{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/30580043-2451-4d35-b49f-065728529f4a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/30580043-2451-4d35-b49f-065728529f4a')]",
      "properties": {
        "alertRuleTemplateName": "30580043-2451-4d35-b49f-065728529f4a",
        "customDetails": null,
        "description": "The attacker sends a spearphishing email to a user. The email contains a link which points to a website that eventually presents the user a download of an MS Office document. This document contains a malicious macro. The macro triggers one of the ASR rules. \nThis detection looks for Office ASR violations triggered by an Office document opened from a browser.\nNote: be aware that you need to have the proper ASR rules enabled for this detection to work. \n",
        "displayName": "Office ASR rule triggered from browser spawned office process.",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountSid",
                "identifier": "Sid"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "ProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic%20Rules/OfficeASRFromBrowser.yaml",
        "query": "// Add your own browsers here as well. \nlet browsers = dynamic([\"iexplore.exe\", \"chrome.exe\", \"firefox.exe\", \"msedge.exe\"]);\nDeviceEvents\n| where ActionType contains \"Office\"\n| where InitiatingProcessFileName in~ (browsers) or InitiatingProcessParentFileName in~ (browsers)\n// Ignore docx, xlsx and pptx files. These don't contain macros.\n| where not(FileName endswith \".docx\" or FileName endswith \".xlsx\" or FileName endswith \".pptx\")\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [
          "T1566.002"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}