SMB Create Remote File Admin Share
Look for non-system accounts SMB accessing a file with write (0x2) access mask via administrative share (i.e C$).
Detection logic
selection
EventID: 5145
ShareName|endswith: C$
AccessMask: "0x2"filter_main_subjectusername
SubjectUserName|endswith: $filter_optional_local_ip
IpAddress: ::1Condition
selection and not 1 of filter_main_* and not 1 of filter_optional_*Raw YAML
title: SMB Create Remote File Admin Share
id: b210394c-ba12-4f89-9117-44a2464b9511
status: test
description: Look for non-system accounts SMB accessing a file with write (0x2) access mask via administrative share (i.e C$).
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
author: Jose Rodriguez (@Cyb3rPandaH), OTR (Open Threat Research)
date: 2020-08-06
modified: 2025-10-17
tags:
- attack.lateral-movement
- attack.t1021.002
logsource:
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_*
falsepositives:
- Unknown
level: highFalse positives
- Unknown