{
  "$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/0bdbce35-83e8-5528-b57e-0d6f4a66a716')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0bdbce35-83e8-5528-b57e-0d6f4a66a716')]",
      "properties": {
        "alertRuleTemplateName": "0bdbce35-83e8-5528-b57e-0d6f4a66a716",
        "customDetails": {
          "IncidentKind": "IncidentKind",
          "IncidentReference": "IncidentId",
          "IncidentSummary": "IncidentSummary"
        },
        "description": "Identifies Silverfort incidents involving Kerberos authentication failures caused by checksum mismatches. This behavior may indicate tampering or forged authentication packets.\n",
        "displayName": "Silverfort - Kerberos checksum mismatch",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserName",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "SourceHost",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DestinationHost",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic%20Rules/BadChecksum.yaml",
        "query": "CommonSecurityLog\n| where DeviceVendor has 'Silverfort'\n| where DeviceProduct has 'Admin Console'\n| where DeviceEventClassID == \"NewIncident\"\n| where Message has \"BadChecksum\"\n| extend IncidentData = parse_json(replace('^\"\"|\"\"$', '', Message))\n| extend IncidentKind = coalesce(tostring(IncidentData.data.kind), tostring(IncidentData.kind))\n| extend IncidentId = tostring(coalesce(IncidentData.data.id, IncidentData.id))\n| extend IncidentSummary = tostring(coalesce(IncidentData.data.summary, IncidentData.summary))\n| extend UserName = coalesce(\n    tostring(IncidentData.data.users[0].samAccountName),\n    tostring(IncidentData.data.users[0].upn),\n    tostring(IncidentData.data.users[0].displayName),\n    tostring(IncidentData.users[0].displayName)\n)\n| extend SourceHost = coalesce(\n    tostring(IncidentData.data.sources[0].displayName),\n    tostring(IncidentData.sources[0].displayName)\n)\n| extend DestinationHost = coalesce(\n    tostring(IncidentData.data.destinations[0].displayName),\n    tostring(IncidentData.destinations[0].displayName)\n)",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1558"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}