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InformationalSplunk security contentSteven Dick

Windows USBSTOR Registry Key Modification

This analytic is used to identify when a USB removable media device is attached to a Windows host. In this scenario we are querying the Endpoint Registry data model to look for modifications to the…

Description

This analytic is used to identify when a USB removable media device is attached to a Windows host. In this scenario we are querying the Endpoint Registry data model to look for modifications to the HKLM\System\CurrentControlSet\Enum\USBSTOR\ key. Adversaries and Insider Threats may use removable media devices for several malicious activities, including initial access, execution, and exfiltration.

Detection logic

Detection requirements

Platform
LinuxmacOSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source category
sysmon_eventid_12sysmon_eventid_13

Known benign triggers

  • Legitimate USB activity will also be detected. Please verify and investigate as appropriate.

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