Registry Persistence via AppInit DLLs Modification

Event
| where EventLog =~ "Microsoft-Windows-Sysmon/Operational" and EventID in (13)
| parse EventData with * 'TargetObject">' TargetObject "<" * 'Details">' Details "<" * 
| where TargetObject has "\\Windows NT\\CurrentVersion\\Windows\\AppInit_DLLs"
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventID, Computer, TargetObject, Details
| extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')

severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/RegistryPersistenceViaAppInt_DLLsModification.yaml
description: |
  'Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes. 
  Dynamic-link libraries (DLLs) that are specified in the AppInit_DLLs value in the Registry keys HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Windows or HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Windows are loaded by user32.dll into every process that loads user32.dll. In practice this is nearly every program, since user32.dll is a very common library.
  Ref: https://attack.mitre.org/techniques/T1546/010/'  
triggerOperator: gt
queryPeriod: 1h
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
queryFrequency: 1h
triggerThreshold: 0
tactics:
- Persistence
query: |
  Event
  | where EventLog =~ "Microsoft-Windows-Sysmon/Operational" and EventID in (13)
  | parse EventData with * 'TargetObject">' TargetObject "<" * 'Details">' Details "<" * 
  | where TargetObject has "\\Windows NT\\CurrentVersion\\Windows\\AppInit_DLLs"
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventID, Computer, TargetObject, Details
  | extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')  
status: Available
kind: Scheduled
relevantTechniques:
- T1546.010
version: 1.0.1
id: 9367dff0-941d-44e2-8875-cb48570c7add
entityMappings:
- fieldMappings:
  - columnName: TargetObject
    identifier: Key
  entityType: RegistryKey
- fieldMappings:
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
  entityType: Host
name: Registry Persistence via AppInit DLLs Modification

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/9367dff0-941d-44e2-8875-cb48570c7add')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9367dff0-941d-44e2-8875-cb48570c7add')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Registry Persistence via AppInit DLLs Modification",
        "description": "'Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes. \nDynamic-link libraries (DLLs) that are specified in the AppInit_DLLs value in the Registry keys HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Windows or HKEY_LOCAL_MACHINE\\Software\\Wow6432Node\\Microsoft\\Windows NT\\CurrentVersion\\Windows are loaded by user32.dll into every process that loads user32.dll. In practice this is nearly every program, since user32.dll is a very common library.\nRef: https://attack.mitre.org/techniques/T1546/010/'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "Event\n| where EventLog =~ \"Microsoft-Windows-Sysmon/Operational\" and EventID in (13)\n| parse EventData with * 'TargetObject\">' TargetObject \"<\" * 'Details\">' Details \"<\" * \n| where TargetObject has \"\\\\Windows NT\\\\CurrentVersion\\\\Windows\\\\AppInit_DLLs\"\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventID, Computer, TargetObject, Details\n| extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1546.010"
        ],
        "alertRuleTemplateName": "9367dff0-941d-44e2-8875-cb48570c7add",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "RegistryKey",
            "fieldMappings": [
              {
                "columnName": "TargetObject",
                "identifier": "Key"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ]
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/RegistryPersistenceViaAppInt_DLLsModification.yaml"
      }
    }
  ]
}