Merge PR SigmaHQ#4844 from @frack113 - Update UAC based rules

update: UAC Disabled - update metadata new: UAC Secure Desktop Prompt Disabled new: UAC Notification Disabled --------- Co-authored-by: nasbench <[email protected]>
FilipPwn · May 10, 2024 · 7cdcb76 · 7cdcb76
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diff --git a/rules/windows/registry/registry_set/registry_set_disable_uac_registry.yml b/rules/windows/registry/registry_set/registry_set_disable_uac_registry.yml
diff --git a/rules/windows/registry/registry_set/registry_set_uac_disable.yml b/rules/windows/registry/registry_set/registry_set_uac_disable.yml
@@ -0,0 +1,30 @@
+title: UAC Disabled
+id: 48437c39-9e5f-47fb-af95-3d663c3f2919
+related:
+    - id: c5f6a85d-b647-40f7-bbad-c10b66bab038
+      type: similar
+    - id: 0d7ceeef-3539-4392-8953-3dc664912714
+      type: similar
+status: stable
+description: |
+    Detects when an attacker tries to disable User Account Control (UAC) by setting the registry value "EnableLUA" to 0.
+references:
+    - https://github.com/redcanaryco/atomic-red-team/blob/7e11e9b79583545f208a6dc3fa062f2ed443d999/atomics/T1548.002/T1548.002.md
+author: frack113
+date: 2022/01/05
+modified: 2024/05/10
+tags:
+    - attack.privilege_escalation
+    - attack.defense_evasion
+    - attack.t1548.002
+logsource:
+    category: registry_set
+    product: windows
+detection:
+    selection:
+        TargetObject|contains: '\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA'
+        Details: 'DWORD (0x00000000)'
+    condition: selection
+falsepositives:
+    - Unknown
+level: medium
diff --git a/rules/windows/registry/registry_set/registry_set_uac_disable_notification.yml b/rules/windows/registry/registry_set/registry_set_uac_disable_notification.yml
@@ -0,0 +1,32 @@
+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: experimental
+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.defense_evasion
+    - 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
diff --git a/rules/windows/registry/registry_set/registry_set_uac_disable_secure_desktop_prompt.yml b/rules/windows/registry/registry_set/registry_set_uac_disable_secure_desktop_prompt.yml
@@ -0,0 +1,31 @@
+title: UAC Secure Desktop Prompt Disabled
+id: 0d7ceeef-3539-4392-8953-3dc664912714
+related:
+    - id: c5f6a85d-b647-40f7-bbad-c10b66bab038
+      type: similar
+    - id: 48437c39-9e5f-47fb-af95-3d663c3f2919
+      type: similar
+status: experimental
+description: |
+    Detects when an attacker tries to change User Account Control (UAC) elevation request destination via the "PromptOnSecureDesktop" value.
+    The "PromptOnSecureDesktop" setting specifically determines whether UAC prompts are displayed on the secure desktop. The secure desktop is a separate desktop environment that's isolated from other processes running on the system. It's designed to prevent malicious software from intercepting or tampering with UAC prompts.
+    When "PromptOnSecureDesktop" is set to 0, UAC prompts are displayed on the user's current desktop instead of the secure desktop. This reduces the level of security because it potentially exposes the prompts to manipulation by malicious software.
+references:
+    - https://github.com/redcanaryco/atomic-red-team/blob/7e11e9b79583545f208a6dc3fa062f2ed443d999/atomics/T1548.002/T1548.002.md
+author: frack113
+date: 2024/05/10
+tags:
+    - attack.privilege_escalation
+    - attack.defense_evasion
+    - attack.t1548.002
+logsource:
+    category: registry_set
+    product: windows
+detection:
+    selection:
+        TargetObject|contains: '\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop'
+        Details: 'DWORD (0x00000000)'
+    condition: selection
+falsepositives:
+    - Unknown
+level: medium