Detect .NET runtime being loaded in JScript for code execution

DeviceImageLoadEvents 
| where FileName in~ ("mscoree.dll", "mscorlib.dll", "mscorlib.ni.dll") 
| where tolower(InitiatingProcessFileName) in ("wscript.exe", "cscript.exe", "mshta.exe")

queryPeriod: 1h
entityMappings:
- fieldMappings:
  - columnName: InitiatingProcessAccountSid
    identifier: Sid
  - columnName: InitiatingProcessAccountName
    identifier: Name
  - columnName: InitiatingProcessAccountDomain
    identifier: NTDomain
  entityType: Account
- fieldMappings:
  - columnName: DeviceName
    identifier: FullName
  entityType: Host
- fieldMappings:
  - columnName: InitiatingProcessCommandLine
    identifier: CommandLine
  entityType: Process
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/DotNetToJScript.yaml
tactics:
- Execution
query: |
  DeviceImageLoadEvents 
  | where FileName in~ ("mscoree.dll", "mscorlib.dll", "mscorlib.ni.dll") 
  | where tolower(InitiatingProcessFileName) in ("wscript.exe", "cscript.exe", "mshta.exe")  
description: |
  This query detects .NET being loaded from wscript or cscript to run .NET code, such as cactustorch and sharpshooter.
  All based on the DotNetToJScript by James Foreshaw documented here https://github.com/tyranid/DotNetToJScript.   
queryFrequency: 1h
id: 9f921513-65f3-48a2-ae7d-326c5901c55e
status: Available
relevantTechniques:
- T1204
severity: Medium
version: 1.0.0
triggerThreshold: 0
kind: Scheduled
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceImageLoadEvents
name: Detect .NET runtime being loaded in JScript for code execution

{
  "$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/9f921513-65f3-48a2-ae7d-326c5901c55e')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9f921513-65f3-48a2-ae7d-326c5901c55e')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Detect .NET runtime being loaded in JScript for code execution",
        "description": "This query detects .NET being loaded from wscript or cscript to run .NET code, such as cactustorch and sharpshooter.\nAll based on the DotNetToJScript by James Foreshaw documented here https://github.com/tyranid/DotNetToJScript. \n",
        "severity": "Medium",
        "enabled": true,
        "query": "DeviceImageLoadEvents \n| where FileName in~ (\"mscoree.dll\", \"mscorlib.dll\", \"mscorlib.ni.dll\") \n| where tolower(InitiatingProcessFileName) in (\"wscript.exe\", \"cscript.exe\", \"mshta.exe\")\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1204"
        ],
        "alertRuleTemplateName": "9f921513-65f3-48a2-ae7d-326c5901c55e",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "Sid",
                "columnName": "InitiatingProcessAccountSid"
              },
              {
                "identifier": "Name",
                "columnName": "InitiatingProcessAccountName"
              },
              {
                "identifier": "NTDomain",
                "columnName": "InitiatingProcessAccountDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "DeviceName"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "identifier": "CommandLine",
                "columnName": "InitiatingProcessCommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/DotNetToJScript.yaml",
        "templateVersion": "1.0.0",
        "status": "Available"
      }
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  ]
}