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https://github.com/splunk/security_content
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Eric
59 lines
3.2 KiB
YAML
59 lines
3.2 KiB
YAML
name: GetCurrent User with PowerShell
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id: 7eb9c3d5-c98c-4088-acc5-8240bad15379
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version: 6
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date: '2025-05-02'
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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 `powershell.exe` with
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command-line arguments invoking the `GetCurrent` method of the WindowsIdentity .NET
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class. This detection leverages data from Endpoint Detection and Response (EDR)
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agents, focusing on process names and command-line executions. This activity is
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significant as adversaries may use this method to identify the logged-in user on
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a compromised endpoint, aiding in situational awareness and Active Directory discovery.
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If confirmed malicious, this could allow attackers to gain insights into user context,
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potentially facilitating further exploitation and lateral movement within the network.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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- CrowdStrike ProcessRollup2
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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.action Processes.dest Processes.original_file_name Processes.parent_process
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Processes.parent_process_exec Processes.parent_process_guid Processes.parent_process_id
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Processes.parent_process_name Processes.parent_process_path Processes.process Processes.process_exec
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Processes.process_guid Processes.process_hash Processes.process_id Processes.process_integrity_level
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Processes.process_name Processes.process_path Processes.user Processes.user_id Processes.vendor_product
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `getcurrent_user_with_powershell_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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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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mitre_attack_id:
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- T1033
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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/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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