mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
80 lines
4.7 KiB
YAML
80 lines
4.7 KiB
YAML
name: Windows Devtunnels Execution
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id: b2630bb6-97df-405a-88b5-de6bb2c12cc3
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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 execution of Microsoft devtunnels.exe.
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Microsoft Devtunnels is a feature within Visual Studio that allows developers to expose their local development environment to the internet via secure, temporary tunnels, enabling external access for testing webhooks, APIs, and other services.
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While designed for legitimate development purposes, an attacker could exploit this feature to expose a compromised system or service to the internet, creating a covert communication channel that bypasses network security measures.
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By using Dev Tunnels, the attacker can establish a remote connection to the compromised environment, facilitate data exfiltration, or maintain command-and-control communications while avoiding detection by blending their activities with legitimate development traffic.
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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: |-
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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.original_file_name="devtunnel.dll"
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OR
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Processes.process_name="devtunnel.exe"
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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_devtunnels_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: Some legitimate developers may use Microsoft Devtunnels for testing and debugging their applications. Filter alerts for approved development environments and users.
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references:
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- https://blueteamops.medium.com/detecting-dev-tunnels-16f0994dc3e2
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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 Devtunnels 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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- Reverse Network Proxy
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asset_type: Endpoint
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mitre_attack_id:
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- T1090
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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/T1090/snapattack/snapattack.log
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source: XmlWinEventLog:Security
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sourcetype: XmlWinEventLog
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test_type: unit
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