Sigma rule: WebDav Client Execution Via Rundll32.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-ee7cec64a11d, updated 2023-09-18T00:00:00.000Z.

Rule

Title
WebDav Client Execution Via Rundll32.EXE
Status
test
Level
medium
Author
Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
Date
2020-05-02
Modified
2023-09-18
File
rules/windows/process_creation/proc_creation_win_rundll32_webdav_client_execution.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects "svchost.exe" spawning "rundll32.exe" with command arguments like "C:\windows\system32\davclnt.dll,DavSetCookie".
This could be an indicator of exfiltration or use of WebDav to launch code (hosted on a WebDav server).

Log source

product
windows
category
process_creation

Detection

selection_parent:
    ParentImage|endswith: '\svchost.exe'
selection_img:
    - Image|endswith: '\rundll32.exe'
    - OriginalFileName: 'RUNDLL32.EXE'
selection_cli:
    CommandLine|contains: 'C:\windows\system32\davclnt.dll,DavSetCookie'
condition: all of selection_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.exfiltration
  • attack.t1048.003

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_rundll32_webdav_client_execution.yml

Sources and licences

  • SigmaHQ

    "WebDav Client Execution Via Rundll32.EXE" by Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_rundll32_webdav_client_execution.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: WebDav Client Execution Via Rundll32.EXE",
entity page, dataset version ref-ee7cec64a11d, updated 2023-09-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/2dbd9d3d-9e27-42a8-b8df-f13825c6c3d5 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 2dbd9d3d-9e27-42a8-b8df-f13825c6c3d5, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.