API - Account Takeover

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Id	25c86f99-0a91-4b7f-88f3-599a008e5ab8
Rulename	API - Account Takeover
Description	42Crunch API protection against account takeover
Severity	High
Tactics	CredentialAccess Discovery
Techniques	T1110 T1087
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/APIAccountTakeover.yaml
Version	1.0.0
Arm template	25c86f99-0a91-4b7f-88f3-599a008e5ab8.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_1" and (URI_Path_s has "/api/register" or URI_Path_s has "/api/reset") and Status_d == 403;
let recCount = iff((toscalar(firstRec | count) >= 20), 1, 0);
firstRec | take recCount

YAML

queryPeriod: 5m
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_1" and (URI_Path_s has "/api/register" or URI_Path_s has "/api/reset") and Status_d == 403;
  let recCount = iff((toscalar(firstRec | count) >= 20), 1, 0);
  firstRec | take recCount  
name: API - Account Takeover
entityMappings:
- fieldMappings:
  - columnName: Source_IP_s
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: Hostname_s
    identifier: HostName
  entityType: Host
- fieldMappings:
  - columnName: Instance_Name_s
    identifier: FullName
  entityType: Account
eventGroupingSettings:
  aggregationKind: SingleAlert
queryFrequency: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIAccountTakeover.yaml
description: |
    '42Crunch API protection against account takeover'
kind: Scheduled
version: 1.0.0
status: Available
severity: High
requiredDataConnectors:
- connectorId: 42CrunchAPIProtection
  dataTypes:
  - apifirewall_log_1_CL
triggerOperator: gt
triggerThreshold: 0
customDetails: 
tactics:
- CredentialAccess
- Discovery
id: 25c86f99-0a91-4b7f-88f3-599a008e5ab8
relevantTechniques:
- T1110
- T1087

ARM