SMB Create Remote File Admin Share

calendar Oct 17, 2025 · attack.lateral-movement attack.t1021.002  ·
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Look for non-system accounts SMB accessing a file with write (0x2) access mask via administrative share (i.e C$).

Sigma rule (View on GitHub)

 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$).
 5references:
 6    - https://github.com/OTRF/ThreatHunter-Playbook/blob/f7a58156dbfc9b019f17f638b8c62d22e557d350/playbooks/WIN-201012004336.yaml
 7    - https://securitydatasets.com/notebooks/atomic/windows/lateral_movement/SDWIN-200806015757.html?highlight=create%20file
 8author: Jose Rodriguez (@Cyb3rPandaH), OTR (Open Threat Research)
 9date: 2020-08-06
10modified: 2025-10-17
11tags:
12    - attack.lateral-movement
13    - attack.t1021.002
14logsource:
15    product: windows
16    service: security
17detection:
18    selection:
19        EventID: 5145
20        ShareName|endswith: 'C$'
21        AccessMask: '0x2'
22    filter_main_subjectusername:
23        SubjectUserName|endswith: '$'
24    filter_optional_local_ip:
25        IpAddress: '::1'
26    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
27falsepositives:
28    - Unknown
29level: high

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