Potentially Suspicious WebDAV LNK Execution — Sigma Rule

Rule metadata and linked tags

Author: Micah Babinski. Source status: test; severity: medium. Source dates: 2023-08-21 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: e97f446f4d8a7cfd3f4062c929e8e9db528618004c479f4eb6bca3cc54848473

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: Potentially Suspicious WebDAV LNK Execution
id: 1412aa78-a24c-4abd-83df-767dfb2c5bbe
related:
    - id: f0507c0f-a3a2-40f5-acc6-7f543c334993
      type: similar
status: test
description: Detects possible execution via LNK file accessed on a WebDAV server.
references:
    - https://www.trellix.com/en-us/about/newsroom/stories/research/beyond-file-search-a-novel-method.html
    - https://micahbabinski.medium.com/search-ms-webdav-and-chill-99c5b23ac462
author: Micah Babinski
date: 2023-08-21
tags:
    - attack.execution
    - attack.t1059.001
    - attack.t1204
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\explorer.exe'
        Image|endswith:
            - '\cmd.exe'
            - '\cscript.exe'
            - '\mshta.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\wscript.exe'
        CommandLine|contains: '\DavWWWRoot\'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.trellix.com/en-us/about/newsroom/stories/research/beyond-file-search-a-novel-method.html
• https://micahbabinski.medium.com/search-ms-webdav-and-chill-99c5b23ac462