MediumSigmaHQ Mohamed Abdelghani

Unsigned or Unencrypted SMB Connection to Share Established

Detects SMB server connections to shares without signing or encryption enabled. This could indicate potential lateral movement activity using unsecured SMB shares.

Detection logic

Detection requirements

Platform: Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: windows
Log source service: smbserver_connectivity

Known benign triggers

Connections from local or private IP addresses to SMB shares without signing or encryption enabled for older systems or misconfigured environments. Apply additional tuning as needed.

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
learn.microsoft.com/en-us/troubleshoot/windows-server/networking/overview-server-message-block-signing	Product documentation	Only this detection cites it

Detection rules

Unsigned or Unencrypted SMB Connection to Share Established

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules