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https://github.com/splunk/security_content
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P4T12ICK
66 lines
2.6 KiB
YAML
66 lines
2.6 KiB
YAML
name: GetCurrent User with PowerShell
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id: 7eb9c3d5-c98c-4088-acc5-8240bad15379
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version: 1
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date: '2021-09-13'
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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: This analytic looks for the execution of `powerhsell.exe` with command-line
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arguments that execute the `GetCurrent` method of the WindowsIdentity .NET class.
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This method returns an object that represents the current Windows user. Red Teams
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and adversaries may leverage this method to identify the logged user on a compromised
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endpoint for situational awareness and Active Directory Discovery.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="powershell.exe")
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(Processes.process=*System.Security.Principal.WindowsIdentity* OR Processes.process=*GetCurrent()*)
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by Processes.dest Processes.user Processes.parent_process Processes.process_name
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Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `getcurrent_user_with_powershell_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node.
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known_false_positives: Administrators or power users may use this command for troubleshooting.
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references:
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- https://attack.mitre.org/techniques/T1033/
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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 $dest$
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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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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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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/T1033/AD_discovery/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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