Potential Fodhelper UAC Bypass ASIM Version

imRegistry
  | where EventType in ("RegistryValueSet", "RegistryKeyCreated")
  | where RegistryKey has "Software\\Classes\\ms-settings\\shell\\open\\command"
  | extend TimeKey = bin(TimeGenerated, 1h)
  | join (imProcess
  | where Process endswith "fodhelper.exe"
  | where ParentProcessName endswith "cmd.exe" or ParentProcessName endswith "powershell.exe" or ParentProcessName endswith "powershell_ise.exe"
  | extend TimeKey = bin(TimeGenerated, 1h)) on TimeKey, Dvc

version: 1.0.5
name: Potential Fodhelper UAC Bypass (ASIM Version)
queryFrequency: 2h
id: ac9e233e-44d4-45eb-b522-6e47445f6582
metadata:
  categories:
    domains:
    - Security - Others
  source:
    kind: Community
  author:
    name: Pete Bryan
  support:
    tier: Community
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: DvcHostname
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: DvcIpAddr
  entityType: IP
- fieldMappings:
  - identifier: FullName
    columnName: ActorUsername
  entityType: Account
queryPeriod: 2h
kind: Scheduled
triggerThreshold: 0
requiredDataConnectors: []
triggerOperator: gt
tactics:
- PrivilegeEscalation
query: |
  imRegistry
    | where EventType in ("RegistryValueSet", "RegistryKeyCreated")
    | where RegistryKey has "Software\\Classes\\ms-settings\\shell\\open\\command"
    | extend TimeKey = bin(TimeGenerated, 1h)
    | join (imProcess
    | where Process endswith "fodhelper.exe"
    | where ParentProcessName endswith "cmd.exe" or ParentProcessName endswith "powershell.exe" or ParentProcessName endswith "powershell_ise.exe"
    | extend TimeKey = bin(TimeGenerated, 1h)) on TimeKey, Dvc  
relevantTechniques:
- T1548.002
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/PotentialFodhelperUACBypass(ASIMVersion).yaml
description: |
    'This detection looks for the steps required to conduct a UAC bypass using Fodhelper.exe. By default this detection looks for the setting of the required registry keys and the invoking of the process within 1 hour - this can be tweaked as required.'
severity: Medium

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/ac9e233e-44d4-45eb-b522-6e47445f6582')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ac9e233e-44d4-45eb-b522-6e47445f6582')]",
      "properties": {
        "alertRuleTemplateName": "ac9e233e-44d4-45eb-b522-6e47445f6582",
        "customDetails": null,
        "description": "'This detection looks for the steps required to conduct a UAC bypass using Fodhelper.exe. By default this detection looks for the setting of the required registry keys and the invoking of the process within 1 hour - this can be tweaked as required.'\n",
        "displayName": "Potential Fodhelper UAC Bypass (ASIM Version)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DvcHostname",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "DvcIpAddr",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "ActorUsername",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/PotentialFodhelperUACBypass(ASIMVersion).yaml",
        "query": "imRegistry\n  | where EventType in (\"RegistryValueSet\", \"RegistryKeyCreated\")\n  | where RegistryKey has \"Software\\\\Classes\\\\ms-settings\\\\shell\\\\open\\\\command\"\n  | extend TimeKey = bin(TimeGenerated, 1h)\n  | join (imProcess\n  | where Process endswith \"fodhelper.exe\"\n  | where ParentProcessName endswith \"cmd.exe\" or ParentProcessName endswith \"powershell.exe\" or ParentProcessName endswith \"powershell_ise.exe\"\n  | extend TimeKey = bin(TimeGenerated, 1h)) on TimeKey, Dvc\n",
        "queryFrequency": "PT2H",
        "queryPeriod": "PT2H",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1548"
        ],
        "templateVersion": "1.0.5",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}