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mhaag-spl
64 lines
2.4 KiB
YAML
64 lines
2.4 KiB
YAML
name: GetCurrent User with PowerShell Script Block
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id: 80879283-c30f-44f7-8471-d1381f6d437a
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version: 2
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date: '2022-02-25'
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author: Mauricio Velazco, Splunk
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type: Hunting
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datamodel: []
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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 `GetCurrent` method of the WindowsIdentity .NET
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class. This method returns an object that represents the current Windows user. Red
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Teams and adversaries may leverage this method to identify the logged user on a
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compromised endpoint for situational awareness and Active Directory Discovery.
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search: '`powershell` EventCode=4104 (ScriptBlockText = "*[System.Security.Principal.WindowsIdentity]*"
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AND ScriptBlockText = "*GetCurrent()*") | stats count min(_time) as firstTime max(_time)
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as lastTime by EventCode ScriptBlockText Opcode Computer UserID | `security_content_ctime(firstTime)`
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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
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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/T1033/
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- https://docs.microsoft.com/en-us/dotnet/api/system.security.principal.windowsidentity.getcurrent?view=net-5.0
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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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automated_detection_testing: passed
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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Discovery
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- Stage:Recon
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1033/AD_discovery/windows-powershell.log
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impact: 30
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kill_chain_phases:
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- Reconnaissance
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message: System user discovery on $Computer$
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mitre_attack_id:
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- T1033
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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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- Path
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- ScriptBlockText
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- Opcode
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- Computer
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- UserID
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- EventCode
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risk_score: 15
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security_domain: endpoint
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