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P4T12ICK
64 lines
2.3 KiB
YAML
64 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: 2
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date: '2022-09-13'
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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 utilizes PowerShell Script Block Logging (EventCode=4104)
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to identify the execution of the `Get-AdGUser` commandlet. The `Get-AdUser` commandlet
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is used to return a list of all domain users. Red Teams and adversaries may leverage
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this commandlet to enumerate domain groups for situational awareness and Active
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Directory Discovery.
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data_source:
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- Powershell 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 | `security_content_ctime(firstTime)` | `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
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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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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: powershell process having commandline $Message$ for user enumeration
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mitre_attack_id:
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- T1087.002
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- T1087
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observable:
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- name: ComputerName
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type: Hostname
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role:
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- Victim
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- name: User
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type: User
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role:
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- Victim
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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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required_fields:
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- _time
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- EventCode
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- Message
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- ComputerName
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- User
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risk_score: 25
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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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