Tomcat - Multiple empty requests from same IP

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Id	7c9a1026-4872-11ec-81d3-0242ac130003
Rulename	Tomcat - Multiple empty requests from same IP
Description	Detects multiple empty requests from same IP
Severity	Medium
Tactics	InitialAccess Impact
Techniques	T1190 T1133 T1499
Required data connectors	CustomLogsAma
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/Tomcat/Analytic Rules/TomcatMultipleEmptyRequestsFromSameIP.yaml
Version	1.0.2
Arm template	7c9a1026-4872-11ec-81d3-0242ac130003.json

KQL

let threshold = 50;
TomcatEvent
| where HttpResponseBodyBytes == 0
| summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
| where MultipleClientErrors > threshold
| extend IPCustomEntity = SrcIpAddr

YAML

status: Available
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
query: |
  let threshold = 50;
  TomcatEvent
  | where HttpResponseBodyBytes == 0
  | 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/TomcatMultipleEmptyRequestsFromSameIP.yaml
tactics:
- InitialAccess
- Impact
triggerThreshold: 0
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
requiredDataConnectors:
- connectorId: CustomLogsAma
  datatypes:
  - Tomcat_CL
kind: Scheduled
relevantTechniques:
- T1190
- T1133
- T1499
description: |
    'Detects multiple empty requests from same IP'
name: Tomcat - Multiple empty requests from same IP
version: 1.0.2
id: 7c9a1026-4872-11ec-81d3-0242ac130003
severity: Medium

ARM