File Writes Within Admin Shares (RedCanary Threat Detection Report)

 1title: File Writes Within Admin Shares (RedCanary Threat Detection Report)
 2id: 7d5c80c9-c2a0-4eeb-9988-3d1ac170ffc0
 3status: experimental
 4description: Detects files written to an Admin Share. Part of the RedCanary 2023 Threat Detection Report.
 5references:
 6    - https://redcanary.com/threat-detection-report/techniques/windows-admin-shares/
 7author: RedCanary, Sigma formatting by Micah Babinski
 8date: 2023/05/10
 9tags:
10    - attack.lateral_movement
11    - attack.t1021.002
12logsource:
13    category: file_event
14    product: windows
15detection:
16    selection:
17        TargetFilename|endswith:
18            - '.exe'
19            - '.dll'
20            - '.bat'
21        TargetFilename|contains:
22            - 'ADMIN$'
23            - 'IPC$'
24            - 'C$'
25    condition: selection
26falsepositives:
27    - Depends; may require baselining and exclusions for legitimate use.
28level: low```

References

• SMB/Windows Admin Shares - Red Canary Threat Report

  

  Adversaries abuse Windows Admin Shares and the Server Message Block (SMB) protocol to move laterally and stage payloads for execution.

  
  Read More

Related rules

• Default Impacket Service Creation Via Registry Keys (RedCanary Threat Detection Report)
• Process Execution from Admin Share (RedCanary Threat Detection Report)
• Failed Mounting of Hidden Share
• Metasploit Or Impacket Service Installation Via SMB PsExec
• CobaltStrike Service Installations - System