Cisco Duo bypass code is used to authenticate user request

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Classification:

attack

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Goal

Detect when a Duo bypass code is used to authenticate a user request.

Strategy

This rule monitors successful authentication events in Cisco Duo logs where the reason is set to bypass_user.

Triage and Response

Contact the user {{@usr.email}} to confirm they used the bypass code.
If the user is unaware, investigate the authentication event, focusing on the IP address {{@access_device.ip}}, application {{@application.name}}, and user {{@usr.email}} involved.
If the event is deemed malicious, begin your organization’s incident response process to contain the affected account or device.