Fsutil Drive Enumeration — Sigma Rule

Rule metadata and linked tags

Author: Christopher Peacock '@securepeacock', SCYTHE '@scythe_io'. Source status: test; severity: low. Source dates: 2022-03-29 / 2022-07-14.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3f4d9119c5c72efa28f23af210c6e9fbdacc66bf563ad07c7bb5c89de0de335a

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Fsutil Drive Enumeration
id: 63de06b9-a385-40b5-8b32-73f2b9ef84b6
status: test
description: Attackers may leverage fsutil to enumerated connected drives.
references:
    - Turla has used fsutil fsinfo drives to list connected drives.
    - https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/discovery_peripheral_device.toml
author: Christopher Peacock '@securepeacock', SCYTHE '@scythe_io'
date: 2022-03-29
modified: 2022-07-14
tags:
    - attack.discovery
    - attack.t1120
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\fsutil.exe'
        - OriginalFileName: 'fsutil.exe'
    selection_cli:
        CommandLine|contains: 'drives'
    condition: all of selection_*
falsepositives:
    - Certain software or administrative tasks may trigger false positives.
level: low

Original YAML and metadata in JSON

False positives

• Certain software or administrative tasks may trigger false positives.

Source references

• Turla has used fsutil fsinfo drives to list connected drives. (source note; no public URL supplied)
• https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/discovery_peripheral_device.toml