:warning: THIS IS A EXPERIMENTAL DETECTION

This detection has been marked experimental by the Splunk Threat Research team. This means we have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is NOT supported.

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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.

  • Type: TTP

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-05-15
  • Author: Okta, Inc, Michael Haag, Splunk
  • ID: f4ca0057-cbf3-44f8-82ea-4e330ee901d3

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1078 Valid Accounts Defense Evasion, Persistence, Privilege Escalation, Initial Access
T1078.001 Default Accounts Defense Evasion, Persistence, Privilege Escalation, Initial Access
T1556 Modify Authentication Process Credential Access, Defense Evasion, Persistence
Kill Chain Phase
  • Exploitation
  • Installation
  • Delivery
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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`okta` eventType="user.authentication.auth_via_mfa" AND result="FAILURE" AND outcome.reason="FastPass declined phishing attempt" 
| stats count min(_time) as firstTime max(_time) as lastTime values(displayMessage) by user eventType client.userAgent.rawUserAgent client.userAgent.browser outcome.reason 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `okta_phishing_detection_with_fastpass_origin_check_filter`

Macros

The SPL above uses the following Macros:

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

Required fields

List of fields required to use this analytic.

  • _time
  • eventType
  • client.userAgent.rawUserAgent
  • client.userAgent.browser
  • outcome.reason
  • displayMessage

How To Implement

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

RBA

Risk Score Impact Confidence Message
100.0 100 100 Okta FastPass has prevented $user$ from authenticating to a malicious site.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

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 | version: 2