API - Rate limiting

Back


Id	b808063b-07d5-432c-95d0-8900da61cce9
Rulename	API - Rate limiting
Description	42Crunch API protection against rate limiting
Severity	Medium
Tactics	Impact
Techniques	T1499
Required data connectors	42CrunchAPIProtection
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIRateLimiting.yaml
Version	1.0.1
Arm template	b808063b-07d5-432c-95d0-8900da61cce9.json

KQL

let firstRec = apifirewall_log_1_CL
| where TimeGenerated >= ago(5m) 
| project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g
| where Instance_Name_s == "Instance_8" and URI_Path_s has "/api/login" and Status_d == 429;
let rateLimitCount = (toscalar(firstRec | count));
let recCount = iff((rateLimitCount > 20), 1, 0);
firstRec | top recCount by Timestamp_t desc;

YAML

eventGroupingSettings:
  aggregationKind: SingleAlert
triggerThreshold: 0
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: Source_IP_s
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: Hostname_s
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: Instance_Name_s
requiredDataConnectors:
- dataTypes:
  - apifirewall_log_1_CL
  connectorId: 42CrunchAPIProtection
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIRateLimiting.yaml
customDetails: 
name: API - Rate limiting
relevantTechniques:
- T1499
status: Available
version: 1.0.1
queryPeriod: 5m
kind: Scheduled
id: b808063b-07d5-432c-95d0-8900da61cce9
query: |
  let firstRec = apifirewall_log_1_CL
  | where TimeGenerated >= ago(5m) 
  | project-away Non_blocking_mode_b, Source_Port_d, Destination_Port_d, Query_s, API_ID_g, Request_Header_s, Response_Header_s, Errors_s, Type, UUID_g
  | where Instance_Name_s == "Instance_8" and URI_Path_s has "/api/login" and Status_d == 429;
  let rateLimitCount = (toscalar(firstRec | count));
  let recCount = iff((rateLimitCount > 20), 1, 0);
  firstRec | top recCount by Timestamp_t desc;  
description: |
    '42Crunch API protection against rate limiting'
queryFrequency: 5m
severity: Medium
triggerOperator: gt
tactics:
- Impact

ARM