Cloudflare - Multiple error requests from single source

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Id	ef877d68-755f-4cf1-ac1d-f336e395667c
Rulename	Cloudflare - Multiple error requests from single source
Description	Detects multiple failure requests from single source in short timeframe.
Severity	Low
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	CloudflareDataConnector
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareMultipleErrorsSource.yaml
Version	1.0.0
Arm template	ef877d68-755f-4cf1-ac1d-f336e395667c.json

KQL

let threshold = 100;
Cloudflare
| where HttpRequestMethod =~ 'GET'
| summarize err_cnt = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where err_cnt > threshold
| extend IPCustomEntity = SrcIpAddr

YAML

tactics:
- InitialAccess
name: Cloudflare - Multiple error requests from single source
id: ef877d68-755f-4cf1-ac1d-f336e395667c
requiredDataConnectors:
- connectorId: CloudflareDataConnector
  dataTypes:
  - Cloudflare
query: |
  let threshold = 100;
  Cloudflare
  | where HttpRequestMethod =~ 'GET'
  | summarize err_cnt = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where err_cnt > threshold
  | extend IPCustomEntity = SrcIpAddr  
relevantTechniques:
- T1190
- T1133
description: |
    'Detects multiple failure requests from single source in short timeframe.'
triggerOperator: gt
queryPeriod: 1h
severity: Low
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
version: 1.0.0
triggerThreshold: 0
kind: Scheduled
queryFrequency: 1h
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareMultipleErrorsSource.yaml

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/ef877d68-755f-4cf1-ac1d-f336e395667c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ef877d68-755f-4cf1-ac1d-f336e395667c')]",
      "properties": {
        "alertRuleTemplateName": "ef877d68-755f-4cf1-ac1d-f336e395667c",
        "customDetails": null,
        "description": "'Detects multiple failure requests from single source in short timeframe.'\n",
        "displayName": "Cloudflare - Multiple error requests from single source",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareMultipleErrorsSource.yaml",
        "query": "let threshold = 100;\nCloudflare\n| where HttpRequestMethod =~ 'GET'\n| summarize err_cnt = count() by SrcIpAddr, bin(TimeGenerated, 5m)\n| where err_cnt > threshold\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}