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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&CK^TM

Tactic:
- Name: Lateral Movement
- ID: TA0008
- Reference URL: https://attack.mitre.org/tactics/TA0008/
Technique:
- Name: Remote Services
- ID: T1021
- Reference URL: https://attack.mitre.org/techniques/T1021/
Sub-technique:
- Name: SMB/Windows Admin Shares
- ID: T1021.002
- Reference URL: https://attack.mitre.org/techniques/T1021/002/

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