mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
71 lines
3.9 KiB
YAML
71 lines
3.9 KiB
YAML
name: Windows Level RMM PowerShell Script Installer
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id: 1abf472a-88c9-41bb-9002-3272037531b7
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version: 2
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creation_date: '2026-05-05'
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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 the PowerShell installer for the Level tool.
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Level is a commercial remote management tool from Level.io.
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Remote management tools, when used for legitimate purposes, can help IT professionals and system administrators remotely access and manage computer systems.
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However, threat actors may exploit these tools for malicious purposes.
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It can be used to maintain persistence and execution on a host by a malicious actor.
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data_source:
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- Powershell Script Block Logging 4104
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search: |-
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`powershell`
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EventID="4104"
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ScriptBlockText IN (
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"*$env:LEVEL_API_KEY *",
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"*https://downloads.level.io/install_windows.ps1*"
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)
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| fillnull
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| stats count min(_time) as firstTime
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max(_time) as lastTime
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by Computer EventID ScriptBlockText signature signature_id user_id vendor_product Guid
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Opcode Name Path ProcessID ScriptBlockId
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| rename Computer as dest
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `windows_level_rmm_powershell_script_installer_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 IT and system administrators may use the Level PowerShell installer for remote management and maintenance. Filter alerts for authorized use within managed environments.
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references:
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- https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-320a
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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 Level PowerShell installer activity observed on $dest$ via script block $ScriptBlockId$.
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analytic_story:
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- Remote Monitoring and Management Software
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asset_type: Endpoint
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mitre_attack_id:
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- T1219
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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/T1219/snapattack/snapattack.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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test_type: unit
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