Microsoft Sentinel Analytic Rules
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Cloudflare - Bad client IP

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Ida7ce6135-9d55-4f14-b058-adc2e920a4fa
RulenameCloudflare - Bad client IP
DescriptionDetects requests from IP with bad reputation index.
SeverityMedium
TacticsInitialAccess
TechniquesT1190
T1133
Required data connectorsCloudflareDataConnector
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareBadClientIp.yaml
Version1.0.0
Arm templatea7ce6135-9d55-4f14-b058-adc2e920a4fa.json
Deploy To Azure
let ip_reputation = dynamic(['unknown', 'badHost', 'greylist', 'securityScanner', 'scan', 'tor']);
Cloudflare
| where ClientIPClass in~ (ip_reputation)
| extend IPCustomEntity = SrcIpAddr
| extend UrlCustomEntity = ClientRequestURI
status: Available
id: a7ce6135-9d55-4f14-b058-adc2e920a4fa
name: Cloudflare - Bad client IP
requiredDataConnectors:
- connectorId: CloudflareDataConnector
  dataTypes:
  - Cloudflare
severity: Medium
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareBadClientIp.yaml
kind: Scheduled
description: |
    'Detects requests from IP with bad reputation index.'
relevantTechniques:
- T1190
- T1133
queryPeriod: 1h
triggerOperator: gt
queryFrequency: 1h
query: |
  let ip_reputation = dynamic(['unknown', 'badHost', 'greylist', 'securityScanner', 'scan', 'tor']);
  Cloudflare
  | where ClientIPClass in~ (ip_reputation)
  | extend IPCustomEntity = SrcIpAddr
  | extend UrlCustomEntity = ClientRequestURI  
version: 1.0.0
tactics:
- InitialAccess
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: UrlCustomEntity
  entityType: URL
{
  "$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/a7ce6135-9d55-4f14-b058-adc2e920a4fa')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a7ce6135-9d55-4f14-b058-adc2e920a4fa')]",
      "properties": {
        "alertRuleTemplateName": "a7ce6135-9d55-4f14-b058-adc2e920a4fa",
        "customDetails": null,
        "description": "'Detects requests from IP with bad reputation index.'\n",
        "displayName": "Cloudflare - Bad client IP",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "UrlCustomEntity",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareBadClientIp.yaml",
        "query": "let ip_reputation = dynamic(['unknown', 'badHost', 'greylist', 'securityScanner', 'scan', 'tor']);\nCloudflare\n| where ClientIPClass in~ (ip_reputation)\n| extend IPCustomEntity = SrcIpAddr\n| extend UrlCustomEntity = ClientRequestURI\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}