mirror of
https://github.com/splunk/security_content
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Bhavin Patel
77 lines
3.4 KiB
YAML
77 lines
3.4 KiB
YAML
name: GetWmiObject Ds Computer with PowerShell
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id: 7141122c-3bc2-4aaa-ab3b-7a85a0bbefc3
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version: 2
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date: '2024-05-27'
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author: Mauricio Velazco, Splunk
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status: production
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type: TTP
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description: The following analytic detects the execution of `powershell.exe` with
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command-line arguments that utilize the `Get-WmiObject` cmdlet to discover remote
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systems, specifically targeting the `DS_Computer` parameter. This detection leverages
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data from Endpoint Detection and Response (EDR) agents, focusing on process names
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and command-line executions. This activity is significant as it indicates potential
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reconnaissance efforts by adversaries to enumerate domain computers and gather situational
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awareness within Active Directory. If confirmed malicious, this behavior could allow
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attackers to map the network, identify critical systems, and plan further attacks,
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potentially leading to unauthorized access and data exfiltration.
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data_source:
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- Sysmon EventID 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=*Get-WmiObject* AND Processes.process="*namespace root\\directory\\ldap*"
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AND Processes.process="*class ds_computer*") by Processes.dest Processes.user Processes.parent_process
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `getwmiobject_ds_computer_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/T1018/
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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: 70
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impact: 30
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message: Remote system discovery enumeration using WMI on $dest$ by $user$
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mitre_attack_id:
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- T1018
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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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- 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: 21
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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/T1018/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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