Detecting UAC bypass - ChangePK and SLUI registry tampering

DeviceProcessEvents
| where InitiatingProcessParentFileName =~ "slui.exe"
| where InitiatingProcessFileName =~ "changepk.exe"
| where ProcessIntegrityLevel == "High"

queryPeriod: 1h
version: 1.0.0
tactics:
- Impact
queryFrequency: 1h
id: 829a69ba-93e1-491f-8a1f-b19506e9d88a
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - DeviceProcessEvents
  connectorId: MicrosoftThreatProtection
severity: Medium
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: FullName
- entityType: Account
  fieldMappings:
  - columnName: AccountSid
    identifier: Sid
  - columnName: AccountName
    identifier: Name
  - columnName: AccountDomain
    identifier: NTDomain
- entityType: Process
  fieldMappings:
  - columnName: ProcessCommandLine
    identifier: CommandLine
triggerThreshold: 0
relevantTechniques:
- T1490
query: |
  DeviceProcessEvents
  | where InitiatingProcessParentFileName =~ "slui.exe"
  | where InitiatingProcessFileName =~ "changepk.exe"
  | where ProcessIntegrityLevel == "High"  
kind: Scheduled
name: Detecting UAC bypass - ChangePK and SLUI registry tampering
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/UACBypass-3-changePK-SLUI-tampering.yaml
description: |
    This query identifies setting a registry key under HKCU, launching slui.exe and then ChangePK.exe.
status: Available

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/829a69ba-93e1-491f-8a1f-b19506e9d88a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/829a69ba-93e1-491f-8a1f-b19506e9d88a')]",
      "properties": {
        "alertRuleTemplateName": "829a69ba-93e1-491f-8a1f-b19506e9d88a",
        "customDetails": null,
        "description": "This query identifies setting a registry key under HKCU, launching slui.exe and then ChangePK.exe.\n",
        "displayName": "Detecting UAC bypass - ChangePK and SLUI registry tampering",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountSid",
                "identifier": "Sid"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "ProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/UACBypass-3-changePK-SLUI-tampering.yaml",
        "query": "DeviceProcessEvents\n| where InitiatingProcessParentFileName =~ \"slui.exe\"\n| where InitiatingProcessFileName =~ \"changepk.exe\"\n| where ProcessIntegrityLevel == \"High\"\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1490"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}