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https://github.com/splunk/security_content
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Eric McGinnis
47 lines
2.7 KiB
YAML
47 lines
2.7 KiB
YAML
name: GetCurrent User with PowerShell Script Block
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id: 80879283-c30f-44f7-8471-d1381f6d437a
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version: 10
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creation_date: '2021-08-24'
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modification_date: '2026-05-13'
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author: 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 `GetCurrent` method from the WindowsIdentity .NET class using PowerShell Script Block Logging (EventCode=4104). This method identifies the current Windows user. The detection leverages PowerShell script block logs to identify when this method is called. This activity is significant because adversaries and Red Teams may use it to gain situational awareness and perform Active Directory discovery on compromised endpoints. If confirmed malicious, this could allow attackers to map out user accounts and potentially escalate privileges or move laterally within the network.
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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 = "*[System.Security.Principal.WindowsIdentity]*" ScriptBlockText = "*GetCurrent()*"
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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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| `getcurrent_user_with_powershell_script_block_filter`
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how_to_implement: To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://help.splunk.com/en/security-offerings/splunk-user-behavior-analytics/get-data-in/5.4.1/add-other-data-to-splunk-uba/configure-powershell-logging-to-see-powershell-anomalies-in-splunk-uba.
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known_false_positives: Administrators or power users may use this PowerShell commandlet for troubleshooting.
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references:
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- https://attack.mitre.org/techniques/T1033/
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- https://docs.microsoft.com/en-us/dotnet/api/system.security.principal.windowsidentity.getcurrent?view=net-6.0&viewFallbackFrom=net-5.0
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analytic_story:
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- Active Directory Discovery
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asset_type: Endpoint
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mitre_attack_id:
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- T1033
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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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category: endpoint
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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/T1033/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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test_type: unit
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