Imperva - Critical severity event not blocked

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Id	4d365217-f96a-437c-9c57-53594fa261c3
Rulename	Imperva - Critical severity event not blocked
Description	Detects when critical severity event was not blocked.
Severity	High
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	ImpervaWAFCloudAPI
Kind	Scheduled
Query frequency	10m
Query period	10m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaAttackNotBlocked.yaml
Version	1.0.1
Arm template	4d365217-f96a-437c-9c57-53594fa261c3.json

KQL

ImpervaWAFCloud
| where EventSeverity =~ 'CRITICAL'
| where DvcAction !startswith 'REQ_BLOCKED' or DvcAction !startswith 'REQ_BAD_'
| extend IPCustomEntity = SrcIpAddr

YAML

kind: Scheduled
tactics:
- InitialAccess
name: Imperva - Critical severity event not blocked
id: 4d365217-f96a-437c-9c57-53594fa261c3
queryFrequency: 10m
severity: High
version: 1.0.1
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaAttackNotBlocked.yaml
queryPeriod: 10m
description: |
    'Detects when critical severity event was not blocked.'
triggerOperator: gt
status: Available
requiredDataConnectors:
- dataTypes:
  - ImpervaWAFCloud
  connectorId: ImpervaWAFCloudAPI
query: |
  ImpervaWAFCloud
  | where EventSeverity =~ 'CRITICAL'
  | where DvcAction !startswith 'REQ_BLOCKED' or DvcAction !startswith 'REQ_BAD_'
  | extend IPCustomEntity = SrcIpAddr  
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
relevantTechniques:
- T1190
- T1133

ARM

{
  "$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/4d365217-f96a-437c-9c57-53594fa261c3')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4d365217-f96a-437c-9c57-53594fa261c3')]",
      "properties": {
        "alertRuleTemplateName": "4d365217-f96a-437c-9c57-53594fa261c3",
        "customDetails": null,
        "description": "'Detects when critical severity event was not blocked.'\n",
        "displayName": "Imperva - Critical severity event not blocked",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaAttackNotBlocked.yaml",
        "query": "ImpervaWAFCloud\n| where EventSeverity =~ 'CRITICAL'\n| where DvcAction !startswith 'REQ_BLOCKED' or DvcAction !startswith 'REQ_BAD_'\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT10M",
        "queryPeriod": "PT10M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}