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Enumeration of Users or Groups via Built-in Commands

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Enumeration of Users or Groups via Built-in Commands

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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: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
macOS
Threat Detection
Discovery

Version: 100 (version history)

Added (Elastic Stack release): 7.12.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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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/Pri
vilegedHelperTools/com.fortinet.forticlient.uninstall_helper" )

Threat mapping

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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/

Rule version history

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Version 100 (8.5.0 release)

Formatting only

Version 5 (8.4.0 release)

Updated query, changed from:

process where event.type in ("start", "process_started") 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" ) 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*"))

Version 3 (8.2.0 release)

Updated query, changed from:

process where event.type in ("start", "process_started") 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", "/usr/local/jamf/bin/jamf" )
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*"))

Version 2 (7.13.0 release)

Updated query, changed from:

process where event.type in ("start", "process_started") and not
process.parent.executable :
("/Applications/NoMAD.app/Contents/MacOS/NoMAD",
"/Applications/ZoomPresence.app/Contents/MacOS/ZoomPresence") 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*"))

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