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
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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml
queryFrequency: 1h
triggerThreshold: 0
requiredDataConnectors:
- dataTypes:
  - TomcatEvent
  connectorId: ApacheTomcat
version: 1.0.0
status: Available
queryPeriod: 1h
id: 4fa66058-4870-11ec-81d3-0242ac130003
triggerOperator: gt
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
relevantTechniques:
- T1190
- T1133
severity: Medium
description: |
    'Detects multiple client errors from one source in short timeframe'
kind: Scheduled
tactics:
- InitialAccess
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4fa66058-4870-11ec-81d3-0242ac130003')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4fa66058-4870-11ec-81d3-0242ac130003')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Tomcat - Multiple client errors from single IP address",
        "description": "'Detects multiple client errors from one source in short timeframe'\n",
        "severity": "Medium",
        "enabled": true,
        "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",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1190",
          "T1133"
        ],
        "alertRuleTemplateName": "4fa66058-4870-11ec-81d3-0242ac130003",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleClientErrorsFromSingleIP.yaml"
      }
    }
  ]
}