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

description: |
    'Detects multiple empty requests from same IP'
kind: Scheduled
tactics:
- InitialAccess
- Impact
requiredDataConnectors:
- connectorId: CustomLogsAma
  datatypes:
  - Tomcat_CL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Tomcat/Analytic Rules/TomcatMultipleEmptyRequestsFromSameIP.yaml
severity: Medium
name: Tomcat - Multiple empty requests from same IP
triggerThreshold: 0
queryPeriod: 1h
query: |
  let threshold = 50;
  TomcatEvent
  | where HttpResponseBodyBytes == 0
  | summarize MultipleClientErrors = count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | where MultipleClientErrors > threshold
  | extend IPCustomEntity = SrcIpAddr  
relevantTechniques:
- T1190
- T1133
- T1499
id: 7c9a1026-4872-11ec-81d3-0242ac130003
queryFrequency: 1h
status: Available
triggerOperator: gt
version: 1.0.2
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address

ARM