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Nasreddine Bencherchali
11c909f725
* Add YAML formatting and validation infrastructure - Add yamlfmt configuration (.yamlfmt) with 4-space indent, LF line endings - Add yamllint configuration (.yamllint) for syntax validation (detections/ only) - Add pre-commit hook for automatic YAML formatting - Add CI validation script with unified error output - Add GitHub Actions workflow for PR validation - Add documentation for setup and usage - Support custom yamlfmt binary path via --yamlfmt-path flag * comment yaml check from pre-commit * apply yamlfmt * Update yaml-validation.yml * Update yaml-validation.yml * application folder search formatting * cloud folder search formatting * web folder search formatting * network folder search formatting * endpoint folder search formatting * resolve first conflict * apply formatting * remove additional pipe * Update README.md * update versions * restore and update formatting (#3920) --------- Co-authored-by: Bhavin Patel <bhavin.j.patel91@gmail.com>
47 lines
2.5 KiB
YAML
47 lines
2.5 KiB
YAML
name: Get ADUser with PowerShell Script Block
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id: 21432e40-04f4-11ec-b7e6-acde48001122
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version: 9
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date: '2026-02-25'
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author: Teoderick Contreras, Mauricio Velazco, Splunk
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status: production
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type: Hunting
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description: The following analytic detects the execution of the `Get-AdUser` PowerShell cmdlet, which is used to enumerate all domain users. It leverages PowerShell Script Block Logging (EventCode=4104) to identify instances where this command is executed with a filter. This activity is significant as it may indicate an attempt by adversaries or Red Teams to gather information about domain users for situational awareness and Active Directory discovery. If confirmed malicious, this behavior could lead to further reconnaissance and potential exploitation of user accounts within the domain.
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data_source:
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- Powershell Script Block Logging 4104
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search: |-
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`powershell` EventCode=4104 ScriptBlockText = "*get-aduser*" ScriptBlockText = "*-filter*"
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY dest signature signature_id
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user_id vendor_product EventID
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Guid Opcode Name
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Path ProcessID ScriptBlockId
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ScriptBlockText
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `get_aduser_with_powershell_script_block_filter`
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how_to_implement: The following Hunting analytic requires PowerShell operational logs to be imported. Modify the powershell macro as needed to match the sourcetype or add index. This analytic is specific to 4104, or PowerShell Script Block Logging.
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known_false_positives: Administrators or power users may use this command for troubleshooting.
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references:
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- https://www.blackhillsinfosec.com/red-blue-purple/
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- https://attack.mitre.org/techniques/T1087/002/
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- https://docs.microsoft.com/en-us/powershell/module/activedirectory/get-aduser?view=windowsserver2019-ps
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tags:
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analytic_story:
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- Active Directory Discovery
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- CISA AA23-347A
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asset_type: Endpoint
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mitre_attack_id:
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- T1087.002
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1087.002/AD_discovery/aduser_powershell.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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