Microsoft Sentinel Analytic Rules
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API - JWT validation

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Idbbd163f4-1f56-434f-9c23-b06713c119c2
RulenameAPI - JWT validation
Description42Crunch API protection against JWT validation
SeverityLow
TacticsCredentialAccess
Required data connectors42CrunchAPIProtection
KindScheduled
Query frequency5m
Query period5m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIJWTValidation.yaml
Version1.0.0
Arm templatebbd163f4-1f56-434f-9c23-b06713c119c2.json
Deploy To Azure
apifirewall_log_1_CL 
| where TimeGenerated >= ago(5m) 
| where Error_Message_s has "missing [\"x-access-token\"]" 
| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Response_Header_s, Request_Header_s, Errors_s, Type, UUID_g 
| sort by TimeGenerated desc 
triggerThreshold: 0
severity: Low
id: bbd163f4-1f56-434f-9c23-b06713c119c2
relevantTechniques: 
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: Source_IP_s
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: Hostname_s
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: Instance_Name_s
status: Available
requiredDataConnectors:
- connectorId: 42CrunchAPIProtection
  dataTypes:
  - apifirewall_log_1_CL
version: 1.0.0
queryFrequency: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIJWTValidation.yaml
eventGroupingSettings:
  aggregationKind: SingleAlert
tactics:
- CredentialAccess
triggerOperator: gt
description: |
    '42Crunch API protection against JWT validation'
name: API - JWT validation
queryPeriod: 5m
customDetails: 
kind: Scheduled
query: |
  apifirewall_log_1_CL 
  | where TimeGenerated >= ago(5m) 
  | where Error_Message_s has "missing [\"x-access-token\"]" 
  | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Response_Header_s, Request_Header_s, Errors_s, Type, UUID_g 
  | sort by TimeGenerated desc   
{
  "$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/bbd163f4-1f56-434f-9c23-b06713c119c2')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/bbd163f4-1f56-434f-9c23-b06713c119c2')]",
      "properties": {
        "alertRuleTemplateName": "bbd163f4-1f56-434f-9c23-b06713c119c2",
        "customDetails": null,
        "description": "'42Crunch API protection against JWT validation'\n",
        "displayName": "API - JWT validation",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "Source_IP_s",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Hostname_s",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Instance_Name_s",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIJWTValidation.yaml",
        "query": "apifirewall_log_1_CL \n| where TimeGenerated >= ago(5m) \n| where Error_Message_s has \"missing [\\\"x-access-token\\\"]\" \n| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Response_Header_s, Request_Header_s, Errors_s, Type, UUID_g \n| sort by TimeGenerated desc \n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Low",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": null,
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}