Name:Detect USB device insertion id:104658f4-afdc-499f-9719-17a43f9826f5 version:3 date:2024-10-17 author:Bhavin Patel, Splunk status:deprecated type:TTP Description:The search is used to detect hosts that generate Windows Event ID 4663 for successful attempts to write to or read from a removable storage and Event ID 4656 for failures, which occurs when a USB drive is plugged in. In this scenario we are querying the Change_Analysis data model to look for Windows Event ID 4656 or 4663 where the priority of the affected host is marked as high in the ES Assets and Identity Framework. Data_source:
search:| tstats `security_content_summariesonly` count earliest(_time) AS earliest latest(_time) AS latest from datamodel=Change_Analysis where (nodename = All_Changes) All_Changes.result="Removable Storage device" (All_Changes.result_id=4663 OR All_Changes.result_id=4656) (All_Changes.src_priority=high) by All_Changes.dest | `drop_dm_object_name("All_Changes")`| `security_content_ctime(earliest)`| `security_content_ctime(latest)` | `detect_usb_device_insertion_filter`
how_to_implement:To successfully implement this search, you must ingest Windows Security Event logs and track event code 4663 and 4656. Ensure that the field from the event logs is being mapped to the result_id field in the Change_Analysis data model. To minimize the alert volume, this search leverages the Assets and Identity framework to filter out events from those assets not marked high priority in the Enterprise Security Assets and Identity Framework. known_false_positives:Legitimate USB activity will also be detected. Please verify and investigate as appropriate. References: drilldown_searches:
: tags: analytic_story: - 'Data Protection' asset_type:Endpoint confidence:50 impact:50 message:tbd observable: name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'All_Changes.result' - 'All_Changes.result_id' - 'All_Changes.src_priority' - 'All_Changes.dest' risk_score:25 security_domain:endpoint
