Windows Proxy Activity Using Microsoft-WebDAV-MiniRedir GET User-Agent

Alerts on proxy HTTP GET requests using the Microsoft-WebDAV-MiniRedir/ User-Agent prefix associated with file download behavior.

FreeReviewedSigma · High · v2

Category: proxy
Author: Florian Roth (Nextron Systems) (SigmaHQ), DRL 1.1
Published: 2018-04-06
Updated: 2026-07-31

Analysis Detection

ATT&CK techniques

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1071.001Web Protocols
Exfiltration
Impact

What it detects

This rule flags proxy traffic where the HTTP method is GET and the User-Agent starts with Microsoft-WebDAV-MiniRedir/, indicating WebDAV-style download behavior. Attackers commonly use WebDAV interfaces to stage or retrieve payloads from remote servers, so this User-Agent pattern can be a high-signal indicator of command-and-control activity. The detection relies on proxy logs capturing HTTP method and User-Agent fields.

Reporting behind it

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Windows Proxy Activity Using Microsoft-WebDAV-MiniRedir GET User-Agent

Pivot detection · T1071.001 · 9 related

Changelog

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-webdav-downloader-activity-via-proxy-user-agent-and-http-get-e09aed7a

title: Windows Proxy Activity Using Microsoft-WebDAV-MiniRedir GET User-Agent
id: 9bc33e11-50ed-46de-8a3d-d1e61af1f092
status: test
description: This rule flags proxy traffic where the HTTP method is GET and the User-Agent starts with Microsoft-WebDAV-MiniRedir/, indicating WebDAV-style download behavior. Attackers commonly use WebDAV interfaces to stage or retrieve payloads from remote servers, so this User-Agent pattern can be a high-signal indicator of command-and-control activity. The detection relies on proxy logs capturing HTTP method and User-Agent fields.
references:
  - https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html
  - https://github.com/SigmaHQ/sigma/blob/master/rules/web/proxy_generic/proxy_downloadcradle_webdav.yml
author: Florian Roth (Nextron Systems), Huntrule Team
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
license: DRL-1.1
related:
  - id: e09aed7a-09e0-4c9a-90dd-f0d52507347e
    type: derived

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