mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
75 lines
3.1 KiB
YAML
75 lines
3.1 KiB
YAML
name: Windows Powershell RemoteSigned File
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id: f7f7456b-470d-4a95-9703-698250645ff4
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version: 1
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date: '2023-06-16'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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data_source:
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- Sysmon Event ID 1
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description: This analytic identifies the use of "remotesigned" execution policy for
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a file. This security setting determines whether PowerShell scripts can be executed
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on a computer. When the execution policy is set to "remotesigned," it allows locally
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created scripts to run without any restrictions, but scripts downloaded from the
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internet must have a digital signature from a trusted publisher.
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search: '| tstats `security_content_summariesonly` min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where `process_powershell` Processes.process="*
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remotesigned *" Processes.process="* -File *" by Processes.dest Processes.user Processes.parent_process
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Processes.process_name Processes.original_file_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `windows_powershell_remotesigned_file_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: It is possible administrators or scripts may run these commands,
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filtering may be required.
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references:
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- https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/set-executionpolicy?view=powershell-7.3
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tags:
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analytic_story:
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- Amadey
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: A PowerShell commandline with remotesigned policy executed on $dest$
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mitre_attack_id:
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- T1059.001
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- T1059
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: user
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type: User
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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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risk_score: 25
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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
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- Processes.process_name
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- Processes.original_file_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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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/T1059.001/powershell_remotesigned/remotesigned_sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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