RestrictedAdminMode Registry Value Tampering

Status: test
Severity: high
Log source: category registry_set, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

Detects changes to the "DisableRestrictedAdmin" registry value in order to disable or enable RestrictedAdmin mode. RestrictedAdmin mode prevents the transmission of reusable credentials to the remote system to which you connect using Remote Desktop. This prevents your credentials from being harvested during the initial connection process if the remote server has been compromise

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1112` Modify Registry
Defense Impairment	`T1112` Modify Registry

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 13: RegistryEvent (Value Set)

Rule body

title: RestrictedAdminMode Registry Value Tampering
id: d6ce7ebd-260b-4323-9768-a9631c8d4db2
related:
    - id: 28ac00d6-22d9-4a3c-927f-bbd770104573 # process_creation
      type: similar
status: test
description: |
    Detects changes to the "DisableRestrictedAdmin" registry value in order to disable or enable RestrictedAdmin mode.
    RestrictedAdmin mode prevents the transmission of reusable credentials to the remote system to which you connect using Remote Desktop.
    This prevents your credentials from being harvested during the initial connection process if the remote server has been compromise
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/a8e3cf63e97b973a25903d3df9fd55da6252e564/atomics/T1112/T1112.md
    - https://social.technet.microsoft.com/wiki/contents/articles/32905.remote-desktop-services-enable-restricted-admin-mode.aspx
author: frack113
date: 2023-01-13
modified: 2024-08-23
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1112
logsource:
    product: windows
    category: registry_set
detection:
    selection:
        TargetObject|endswith: 'System\CurrentControlSet\Control\Lsa\DisableRestrictedAdmin'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    TargetObject|endswith: 'System\CurrentControlSet\Control\Lsa\DisableRestrictedAdmin'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`TargetObject`	ends_with	`System\CurrentControlSet\Control\Lsa\DisableRestrictedAdmin`	`field:"TargetObject" kind:ends_with value:"System\CurrentControlSet\Control\Lsa\DisableRestrictedAdmin"`