Microsoft Sentinel Analytic Rules
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API - Anomaly Detection

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Id2c59e609-e0a0-4e8e-adc5-ab4224be8a36
RulenameAPI - Anomaly Detection
Description42Crunch API protection anomaly detection
SeverityLow
TacticsDefenseEvasion
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/APIAnomalyDetection.yaml
Version1.0.0
Arm template2c59e609-e0a0-4e8e-adc5-ab4224be8a36.json
Deploy To Azure
let infoRec = apifirewall_log_1_CL
| where TimeGenerated >= ago(5m) 
| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g
| where Instance_Name_s == "Instance_4" and URI_Path_s has "/api/users/info" and Status_d == 200;
let timestamp = toscalar(infoRec | top 1 by Timestamp_t desc | summarize by Timestamp_t);
let activityRec = apifirewall_log_1_CL
  | where Timestamp_t < timestamp and TimeGenerated >= ago(5m)
  | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g
  | where Instance_Name_s == "Instance_4" and URI_Path_s has "/api/users/activity" and Status_d == 200;
activityRec
status: Available
id: 2c59e609-e0a0-4e8e-adc5-ab4224be8a36
eventGroupingSettings:
  aggregationKind: SingleAlert
customDetails: 
requiredDataConnectors:
- connectorId: 42CrunchAPIProtection
  dataTypes:
  - apifirewall_log_1_CL
severity: Low
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIAnomalyDetection.yaml
kind: Scheduled
description: |
    '42Crunch API protection anomaly detection'
relevantTechniques: 
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: Source_IP_s
  entityType: IP
- fieldMappings:
  - identifier: HostName
    columnName: Hostname_s
  entityType: Host
- fieldMappings:
  - identifier: FullName
    columnName: Instance_Name_s
  entityType: Account
queryPeriod: 5m
triggerOperator: gt
queryFrequency: 5m
query: |
  let infoRec = apifirewall_log_1_CL
  | where TimeGenerated >= ago(5m) 
  | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g
  | where Instance_Name_s == "Instance_4" and URI_Path_s has "/api/users/info" and Status_d == 200;
  let timestamp = toscalar(infoRec | top 1 by Timestamp_t desc | summarize by Timestamp_t);
  let activityRec = apifirewall_log_1_CL
    | where Timestamp_t < timestamp and TimeGenerated >= ago(5m)
    | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g
    | where Instance_Name_s == "Instance_4" and URI_Path_s has "/api/users/activity" and Status_d == 200;
  activityRec  
version: 1.0.0
tactics:
- DefenseEvasion
name: API - Anomaly Detection
{
  "$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/2c59e609-e0a0-4e8e-adc5-ab4224be8a36')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2c59e609-e0a0-4e8e-adc5-ab4224be8a36')]",
      "properties": {
        "alertRuleTemplateName": "2c59e609-e0a0-4e8e-adc5-ab4224be8a36",
        "customDetails": null,
        "description": "'42Crunch API protection anomaly detection'\n",
        "displayName": "API - Anomaly Detection",
        "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/APIAnomalyDetection.yaml",
        "query": "let infoRec = apifirewall_log_1_CL\n| where TimeGenerated >= ago(5m) \n| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g\n| where Instance_Name_s == \"Instance_4\" and URI_Path_s has \"/api/users/info\" and Status_d == 200;\nlet timestamp = toscalar(infoRec | top 1 by Timestamp_t desc | summarize by Timestamp_t);\nlet activityRec = apifirewall_log_1_CL\n  | where Timestamp_t < timestamp and TimeGenerated >= ago(5m)\n  | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g\n  | where Instance_Name_s == \"Instance_4\" and URI_Path_s has \"/api/users/activity\" and Status_d == 200;\nactivityRec\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Low",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": null,
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}