Failed Logins from Unknown or Invalid User

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Id	884be6e7-e568-418e-9c12-89229865ffde
Rulename	Failed Logins from Unknown or Invalid User
Description	This query searches for numerous login attempts to the management console with an unknown or invalid user name.
Severity	Medium
Tactics	CredentialAccess
Techniques	T1110
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/FailedLoginsFromUnknownOrInvalidUser.yaml
Version	1.1.1
Arm template	884be6e7-e568-418e-9c12-89229865ffde.json

KQL

let FailureThreshold = 15;
let FailedLogins = OktaSSO
| where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
| summarize count() by actor_alternateId_s, client_ipAddress_s, bin(TimeGenerated, 5m)
| where count_ > FailureThreshold
| project client_ipAddress_s, actor_alternateId_s;
OktaSSO
| join kind=inner (FailedLogins) on client_ipAddress_s, actor_alternateId_s
| where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
| summarize count() by actor_alternateId_s, ClientIP = client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), column_ifexists('published_t', now())
| sort by column_ifexists('published_t', now()) desc

YAML

severity: Medium
queryFrequency: 1h
query: |
  let FailureThreshold = 15;
  let FailedLogins = OktaSSO
  | where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
  | summarize count() by actor_alternateId_s, client_ipAddress_s, bin(TimeGenerated, 5m)
  | where count_ > FailureThreshold
  | project client_ipAddress_s, actor_alternateId_s;
  OktaSSO
  | join kind=inner (FailedLogins) on client_ipAddress_s, actor_alternateId_s
  | where eventType_s =~ "user.session.start" and outcome_reason_s =~ "VERIFICATION_ERROR"
  | summarize count() by actor_alternateId_s, ClientIP = client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), column_ifexists('published_t', now())
  | sort by column_ifexists('published_t', now()) desc  
kind: Scheduled
description: |
    'This query searches for numerous login attempts to the management console with an unknown or invalid user name.'
id: 884be6e7-e568-418e-9c12-89229865ffde
version: 1.1.1
requiredDataConnectors:
- dataTypes:
  - Okta_CL
  connectorId: OktaSSO
- dataTypes:
  - OktaSSO
  connectorId: OktaSSOv2
queryPeriod: 1h
triggerOperator: gt
name: Failed Logins from Unknown or Invalid User
status: Available
relevantTechniques:
- T1110
triggerThreshold: 0
tactics:
- CredentialAccess
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Okta Single Sign-On/Analytic Rules/FailedLoginsFromUnknownOrInvalidUser.yaml
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: actor_alternateId_s
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: ClientIP
  entityType: IP

ARM