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https://github.com/splunk/security_content
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pyth0n1c
72 lines
3.3 KiB
YAML
72 lines
3.3 KiB
YAML
name: Get DomainUser with PowerShell Script Block
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id: 61994268-04f4-11ec-865c-acde48001122
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version: 7
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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: TTP
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description: The following analytic detects the execution of the `Get-DomainUser`
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cmdlet using PowerShell Script Block Logging (EventCode=4104). This cmdlet is part
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of PowerView, a tool often used for domain enumeration. The detection leverages
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PowerShell operational logs to identify instances where this command is executed.
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Monitoring this activity is crucial as it may indicate an adversary's attempt to
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gather information about domain users, which is a common step in Active Directory
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Discovery. If confirmed malicious, this activity could lead to further reconnaissance
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and potential exploitation of domain resources.
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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-DomainUser*" | stats
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count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
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Computer UserID | rename Computer as dest, UserID as user| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `get_domainuser_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://powersploit.readthedocs.io/en/latest/Recon/Get-DomainUser/
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drilldown_searches:
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- name: View the detection results for - "$dest$" and "$user$"
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search: '%original_detection_search% | search dest = "$dest$" user = "$user$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$" and "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$",
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"$user$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Powershell process having commandline "*Get-DomainUser*" for user enumeration
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on $dest$
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risk_objects:
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- field: dest
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type: system
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score: 25
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- field: user
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type: user
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score: 25
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threat_objects: []
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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/windows-powershell-xml.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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