Enumeration of Users or Groups via Built-in Commands

Identifies the execution of macOS built-in commands related to account or group enumeration. Adversaries may use account and group information to orient themselves before deciding how to act.

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: None

Tags:

Elastic
Host
macOS
Threat Detection
Discovery

Version: 6

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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## Setup

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 query

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process where event.type in ("start", "process_started") and
  (
    process.name : ("ldapsearch", "dsmemberutil") or
    (process.name : "dscl" and
      process.args : ("read", "-read", "list", "-list", "ls", "search", "-search") and
      process.args : ("/Active Directory/*", "/Users*", "/Groups*"))
	) and
  not process.parent.executable : ("/Applications/NoMAD.app/Contents/MacOS/NoMAD",
     "/Applications/ZoomPresence.app/Contents/MacOS/ZoomPresence",
     "/Applications/Sourcetree.app/Contents/MacOS/Sourcetree",
     "/Library/Application Support/JAMF/Jamf.app/Contents/MacOS/JamfDaemon.app/Contents/MacOS/JamfDaemon",
     "/Applications/Jamf Connect.app/Contents/MacOS/Jamf Connect",
     "/usr/local/jamf/bin/jamf",
     "/Library/Application Support/AirWatch/hubd",
     "/opt/jc/bin/jumpcloud-agent",
     "/Applications/ESET Endpoint Antivirus.app/Contents/MacOS/esets_daemon",
     "/Applications/ESET Endpoint Security.app/Contents/MacOS/esets_daemon",
     "/Library/PrivilegedHelperTools/com.fortinet.forticlient.uninstall_helper"
    )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Permission Groups Discovery
- ID: T1069
- Reference URL: https://attack.mitre.org/techniques/T1069/
Technique:
- Name: Account Discovery
- ID: T1087
- Reference URL: https://attack.mitre.org/techniques/T1087/

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