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")

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

{
  "$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/9f921513-65f3-48a2-ae7d-326c5901c55e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9f921513-65f3-48a2-ae7d-326c5901c55e')]",
      "properties": {
        "alertRuleTemplateName": "9f921513-65f3-48a2-ae7d-326c5901c55e",
        "customDetails": null,
        "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",
        "displayName": "Detect .NET runtime being loaded in JScript for code execution",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatingProcessAccountSid",
                "identifier": "Sid"
              },
              {
                "columnName": "InitiatingProcessAccountName",
                "identifier": "Name"
              },
              {
                "columnName": "InitiatingProcessAccountDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "InitiatingProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/DotNetToJScript.yaml",
        "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",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1204"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}