Okta Multiple Users Failing To Authenticate From Ip
Last updated 2 days ago on 2026-07-17
About
The following analytic identifies instances where more than 10 unique user accounts have failed to authenticate from a single IP address within a 5-minute window in an Okta tenant. This detection uses OktaIm2 logs ingested via the Splunk Add-on for Okta Identity Cloud. Such activity is significant as it may indicate brute-force attacks or password spraying attempts. If confirmed malicious, this behavior suggests an external entity is attempting to compromise multiple user accounts, potentially leading to unauthorized access to organizational resources and data breaches.
- Platform
Splunk
- Tags
- Data Source: SplunkDomain: ApplicationRule Type: QueryOS: Any
- Severity
- medium
- Risk Score
- 47
- References
- https://attack.mitre.org/techniques/T1110/003/(external, opens in a new tab or window)https://splunkbase.splunk.com/app/6553(external, opens in a new tab or window)
- False Positives
- A source Ip failing to authenticate with multiple users in a short period of time is not common legitimate behavior.
- Source
- View on GitHub(external, opens in a new tab or window)
Definition
- Rule Language
- SPL
- Rule Type
- query
text code block:| tstats `security_content_summariesonly` count max(_time) as lastTime, min(_time) as firstTime dc(Authentication.user) as unique_accounts values(Authentication.signature) as signature values(Authentication.user) as user values(Authentication.app) as app values(Authentication.authentication_method) as authentication_method values(Authentication.dest) as dest FROM datamodel=Authentication WHERE Authentication.action="failure" AND Authentication.signature=user.session.start BY _time span=5m Authentication.src sourcetype | where unique_accounts > 9 | `drop_dm_object_name("Authentication")` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `okta_multiple_users_failing_to_authenticate_from_ip_filter`
View this rule on Splunk
This rule was sourced from the official Splunk public repository. View the original rule on GitHub(external, opens in a new tab or window).