Detection: Okta Phishing Detection with FastPass Origin Check

EXPERIMENTAL DETECTION

This detection status is set to experimental. The Splunk Threat Research team has not yet fully tested, simulated, or built comprehensive datasets for this detection. As such, this analytic is not officially supported. If you have any questions or concerns, please reach out to us at research@splunk.com.

Updated Date: 2026-05-13 ID: f4ca0057-cbf3-44f8-82ea-4e330ee901d3 Author: Okta, Inc, Michael Haag, Splunk Type: TTP Product: Splunk Enterprise Security

Description

The following analytic identifies failed user authentication attempts in Okta due to FastPass declining a phishing attempt. It leverages Okta logs, specifically looking for events where multi-factor authentication (MFA) fails with the reason "FastPass declined phishing attempt." This activity is significant as it indicates that attackers are targeting users with real-time phishing proxies, attempting to capture credentials. If confirmed malicious, this could lead to unauthorized access to user accounts, potentially compromising sensitive information and furthering lateral movement within the organization.

Search

 1`okta` eventType="user.authentication.auth_via_mfa" AND result="FAILURE" AND outcome.reason="FastPass declined phishing attempt"
 2  
 3| stats count min(_time) as firstTime max(_time) as lastTime values(displayMessage)
 4    BY user eventType client.userAgent.rawUserAgent
 5       client.userAgent.browser outcome.reason
 6  
 7| `security_content_ctime(firstTime)`
 8  
 9| `security_content_ctime(lastTime)`
10  
11| `okta_phishing_detection_with_fastpass_origin_check_filter`

Data Source

Name	Platform	Sourcetype	Source
Okta	Other	`'OktaIM2:log'`	`'Okta'`

Macros Used

Name	Value
security_content_ctime	`convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)`
okta_phishing_detection_with_fastpass_origin_check_filter	`search *`

okta_phishing_detection_with_fastpass_origin_check_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK

+ Kill Chain Phases

+ NIST

+ CIS

- Threat Actors

ID	Technique	Tactic
T1078.001	Default Accounts	Initial Access
T1556	Modify Authentication Process	Persistence

Exploitation

Delivery

Installation

DE.CM

CIS 10

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting	Value
Disabled	true
Cron Schedule	`0 * * * *`
Earliest Time	`-70m@m`
Latest Time	`-10m@m`
Schedule Window	`auto`
Creates Finding (Notable)	Yes
Rule Title	`%name%`
Rule Description	`%description%`
Notable Event Fields	user, dest
Creates Intermediate Finding (Risk Event)	No

TTP detections generate a Finding (Notable) and may generate Intermediate Findings (Risk Events) for associated entities.

Implementation

This search is specific to Okta and requires Okta logs to be ingested in your Splunk deployment.

Known False Positives

Fidelity of this is high as Okta is specifying malicious infrastructure. Filter and modify as needed.

Associated Analytic Story

Okta Account Takeover

Finding

Title	Entity Field	Entity Type	Risk Score
Okta FastPass has prevented $user$ from authenticating to a malicious site.	user	user	50

References

https://sec.okta.com/fastpassphishingdetection

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	Not Applicable	N/A	N/A	N/A
Unit	❌ Failing	N/A	`N/A`	`N/A`
Integration	❌ Failing	N/A	`N/A`	`N/A`

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

Source: GitHub | Version: 9