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https://github.com/splunk/security_content
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pyth0n1c
77 lines
3.8 KiB
YAML
77 lines
3.8 KiB
YAML
name: GetDomainComputer with PowerShell
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id: ed550c19-712e-43f6-bd19-6f58f61b3a5e
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version: 4
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date: '2024-11-13'
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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 `Get-DomainComputer` to discover remote systems.
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This detection leverages data from Endpoint Detection and Response (EDR) agents,
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focusing on process names and command-line executions. This activity is significant
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as `Get-DomainComputer` is part of PowerView, a tool often used by adversaries for
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domain enumeration and situational awareness. If confirmed malicious, this activity
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could allow attackers to map out the network, identify critical systems, and plan
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further attacks, 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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- 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=*Get-DomainComputer*) 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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| `getdomaincomputer_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 PowerView for troubleshooting.
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references:
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- https://attack.mitre.org/techniques/T1018/
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Remote system discovery enumeration on $dest$ by $user$
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risk_objects:
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- field: dest
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type: system
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score: 24
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threat_objects: []
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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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- T1018
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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:
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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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