mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
86 lines
3.6 KiB
YAML
86 lines
3.6 KiB
YAML
name: Get ADUser with PowerShell
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id: 0b6ee3f4-04e3-11ec-a87d-acde48001122
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version: 2
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date: '2024-05-21'
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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 `powershell.exe` with
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command-line arguments used to enumerate domain users via the `Get-ADUser` cmdlet.
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It leverages data from Endpoint Detection and Response (EDR) agents, focusing on
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process names and command-line executions. This activity is significant as it may
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indicate an attempt by adversaries to gather information about domain users for
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situational awareness and Active Directory discovery. If confirmed malicious, this
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behavior could lead to further reconnaissance, enabling attackers to identify high-value
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targets and plan subsequent attacks.
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data_source:
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- Sysmon EventID 1
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="cmd.exe"
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OR Processes.process_name="powershell*") AND Processes.process = "*Get-ADUser*"
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AND Processes.process = "*-filter*" by Processes.dest Processes.user Processes.parent_process
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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Processes.parent_process_name | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `get_aduser_with_powershell_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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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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confidence: 50
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impact: 50
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message: an instance of process $process_name$ with commandline $process$ in $dest$
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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: user
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type: User
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role:
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- Victim
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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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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- Processes.dest
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- Processes.user
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- Processes.parent_process
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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- Processes.parent_process_name
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1087.002/AD_discovery/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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