WebDav Client Execution Via Rundll32.EXE

 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

References

• 7.B) Data from Local System, Data Compressed, Data Encrypted, Exfiltration Over Alternative Protocol · Issue #17 · OTRF/detection-hackathon-apt29

  

  The attacker then collects files (T1005), which are compressed (T1002) and encrypted (T1022), before being exfiltrated to an attacker-controlled WebDAV share (T1048).

  
  Read More

• ThreatHunter-Playbook/docs/evals/apt29/detections/7.B.4_C10730EA-6345-4934-AA0F-B0EFCA0C4BA6.md at 2d4257f630f4c9770f78d0c1df059f891ffc3fec · OTRF/ThreatHunter-Playbook

  

  A community-driven, open-source project to share detection logic, adversary tradecraft and resources to make detection development more efficient. - OTRF/ThreatHunter-Playbook

  
  Read More

Related rules

• Data Exfiltration with Wget
• PowerShell ICMP Exfiltration
• Suspicious DNS Query with B64 Encoded String
• Suspicious Outbound SMTP Connections
• Suspicious WebDav Client Execution Via Rundll32.EXE