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103 lines
3.6 KiB
Markdown
103 lines
3.6 KiB
Markdown
---
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title: "GetAdComputer with PowerShell"
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excerpt: "Remote System Discovery"
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categories:
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- Endpoint
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last_modified_at: 2021-09-07
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toc: true
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toc_label: ""
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tags:
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- Remote System Discovery
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- Discovery
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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- Endpoint
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---
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[Try in Splunk Security Cloud](https://www.splunk.com/en_us/cyber-security.html){: .btn .btn--success}
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#### Description
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This analytic looks for the execution of `powershell.exe` with command-line arguments utilized to discover remote systems. The `Get-AdComputer' commandlet returns a list of all domain computers. Red Teams and adversaries alike may use this commandlet to identify remote systems for situational awareness and Active Directory Discovery.
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- **Type**: Hunting
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- **Product**: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
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- **Datamodel**: [Endpoint](https://docs.splunk.com/Documentation/CIM/latest/User/Endpoint)
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- **Last Updated**: 2021-09-07
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- **Author**: Mauricio Velazco, Splunk
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- **ID**: c5a31f80-5888-4d81-9f78-1cc65026316e
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#### [ATT&CK](https://attack.mitre.org/)
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| ID | Technique | Tactic |
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| ----------- | ----------- |--------------- |
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| [T1018](https://attack.mitre.org/techniques/T1018/) | Remote System Discovery | Discovery |
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#### Search
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```
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| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="powershell.exe") (Processes.process=*Get-AdComputer*) by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `getadcomputer_with_powershell_filter`
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```
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#### Associated Analytic Story
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* [Active Directory Discovery](/stories/active_directory_discovery)
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#### How To Implement
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To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node.
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#### Required field
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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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#### Kill Chain Phase
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* Reconnaissance
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#### Known False Positives
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Administrators or power users may use this command for troubleshooting.
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#### RBA
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| Risk Score | Impact | Confidence | Message |
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| ----------- | ----------- |--------------|--------------|
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| 15.0 | 30 | 50 | Remote system discovery enumeration on $dest$ by $user$ |
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#### Reference
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* [https://attack.mitre.org/techniques/T1018/](https://attack.mitre.org/techniques/T1018/)
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#### Test Dataset
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Replay any dataset to Splunk Enterprise by using our [`replay.py`](https://github.com/splunk/attack_data#using-replaypy) tool or the [UI](https://github.com/splunk/attack_data#using-ui).
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Alternatively you can replay a dataset into a [Splunk Attack Range](https://github.com/splunk/attack_range#replay-dumps-into-attack-range-splunk-server)
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* [https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1018/AD_discovery/windows-sysmon.log](https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1018/AD_discovery/windows-sysmon.log)
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[*source*](https://github.com/splunk/security_content/tree/develop/detections/endpoint/getadcomputer_with_powershell.yml) \| *version*: **1** |