UAC Notification Disabled

Status: test
Severity: medium
Log source: category registry_set, product windows
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects when an attacker tries to disable User Account Control (UAC) notification by tampering with the "UACDisableNotify" value. UAC is a critical security feature in Windows that prevents unauthorized changes to the operating system. It prompts the user for permission or an administrator password before allowing actions that could affect the system's operation or change settings that affect other users. When "UACDisableNotify" is set to 1, UAC prompts are suppressed.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1548.002` Abuse Elevation Control Mechanism: Bypass User Account Control

Telemetry coverage

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

Rule body

title: UAC Notification Disabled
id: c5f6a85d-b647-40f7-bbad-c10b66bab038
related:
    - id: 0d7ceeef-3539-4392-8953-3dc664912714
      type: similar
    - id: 48437c39-9e5f-47fb-af95-3d663c3f2919
      type: similar
status: test
description: |
    Detects when an attacker tries to disable User Account Control (UAC) notification by tampering with the "UACDisableNotify" value.
    UAC is a critical security feature in Windows that prevents unauthorized changes to the operating system. It prompts the user for permission or an administrator password before allowing actions that could affect the system's operation or change settings that affect other users.
    When "UACDisableNotify" is set to 1, UAC prompts are suppressed.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/7e11e9b79583545f208a6dc3fa062f2ed443d999/atomics/T1548.002/T1548.002.md
    - https://securityintelligence.com/x-force/x-force-hive0129-targeting-financial-institutions-latam-banking-trojan/
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2024-05-10
tags:
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\Microsoft\Security Center\UACDisableNotify'
        Details: 'DWORD (0x00000001)'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    TargetObject|contains: '\Microsoft\Security Center\UACDisableNotify'
    Details: 'DWORD (0x00000001)'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Details`	eq	`DWORD (0x00000001)` corpus 40 (sigma 36, chronicle 4)	`field:"Details" kind:eq value:"DWORD (0x00000001)"`
`TargetObject`	match	`\Microsoft\Security Center\UACDisableNotify`	`field:"TargetObject" kind:match value:"\Microsoft\Security Center\UACDisableNotify"`