Attempt to Mount SMB Share via Command Lineedit

Identifies the execution of macOS built-in commands to mount a Server Message Block (SMB) network share. Adversaries may use valid accounts to interact with a remote network share using SMB.

Rule type: eql

Rule indices:

  • auditbeat-*

Severity: low

Risk score: 21

Runs every: 5 minutes

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

Maximum alerts per execution: 100



  • Elastic
  • Host
  • macOS
  • Threat Detection
  • Lateral Movement

Version: 2 (version history)

Added (Elastic Stack release): 7.12.0

Last modified (Elastic Stack release): 8.2.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guideedit

## Config

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.

Rule queryedit

process where event.type in ("start", "process_started") and ( : "mount_smbfs" or ( : "open" and
process.args : "smb://*") or ( : "mount" and
process.args : "smbfs") or ( : "osascript" and
process.command_line : "osascript*mount volume*smb://*") )

Threat mappingedit


Rule version historyedit

Version 2 (8.2.0 release)
  • Formatting only