Windows File Share Discovery With Powerview

name: Windows File Share Discovery With Powerview
id: a44c0be1-d7ab-41e4-92fd-aa9af4fe232c
version: 9
date: '2026-03-10'
author: Mauricio Velazco, Splunk
type: TTP
status: production
data_source:
    - Powershell Script Block Logging 4104
description: The following analytic detects the execution of the Invoke-ShareFinder PowerShell cmdlet from PowerView. This detection leverages PowerShell Script Block Logging to identify instances where this specific command is executed. Monitoring this activity is crucial as it indicates an attempt to enumerate network file shares, which may contain sensitive information such as backups, scripts, and credentials. If confirmed malicious, this activity could enable an attacker to escalate privileges or move laterally within the network, potentially compromising additional systems and sensitive data.
search: |-
    `powershell` EventCode=4104  (ScriptBlockText=Invoke-ShareFinder*)
      | fillnull
      | stats count min(_time) as firstTime max(_time) as lastTime
        BY dest signature signature_id
           user_id vendor_product EventID
           Guid Opcode Name
           Path ProcessID ScriptBlockId
           ScriptBlockText
      | `security_content_ctime(firstTime)`
      | `security_content_ctime(lastTime)`
      | `windows_file_share_discovery_with_powerview_filter`
how_to_implement: To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://help.splunk.com/en/security-offerings/splunk-user-behavior-analytics/get-data-in/5.4.1/add-other-data-to-splunk-uba/configure-powershell-logging-to-see-powershell-anomalies-in-splunk-uba.=
known_false_positives: Security teams may leverage PowerView proactively to identify and remediate sensitive file shares. Filter as needed.
references:
    - https://github.com/PowerShellEmpire/PowerTools/blob/master/PowerView/powerview.ps1
    - https://thedfirreport.com/2023/01/23/sharefinder-how-threat-actors-discover-file-shares/
    - https://attack.mitre.org/techniques/T1135/
drilldown_searches:
    - name: View the detection results for - "$dest$" and "$user_id$"
      search: '%original_detection_search% | search  dest = "$dest$" user_id = "$user_id$"'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
    - name: View risk events for the last 7 days for - "$dest$" and "$user_id$"
      search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$", "$user_id$") starthoursago=168  | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
rba:
    message: Invoke-ShareFinder commandlet was executed on $dest$
    risk_objects:
        - field: dest
          type: system
          score: 50
        - field: user_id
          type: user
          score: 50
    threat_objects: []
tags:
    analytic_story:
        - Active Directory Privilege Escalation
        - Active Directory Discovery
    asset_type: Endpoint
    mitre_attack_id:
        - T1135
    product:
        - Splunk Enterprise
        - Splunk Enterprise Security
        - Splunk Cloud
    security_domain: endpoint
tests:
    - name: True Positive Test
      attack_data:
        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1135/powerview_sharefinder/windows-powershell.log
          source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
          sourcetype: XmlWinEventLog