Attempt to Mount SMB Share via Command Line

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Attempt to Mount SMB Share via Command Line

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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-*
  • logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: macOS
  • Use Case: Threat Detection
  • Tactic: Lateral Movement
  • Data Source: Elastic Defend

Version: 104

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where host.os.type == "macos" and event.type in ("start", "process_started") and
  (
    process.name : "mount_smbfs" or
    (process.name : "open" and process.args : "smb://*") or
    (process.name : "mount" and process.args : "smbfs") or
    (process.name : "osascript" and process.command_line : "osascript*mount volume*smb://*")
  ) and
  not process.parent.executable : "/Applications/Google Drive.app/Contents/MacOS/Google Drive"

Framework: MITRE ATT&CKTM