Potential Password Spray Attack

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Id	e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508
Rulename	Potential Password Spray Attack
Description	This query searches for failed attempts to log into the Okta console from more than 15 various users within a 5 minute timeframe from the same source. This is a potential indication of a password spray attack.
Severity	Medium
Tactics	CredentialAccess
Techniques	T1110.003
Required data connectors	OktaSSO OktaSSOv2
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/Okta Single Sign-On/Analytic Rules/PasswordSpray.yaml
Version	1.1.1
Arm template	e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508.json

KQL

let FailureThreshold = 15;
let FailedEvents = OktaSSO
| where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
| summarize dcount(actor_alternateId_s) by client_ipAddress_s, bin(TimeGenerated, 5m)
| where dcount_actor_alternateId_s > FailureThreshold
| project client_ipAddress_s, TimeGenerated;
OktaSSO
| where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
| summarize Users = make_set(actor_alternateId_s) by client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), bin(TimeGenerated, 5m)
| join kind=inner (FailedEvents) on client_ipAddress_s, TimeGenerated
| sort by TimeGenerated desc

YAML

query: |
  let FailureThreshold = 15;
  let FailedEvents = OktaSSO
  | where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
  | summarize dcount(actor_alternateId_s) by client_ipAddress_s, bin(TimeGenerated, 5m)
  | where dcount_actor_alternateId_s > FailureThreshold
  | project client_ipAddress_s, TimeGenerated;
  OktaSSO
  | where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
  | summarize Users = make_set(actor_alternateId_s) by client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), bin(TimeGenerated, 5m)
  | join kind=inner (FailedEvents) on client_ipAddress_s, TimeGenerated
  | sort by TimeGenerated desc  
description: |
    'This query searches for failed attempts to log into the Okta console from more than 15 various users within a 5 minute timeframe from the same source. This is a potential indication of a password spray attack.'
triggerOperator: gt
triggerThreshold: 0
queryPeriod: 1h
queryFrequency: 1h
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: client_ipAddress_s
    identifier: Address
name: Potential Password Spray Attack
status: Available
id: e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508
tactics:
- CredentialAccess
kind: Scheduled
requiredDataConnectors:
- connectorId: OktaSSO
  dataTypes:
  - Okta_CL
- connectorId: OktaSSOv2
  dataTypes:
  - OktaSSO
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Okta Single Sign-On/Analytic Rules/PasswordSpray.yaml
version: 1.1.1
severity: Medium
relevantTechniques:
- T1110.003

ARM