mirror of
https://github.com/splunk/security_content
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Bhavin Patel
66 lines
2.6 KiB
YAML
66 lines
2.6 KiB
YAML
name: GetCurrent User with PowerShell Script Block
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id: 80879283-c30f-44f7-8471-d1381f6d437a
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version: 3
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date: '2024-05-21'
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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
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from the WindowsIdentity .NET class using PowerShell Script Block Logging (EventCode=4104).
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This method identifies the current Windows user. The detection leverages PowerShell
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script block logs to identify when this method is called. This activity is significant
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because adversaries and Red Teams may use it to gain situational awareness and perform
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Active Directory discovery on compromised endpoints. If confirmed malicious, this
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could allow attackers to map out user accounts and potentially escalate privileges
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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: '`powershell` EventCode=4104 ScriptBlockText = "*[System.Security.Principal.WindowsIdentity]*" ScriptBlockText
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= "*GetCurrent()*" | stats count min(_time) as firstTime max(_time) as lastTime
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by EventCode ScriptBlockText Computer UserID | rename Computer as dest, UserID as
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user | `security_content_ctime(firstTime)` | `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
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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-6.0&viewFallbackFrom=net-5.0
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tags:
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analytic_story:
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- Active Directory Discovery
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asset_type: Endpoint
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confidence: 50
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impact: 30
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message: System user discovery on $dest$ by $user$
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mitre_attack_id:
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- T1033
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observable:
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- name: dest
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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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- Message
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- OpCode
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- ComputerName
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- User
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- EventCode
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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:
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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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