reasons (after failed login with specific account)

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