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Description

The following analytic identifies a modification in the Windows registry related to DisableRestrictedAdmin. This registry entry is used to control the behavior of Restricted Admin mode, which is a security feature that limits the exposure of sensitive credentials when connecting remotely to another computer. When this registry value is set to 0 it indicates that Restricted Admin mode is enabled (default behavior). As with any modifications to registry settings, changing this entry should be approached cautiously, ensuring a clear understanding of the implications for system security and functionality. Unauthorized changes to these security settings can pose risks and should be monitored closely for any signs of tampering or unauthorized alterations.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2023-12-15
  • Author: Teoderick Contreras, Splunk
  • ID: cee573a0-7587-48e6-ae99-10e8c657e89a

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1112 Modify Registry Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Registry WHERE (Registry.registry_path= "*\\System\\CurrentControlSet\\Control\\Lsa\\DisableRestrictedAdmin" Registry.registry_value_data = 0x00000000) BY _time span=1h Registry.dest Registry.user Registry.registry_path Registry.registry_key_name Registry.registry_value_name Registry.registry_value_data Registry.process_guid 
| `drop_dm_object_name(Registry)` 
| where isnotnull(registry_value_data) 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `windows_modify_registry_disable_restricted_admin_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_modify_registry_disable_restricted_admin_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.

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

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.

Known False Positives

Administrator may change this registry setting. Filter as needed.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
64.0 80 80 Windows Modify Registry Disable Restricted Admin on $dest$ by $user$.

: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

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