Wazuh - Large Number of Web errors from an IP

CommonSecurityLog
| where DeviceProduct =~ "Wazuh"
| where Activity has "Web server 400 error code."
| where Message has "403"
| extend HostName=substring(split(DeviceCustomString1,")")[0],1)
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), NumberOfErrors = dcount(SourceIP) by HostName, SourceIP
| where NumberOfErrors > 400
| sort by NumberOfErrors desc
| extend timestamp = StartTime

relevantTechniques:
- T1110
name: Wazuh - Large Number of Web errors from an IP
requiredDataConnectors: []
entityMappings:
- fieldMappings:
  - identifier: HostName
    columnName: HostName
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: SourceIP
  entityType: IP
triggerThreshold: 0
id: 2790795b-7dba-483e-853f-44aa0bc9c985
tactics:
- CredentialAccess
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/CommonSecurityLog/Wazuh-Large_Number_of_Web_errors_from_an_IP.yaml
queryPeriod: 1d
kind: Scheduled
metadata:
  categories:
    domains:
    - Security - Others
    - Networking
  author:
    name: Jordan Ross
  support:
    tier: Community
  source:
    kind: Community
queryFrequency: 1d
severity: Low
description: |
    'Identifies instances where Wazuh logged over 400 '403' Web Errors from one IP Address. To onboard Wazuh data into Sentinel please view: https://github.com/wazuh/wazuh-documentation/blob/master/source/azure/monitoring%20activity.rst'
query: |
  CommonSecurityLog
  | where DeviceProduct =~ "Wazuh"
  | where Activity has "Web server 400 error code."
  | where Message has "403"
  | extend HostName=substring(split(DeviceCustomString1,")")[0],1)
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), NumberOfErrors = dcount(SourceIP) by HostName, SourceIP
  | where NumberOfErrors > 400
  | sort by NumberOfErrors desc
  | extend timestamp = StartTime  
triggerOperator: gt

{
  "$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/2790795b-7dba-483e-853f-44aa0bc9c985')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2790795b-7dba-483e-853f-44aa0bc9c985')]",
      "properties": {
        "alertRuleTemplateName": "2790795b-7dba-483e-853f-44aa0bc9c985",
        "customDetails": null,
        "description": "'Identifies instances where Wazuh logged over 400 '403' Web Errors from one IP Address. To onboard Wazuh data into Sentinel please view: https://github.com/wazuh/wazuh-documentation/blob/master/source/azure/monitoring%20activity.rst'\n",
        "displayName": "Wazuh - Large Number of Web errors from an IP",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIP",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/CommonSecurityLog/Wazuh-Large_Number_of_Web_errors_from_an_IP.yaml",
        "query": "CommonSecurityLog\n| where DeviceProduct =~ \"Wazuh\"\n| where Activity has \"Web server 400 error code.\"\n| where Message has \"403\"\n| extend HostName=substring(split(DeviceCustomString1,\")\")[0],1)\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), NumberOfErrors = dcount(SourceIP) by HostName, SourceIP\n| where NumberOfErrors > 400\n| sort by NumberOfErrors desc\n| extend timestamp = StartTime\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Low",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}