Sigma rule: SMB Create Remote File Admin Share
A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-df1f06abe655, updated 2025-10-17T00:00:00.000Z.
Rule
- Title
- SMB Create Remote File Admin Share
- Status
- test
- Level
- high
- Author
- Jose Rodriguez (@Cyb3rPandaH), OTR (Open Threat Research)
- Date
- 2020-08-06
- Modified
- 2025-10-17
- File
- rules/windows/builtin/security/win_security_smb_file_creation_admin_shares.yml
- Commit
- ccbb0369507f796db0b0ae6854c8a2be471b9d84
Look for non-system accounts SMB accessing a file with write (0x2) access mask via administrative share (i.e C$).
Log source
- product
- windows
- service
- security
Detection
selection:
EventID: 5145
ShareName|endswith: 'C$'
AccessMask: '0x2'
filter_main_subjectusername:
SubjectUserName|endswith: '$'
filter_optional_local_ip:
IpAddress: '::1'
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*False positives (as the rule lists them)
- Unknown
Tags
- attack.lateral-movement
- attack.t1021.002
MITRE ATT&CK ids this rule names
References
- https://github.com/OTRF/ThreatHunter-Playbook/blob/f7a58156dbfc9b019f17f638b8c62d22e557d350/playbooks/WIN-201012004336.yaml
- https://securitydatasets.com/notebooks/atomic/windows/lateral_movement/SDWIN-200806015757.html?highlight=create%20file
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/builtin/security/win_security_smb_file_creation_admin_shares.yml
Sources and licences
SigmaHQ
"SMB Create Remote File Admin Share" by Jose Rodriguez (@Cyb3rPandaH), OTR (Open Threat Research) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_smb_file_creation_admin_shares.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Cite this page
Dragons Eye Ransomware Tracker, "Sigma rule: SMB Create Remote File Admin Share",
entity page, dataset version ref-df1f06abe655, updated 2025-10-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b210394c-ba12-4f89-9117-44a2464b9511 (accessed 2026-11-03).
Underlying source: SigmaHQ rule b210394c-ba12-4f89-9117-44a2464b9511, 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.