Apache - Multiple client errors from single IP

let threshold = 100;
ApacheHTTPServer
| where HttpStatusCode >= 400 and HttpStatusCode <= 499
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleClientErrors > threshold
| extend IPCustomEntity = SrcIpAddr

triggerOperator: gt
description: |
    'Detects multiple client errors from one source in short timeframe'
status: Available
requiredDataConnectors:
- datatypes:
  - ApacheHTTPServer_CL
  connectorId: CustomLogsAma
kind: Scheduled
queryFrequency: 1h
id: 15f5a956-3af9-11ec-8d3d-0242ac130003
query: |
  let threshold = 100;
  ApacheHTTPServer
  | where HttpStatusCode >= 400 and HttpStatusCode <= 499
  | summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleClientErrors > threshold
  | extend IPCustomEntity = SrcIpAddr  
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
name: Apache - Multiple client errors from single IP
severity: Medium
queryPeriod: 1h
version: 1.0.3
relevantTechniques:
- T1190
- T1133
triggerThreshold: 0
tactics:
- InitialAccess
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ApacheHTTPServer/Analytic Rules/ApacheMultipleClientErrorsFromSingleIP.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/15f5a956-3af9-11ec-8d3d-0242ac130003')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/15f5a956-3af9-11ec-8d3d-0242ac130003')]",
      "properties": {
        "alertRuleTemplateName": "15f5a956-3af9-11ec-8d3d-0242ac130003",
        "customDetails": null,
        "description": "'Detects multiple client errors from one source in short timeframe'\n",
        "displayName": "Apache - Multiple client errors from single IP",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ApacheHTTPServer/Analytic Rules/ApacheMultipleClientErrorsFromSingleIP.yaml",
        "query": "let threshold = 100;\nApacheHTTPServer\n| where HttpStatusCode >= 400 and HttpStatusCode <= 499\n| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)\n| where MultipleClientErrors > threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}