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https://github.com/splunk/security_content
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ljstella
53 lines
2.5 KiB
YAML
53 lines
2.5 KiB
YAML
name: GetLocalUser with PowerShell Script Block
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id: 2e891cbe-0426-11ec-9c9c-acde48001122
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version: 9
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date: '2025-06-24'
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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:
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The following analytic detects the execution of the `Get-LocalUser` PowerShell
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commandlet using PowerShell Script Block Logging (EventCode=4104). This commandlet
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lists all local users on a system. The detection leverages script block text from
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PowerShell logs to identify this activity. Monitoring this behavior is significant
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as adversaries and Red Teams may use it to enumerate local users for situational
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awareness and Active Directory discovery. If confirmed malicious, this activity
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could lead to further reconnaissance, enabling attackers to identify potential targets
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for privilege escalation or lateral movement.
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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 = "*Get-LocalUser*") | fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime by dest signature signature_id
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user_id vendor_product EventID Guid Opcode Name Path ProcessID ScriptBlockId ScriptBlockText
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `getlocaluser_with_powershell_script_block_filter`'
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how_to_implement:
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To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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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:
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Administrators or power users may use this PowerShell commandlet
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for troubleshooting.
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references:
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- https://attack.mitre.org/techniques/T1087/001/
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- https://www.splunk.com/en_us/blog/security/hunting-for-malicious-powershell-using-script-block-logging.html
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tags:
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analytic_story:
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- Active Directory Discovery
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- Malicious PowerShell
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.001
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- T1087.001
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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: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1087.001/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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