Microsoft Sentinel Analytic Rules
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Tomcat - Multiple client errors from single IP address

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Id4fa66058-4870-11ec-81d3-0242ac130003
RulenameTomcat - Multiple client errors from single IP address
DescriptionDetects multiple client errors from one source in short timeframe
SeverityMedium
TacticsInitialAccess
TechniquesT1190
T1133
Required data connectorsApacheTomcat
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
Version1.0.0
Arm template4fa66058-4870-11ec-81d3-0242ac130003.json
Deploy To Azure
let threshold = 100;
TomcatEvent
| where HttpStatusCode >= 400 and HttpStatusCode <= 499 
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleClientErrors > threshold
| extend IPCustomEntity = SrcIpAddr
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
id: 4fa66058-4870-11ec-81d3-0242ac130003
name: Tomcat - Multiple client errors from single IP address
query: |
  let threshold = 100;
  TomcatEvent
  | where HttpStatusCode >= 400 and HttpStatusCode <= 499 
  | summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleClientErrors > threshold
  | extend IPCustomEntity = SrcIpAddr  
entityMappings:
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
queryPeriod: 1h
triggerThreshold: 0
tactics:
- InitialAccess
version: 1.0.0
kind: Scheduled
relevantTechniques:
- T1190
- T1133
queryFrequency: 1h
status: Available
requiredDataConnectors:
- dataTypes:
  - TomcatEvent
  connectorId: ApacheTomcat
description: |
    'Detects multiple client errors from one source in short timeframe'
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": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4fa66058-4870-11ec-81d3-0242ac130003')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4fa66058-4870-11ec-81d3-0242ac130003')]",
      "properties": {
        "alertRuleTemplateName": "4fa66058-4870-11ec-81d3-0242ac130003",
        "customDetails": null,
        "description": "'Detects multiple client errors from one source in short timeframe'\n",
        "displayName": "Tomcat - Multiple client errors from single IP address",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml",
        "query": "let threshold = 100;\nTomcatEvent\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",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}