WebDav Client Execution Via Rundll32.EXE

calendar Oct 4, 2023 · attack.exfiltration attack.t1048.003  ·
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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).

Sigma rule (View on GitHub)

 1title: WebDav Client Execution Via Rundll32.EXE
 2id: 2dbd9d3d-9e27-42a8-b8df-f13825c6c3d5
 3status: test
 4description: |
 5    Detects "svchost.exe" spawning "rundll32.exe" with command arguments like "C:\windows\system32\davclnt.dll,DavSetCookie".
 6    This could be an indicator of exfiltration or use of WebDav to launch code (hosted on a WebDav server).    
 7references:
 8    - https://github.com/OTRF/detection-hackathon-apt29/issues/17
 9    - https://github.com/OTRF/ThreatHunter-Playbook/blob/2d4257f630f4c9770f78d0c1df059f891ffc3fec/docs/evals/apt29/detections/7.B.4_C10730EA-6345-4934-AA0F-B0EFCA0C4BA6.md
10author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
11date: 2020/05/02
12modified: 2023/09/18
13tags:
14    - attack.exfiltration
15    - attack.t1048.003
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection_parent:
21        ParentImage|endswith: '\svchost.exe'
22    selection_img:
23        - Image|endswith: '\rundll32.exe'
24        - OriginalFileName: 'RUNDLL32.EXE'
25    selection_cli:
26        CommandLine|contains: 'C:\windows\system32\davclnt.dll,DavSetCookie'
27    condition: all of selection_*
28falsepositives:
29    - Unknown
30level: medium

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