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P4T12ICK
62 lines
2.3 KiB
YAML
62 lines
2.3 KiB
YAML
name: GetLocalUser with PowerShell Script Block
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id: 2e891cbe-0426-11ec-9c9c-acde48001122
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version: 2
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date: '2022-03-22'
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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 utilizes PowerShell Script Block Logging (EventCode=4104)
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to identify the execution of the `Get-LocalUser` commandlet. The `Get-LocalUser`
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commandlet is used to return a list of all local users. Red Teams and adversaries
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may leverage this commandlet to enumerate users 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-LocalUser*") | stats
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count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
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Computer user_id | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `getlocaluser_with_powershell_script_block_filter`'
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how_to_implement: 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://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: 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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confidence: 50
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impact: 30
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message: Local user discovery enumeration using PowerShell on $Computer$ by $user$
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mitre_attack_id:
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- T1087
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- T1087.001
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- T1059.001
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observable:
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- name: Computer
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type: Endpoint
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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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- ScriptBlockText
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- Computer
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- UserID
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risk_score: 15
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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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