Windows WebDAV User Agent — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2018-04-06 / 2021-11-27.

{
  "category": "proxy"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 88d4afc0bcd89fcf763299821f5d31fda677ddeeba1a3adfa9e16d21fc60b87c

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: Windows WebDAV User Agent
id: e09aed7a-09e0-4c9a-90dd-f0d52507347e
status: test
description: Detects WebDav DownloadCradle
references:
    - https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html
author: Florian Roth (Nextron Systems)
date: 2018-04-06
modified: 2021-11-27
tags:
    - attack.command-and-control
    - attack.t1071.001
logsource:
    category: proxy
detection:
    selection:
        c-useragent|startswith: 'Microsoft-WebDAV-MiniRedir/'
        cs-method: 'GET'
    condition: selection
falsepositives:
    - Administrative scripts that download files from the Internet
    - Administrative scripts that retrieve certain website contents
    - Legitimate WebDAV administration
level: high

Original YAML and metadata in JSON

False positives

• Administrative scripts that download files from the Internet
• Administrative scripts that retrieve certain website contents
• Legitimate WebDAV administration

Source references

• https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html