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https://github.com/splunk/security_content
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Eric McGinnis
81 lines
4.4 KiB
YAML
81 lines
4.4 KiB
YAML
name: Windows Crowdstrike RTR Script Execution
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id: be2bbfff-77c9-4d65-9b7c-97726051534a
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version: 2
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creation_date: '2021-05-07'
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modification_date: '2026-05-13'
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author: Raven Tait, Splunk
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status: production
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type: Anomaly
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description: |-
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Detects usage of Crowdstrike Real Time Response (RTR) to execute a "runscript" command.
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This can be used by malicious actors with access to the Crowdstrike Dashboard to execute commands on remote managed hosts.
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data_source:
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- Sysmon EventID 1
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- CrowdStrike ProcessRollup2
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search: |-
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| tstats `security_content_summariesonly`
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count min(_time) as firstTime
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max(_time) as lastTime
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from datamodel=Endpoint.Processes where
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Processes.parent_process_name="dllhost.exe"
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Processes.parent_process="*/Processid:{BD07DDB9-1C61-4DCE-9202-A2BA1757CDB2}*"
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Processes.process_name="powershell.exe"
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Processes.process="* -Version 5.1 -s -NoLogo -NoProfile -EncodedCommand*"
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by Processes.process Processes.vendor_product Processes.user_id Processes.process_hash
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Processes.parent_process_name Processes.parent_process_exec Processes.action
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Processes.dest Processes.process_current_directory Processes.process_path
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Processes.process_integrity_level Processes.original_file_name Processes.parent_process
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Processes.parent_process_path Processes.parent_process_guid Processes.parent_process_id
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Processes.process_guid Processes.process_id Processes.user Processes.process_name
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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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| `windows_crowdstrike_rtr_script_execution_filter`
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how_to_implement: The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process.
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known_false_positives: Legitimate Crowdstrike administrators may use RTR runscript commands for maintenance or troubleshooting. Filter alerts for trusted user activity and approved scripts.
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references:
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- https://cloud.google.com/blog/topics/threat-intelligence/unc3944-targets-saas-applications
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drilldown_searches:
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- earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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name: View the detection results for - "$user$" and "$dest$"
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search: '%original_detection_search% | search user = "$user$" dest = "$dest$"'
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- name: View risk events for the last 7 days for - "$user$" and "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$", "$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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intermediate_findings:
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entities:
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- field: dest
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type: system
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score: 20
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message: Potential CrowdStrike RTR script execution observed on $dest$ via $process$.
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threat_objects:
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- field: parent_process_name
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type: parent_process_name
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analytic_story:
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- Malicious PowerShell
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- Living Off The Land
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- Cobalt Strike
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- Suspicious MSHTA Activity
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.001
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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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category: endpoint
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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/snapattack/snapattack.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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test_type: unit
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