API - BOLA

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Id	1b047dc3-a879-4f99-949b-d1dc867efc83
Rulename	API - BOLA
Description	42Crunch API protection against BOLA
Severity	Medium
Tactics	Exfiltration
Techniques	T1020
Required data connectors	42CrunchAPIProtection FortyTwoCrunchAPIProtection
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/APIBOLA.yaml
Version	3.0.1
Arm template	1b047dc3-a879-4f99-949b-d1dc867efc83.json

KQL

let loginRec = FortyTwoCrunchAPIProtection
| where TimeGenerated >= ago(5m) 
| project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
| where UriPath has "/api/login" and Status == 200;
let ipAddress = toscalar(loginRec
| top 1 by Timestamp desc
| summarize by SourceIp);
let listRec = FortyTwoCrunchAPIProtection
| where TimeGenerated >= ago(5m) 
| project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
| where UriPath has "/api/accounts/list" and Status == 200;
let listCnt = (toscalar(listRec | count));
let accountRec = FortyTwoCrunchAPIProtection
| where TimeGenerated >= ago(5m) 
| project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
| where SourceIp == ipAddress and UriPath matches regex "/api/accounts/\\d{6}$";
let accountCnt = (toscalar(accountRec | count));
let recCount = iff((toscalar(listRec | count) == 0) and (accountCnt > 5), accountCnt, 0);
accountRec | take recCount

YAML

entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIp
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: Hostname
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: InstanceName
tactics:
- Exfiltration
requiredDataConnectors:
- dataTypes:
  - FortyTwoCrunchAPIProtection
  connectorId: 42CrunchAPIProtection
- dataTypes:
  - FortyTwoCrunchAPIProtection
  connectorId: FortyTwoCrunchAPIProtection
id: 1b047dc3-a879-4f99-949b-d1dc867efc83
severity: Medium
status: Available
customDetails: 
query: |
  let loginRec = FortyTwoCrunchAPIProtection
  | where TimeGenerated >= ago(5m) 
  | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
  | where UriPath has "/api/login" and Status == 200;
  let ipAddress = toscalar(loginRec
  | top 1 by Timestamp desc
  | summarize by SourceIp);
  let listRec = FortyTwoCrunchAPIProtection
  | where TimeGenerated >= ago(5m) 
  | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
  | where UriPath has "/api/accounts/list" and Status == 200;
  let listCnt = (toscalar(listRec | count));
  let accountRec = FortyTwoCrunchAPIProtection
  | where TimeGenerated >= ago(5m) 
  | project-away NonBlockingMode, SourcePort, DestinationPort, Query, ApiId, RequestHeader, ResponseHeader, Errors, EventType, Uuid
  | where SourceIp == ipAddress and UriPath matches regex "/api/accounts/\\d{6}$";
  let accountCnt = (toscalar(accountRec | count));
  let recCount = iff((toscalar(listRec | count) == 0) and (accountCnt > 5), accountCnt, 0);
  accountRec | take recCount  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/42Crunch API Protection/Analytic Rules/APIBOLA.yaml
kind: Scheduled
queryPeriod: 5m
version: 3.0.1
name: API - BOLA
queryFrequency: 5m
eventGroupingSettings:
  aggregationKind: SingleAlert
relevantTechniques:
- T1020
description: |
    '42Crunch API protection against BOLA'
triggerThreshold: 0
triggerOperator: gt

ARM