SMB Create Remote File Admin Share

 1title: SMB Create Remote File Admin Share
 2id: b210394c-ba12-4f89-9117-44a2464b9511
 3status: test
 4description: Look for non-system accounts SMB accessing a file with write (0x2) access mask via administrative share (i.e C$).
 5references:
 6    - https://github.com/OTRF/ThreatHunter-Playbook/blob/f7a58156dbfc9b019f17f638b8c62d22e557d350/playbooks/WIN-201012004336.yaml
 7    - https://securitydatasets.com/notebooks/atomic/windows/lateral_movement/SDWIN-200806015757.html?highlight=create%20file
 8author: Jose Rodriguez (@Cyb3rPandaH), OTR (Open Threat Research)
 9date: 2020/08/06
10modified: 2021/11/27
11tags:
12    - attack.lateral_movement
13    - attack.t1021.002
14logsource:
15    product: windows
16    service: security
17detection:
18    selection:
19        EventID: 5145
20        ShareName|endswith: 'C$'
21        AccessMask: '0x2'
22    filter:
23        SubjectUserName|endswith: '$'
24    condition: selection and not filter
25falsepositives:
26    - Unknown
27level: high

References

• ThreatHunter-Playbook/playbooks/WIN-201012004336.yaml at f7a58156dbfc9b019f17f638b8c62d22e557d350 · 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

• Covenant Remote File Copy — Security Datasets

  Dataset Description# This dataset represents a threat actor remotely copying a file over SMB (CreateRequest).

  
  Read More

Related rules

• Potential DCOM InternetExplorer.Application DLL Hijack - Image Load
• Default Impacket Service Creation Via Registry Keys (RedCanary Threat Detection Report)
• File Writes Within Admin Shares (RedCanary Threat Detection Report)
• Process Execution from Admin Share (RedCanary Threat Detection Report)
• Failed Mounting of Hidden Share