API - Anomaly Detection

let infoRec = FortyTwoCrunchAPIProtection
| where TimeGenerated >= ago(5m) 
| project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
| where UriPath has "/api/users/info" and Status == 200;
let timestamp = toscalar(infoRec | top 1 by Timestamp desc | summarize by Timestamp);
let activityRec = FortyTwoCrunchAPIProtection
  | where Timestamp < timestamp and TimeGenerated >= ago(5m)
  | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
  | where UriPath has "/api/users/activity" and Status == 200;
activityRec

triggerOperator: gt
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIp
  entityType: IP
- fieldMappings:
  - identifier: HostName
    columnName: Hostname
  entityType: Host
- fieldMappings:
  - identifier: FullName
    columnName: InstanceName
  entityType: Account
status: Available
triggerThreshold: 0
description: |
  '42Crunch API protection anomaly detection'
severity: Low
kind: Scheduled
queryPeriod: 5m
relevantTechniques:
- T1593
- T1589
id: 2c59e609-e0a0-4e8e-adc5-ab4224be8a36
eventGroupingSettings:
  aggregationKind: SingleAlert
queryFrequency: 5m
query: |
  let infoRec = FortyTwoCrunchAPIProtection
  | where TimeGenerated >= ago(5m) 
  | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
  | where UriPath has "/api/users/info" and Status == 200;
  let timestamp = toscalar(infoRec | top 1 by Timestamp desc | summarize by Timestamp);
  let activityRec = FortyTwoCrunchAPIProtection
    | where Timestamp < timestamp and TimeGenerated >= ago(5m)
    | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
    | where UriPath has "/api/users/activity" and Status == 200;
  activityRec
tactics:
- Reconnaissance
name: API - Anomaly Detection
requiredDataConnectors:
- connectorId: 42CrunchAPIProtection
  dataTypes:
  - FortyTwoCrunchAPIProtection
- connectorId: FortyTwoCrunchAPIProtection
  dataTypes:
  - FortyTwoCrunchAPIProtection
version: 3.0.1
customDetails: 
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch%20API%20Protection/Analytic%20Rules/APIAnomalyDetection.yaml

{
  "$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/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": "SourceIp",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Hostname",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InstanceName",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch%20API%20Protection/Analytic%20Rules/APIAnomalyDetection.yaml",
        "query": "let infoRec = FortyTwoCrunchAPIProtection\n| where TimeGenerated >= ago(5m) \n| project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid\n| where UriPath has \"/api/users/info\" and Status == 200;\nlet timestamp = toscalar(infoRec | top 1 by Timestamp desc | summarize by Timestamp);\nlet activityRec = FortyTwoCrunchAPIProtection\n  | where Timestamp < timestamp and TimeGenerated >= ago(5m)\n  | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid\n  | where UriPath has \"/api/users/activity\" and Status == 200;\nactivityRec\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Reconnaissance"
        ],
        "techniques": [
          "T1589",
          "T1593"
        ],
        "templateVersion": "3.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}