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https://github.com/splunk/security_content
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pyth0n1c
49 lines
2.3 KiB
YAML
49 lines
2.3 KiB
YAML
name: Get ADUser with PowerShell Script Block
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id: 21432e40-04f4-11ec-b7e6-acde48001122
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version: 6
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date: '2025-02-10'
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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
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cmdlet, which is used to enumerate all domain users. It leverages PowerShell Script
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Block Logging (EventCode=4104) to identify instances where this command is executed
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with a filter. This activity is significant as it may indicate an attempt by adversaries
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or Red Teams to gather information about domain users for situational awareness
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and Active Directory discovery. If confirmed malicious, this behavior could lead
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to further reconnaissance and potential exploitation of user accounts within the
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domain.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 ScriptBlockText = "*get-aduser*" ScriptBlockText
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= "*-filter*" | stats count min(_time) as firstTime max(_time) as lastTime by EventCode
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ScriptBlockText Computer UserID | rename Computer as dest, UserID as user| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `get_aduser_with_powershell_script_block_filter`'
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how_to_implement: The following Hunting analytic requires PowerShell operational logs
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to be imported. Modify the powershell macro as needed to match the sourcetype or
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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:
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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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