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Description

The following analytic identifies the use of the Invoke-ShareFinder PowerShell commandlet part of PowerView. This module obtains the list of all active domain computers and lists the active shares on each computer. Network file shares in Active Directory environments may contain sensitive information like backups, scripts, credentials, etc. Adversaries who have obtained a foothold in an AD network may leverage PowerView to identify secrets and leverage them for Privilege Escalation or Lateral Movement.

  • Type: TTP

  • Product: Splunk Behavioral Analytics

  • Last Updated: 2023-05-02
  • Author: Mauricio Velazco, Splunk
  • ID: ec4f671e-c736-4f78-a4c0-8fe809e952e5

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1552 Unsecured Credentials Credential Access
T1552.006 Group Policy Preferences Credential Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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 $main = from source  
| eval timestamp = time  
| eval metadata_uid = metadata.uid  
| eval device_hostname = device.hostname 
| eval process_file = process.file 
| eval process_file_path = process_file.path 
| eval process_uid = process.uid 
| eval process_cmd_line = process.cmd_line 
| eval actor_user = actor.user 
| eval actor_user_uid = actor_user.uid 
| where match(process_cmd_line, /(?i)invoke-sharefinder/)=true --finding_report--

Macros

The SPL above uses the following Macros:

:information_source: windows_file_share_discovery_with_powerview_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • device.hostname
  • process.file.path
  • process.uid
  • process.cmd_line
  • actor.user.uid

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://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.

Known False Positives

Unknown

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
48.0 60 80 Invoke-ShareFinder commandlet was executed on $Computer$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 4