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;
name: API - Rate limiting
eventGroupingSettings:
aggregationKind: SingleAlert
entityMappings:
- entityType: IP
fieldMappings:
- columnName: Source_IP_s
identifier: Address
- entityType: Host
fieldMappings:
- columnName: Hostname_s
identifier: HostName
- entityType: Account
fieldMappings:
- columnName: Instance_Name_s
identifier: FullName
description: |
'42Crunch API protection against rate limiting'
relevantTechniques:
- T1499
id: b808063b-07d5-432c-95d0-8900da61cce9
triggerOperator: gt
version: 1.0.1
queryFrequency: 5m
kind: Scheduled
status: Available
tactics:
- Impact
triggerThreshold: 0
queryPeriod: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIRateLimiting.yaml
requiredDataConnectors:
- dataTypes:
- apifirewall_log_1_CL
connectorId: 42CrunchAPIProtection
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;
severity: Medium
customDetails:
