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Description

The search looks for modifications to registry keys that control the enforcement of Windows User Account Control (UAC).

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2020-11-18
  • Author: David Dorsey, Patrick Bareiss, Splunk
  • ID: bbc644bc-37df-4e1a-9c88-ec9a53e2038c

Annotations

ATT&CK
ID Technique Tactic
T1548.002 Bypass User Account Control Defense Evasion, Privilege Escalation
T1548 Abuse Elevation Control Mechanism Defense Evasion, Privilege Escalation
Kill Chain Phase
  • Actions on Objectives
NIST
  • PR.PT
  • DE.CM
CIS20
  • CIS 8
CVE
1
2
3
4
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.registry_path=*HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\EnableLUA* Registry.registry_value_data="0x00000000" by Registry.dest, Registry.registry_key_name Registry.user Registry.registry_path Registry.registry_value_data Registry.action 
| `drop_dm_object_name(Registry)` 
| `disabling_remote_user_account_control_filter`

Macros

The SPL above uses the following Macros:

Note that disabling_remote_user_account_control_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

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

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 via other endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report registry modifications.

Known False Positives

This registry key may be modified via administrators to implement a change in system policy. This type of change should be a very rare occurrence.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
42.0 70 60 The Windows registry keys that control the enforcement of Windows User Account Control (UAC) were modified on $dest$ by $user$.

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