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Potential Fodhelper UAC Bypass ASIM Version

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Idac9e233e-44d4-45eb-b522-6e47445f6582
RulenamePotential Fodhelper UAC Bypass (ASIM Version)
DescriptionThis 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.
SeverityMedium
TacticsPrivilegeEscalation
TechniquesT1548.002
KindScheduled
Query frequency2h
Query period2h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/PotentialFodhelperUACBypass(ASIMVersion).yaml
Version1.0.5
Arm templateac9e233e-44d4-45eb-b522-6e47445f6582.json
Deploy To Azure
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
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1548.002
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/PotentialFodhelperUACBypass(ASIMVersion).yaml
requiredDataConnectors: []
queryPeriod: 2h
tactics:
- PrivilegeEscalation
severity: Medium
triggerOperator: gt
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.'
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  
name: Potential Fodhelper UAC Bypass (ASIM Version)
version: 1.0.5
metadata:
  support:
    tier: Community
  categories:
    domains:
    - Security - Others
  author:
    name: Pete Bryan
  source:
    kind: Community
id: ac9e233e-44d4-45eb-b522-6e47445f6582
queryFrequency: 2h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DvcHostname
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: DvcIpAddr
    identifier: Address
- entityType: Account
  fieldMappings:
  - columnName: ActorUsername
    identifier: FullName
{
  "$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"
    }
  ]
}