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Description

This analytic is to detect a suspicious registry modification to disable security audit logs. This technique was shared by a researcher to disable Security logs of windows by adding this registry. The Windows will think it is WinPE and will not log any event to the Security Log

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2021-10-05
  • Author: Teoderick Contreras, Splunk
  • ID: 39ebdc68-25b9-11ec-aec7-acde48001122

ATT&CK

ID Technique Tactic
T1112 Modify Registry Defense Evasion

| tstats `security_content_summariesonly` count  min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.registry_path="*\\Control\\MiniNt\\*" by Registry.dest Registry.user Registry.registry_value_name Registry.registry_key_name Registry.registry_path Registry.registry_value_data 
| `security_content_ctime(lastTime)` 
| `security_content_ctime(firstTime)` 
| `disable_security_logs_using_minint_registry_filter`

Associated Analytic Story

How To Implement

To successfully implement this search, you must be ingesting data that records registry activity from your hosts to populate the endpoint data model in the registry node. This is typically populated via endpoint detection-and-response product, such as Carbon Black or endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report reads and writes to the registry.

Required field

  • _time
  • Registry.dest
  • Registry.user
  • Registry.registry_value_name
  • Registry.registry_key_name
  • Registry.registry_path
  • Registry.registry_value_data

Kill Chain Phase

  • Exploitation

Known False Positives

Unknown.

RBA

Risk Score Impact Confidence Message
80.0 80 100 modified/added/deleted registry entry $Registry.registry_path$ in $dest$

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

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