Lateral Movement via SMB Connection Spikes
This rule detects potential lateral movement activity by identifying devices that establish connections to three or more distinct remote IP addresses via SMB/CIFS ports (445 or 139) within a one-hour window. The query excludes internal network ranges (10.x.x.x and 192.168.x.x) to focus on connections that may be traversing network boundaries or reaching out to segments that might indicate unauthorized discovery or movement.
Microsoft Sentinel (KQL)
