Potential Abuse of Repeated MFA Push Notifications

Detects when an attacker abuses the Multi-Factor authentication mechanism by repeatedly issuing login requests until the user eventually accepts the Okta push notification. An adversary may attempt to bypass the Okta MFA policies configured for an organization to obtain unauthorized access.

Rule type: eql

Rule indices:

filebeat-*
logs-okta*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: None (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://www.mandiant.com/resources/russian-targeting-gov-business

Tags:

Elastic
Identity
Okta
Continuous Monitoring
SecOps
Identity and Access

Version: 5

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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## Setup

The Okta Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule query

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sequence by user.email with maxspan=10m
  [any where event.module == "okta" and event.action == "user.mfa.okta_verify.deny_push"]
  [any where event.module == "okta" and event.action == "user.mfa.okta_verify.deny_push"]
  [any where event.module == "okta" and event.action == "user.authentication.sso"]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Brute Force
- ID: T1110
- Reference URL: https://attack.mitre.org/techniques/T1110/

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