Direct Outbound SMB Connectionedit

Identifies unexpected processes making network connections over port 445. Windows File Sharing is typically implemented over Server Message Block (SMB), which communicates between hosts using port 445. When legitimate, these network connections are established by the kernel. Processes making 445/tcp connections may be port scanners, exploits, or suspicious user-level processes moving laterally.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None


  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Lateral Movement

Version: 7

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule queryedit

sequence by process.entity_id
  [process where event.type == "start" and != 4]
  [network where destination.port == 445 and != 4 and
     not cidrmatch(destination.ip, "", "::1")]