The detection rule titled 'Auth0: MFA Authentication Failed' focuses on identifying failed multi-factor authentication (MFA) attempts. This rule is particularly vital as it highlights potential unauthorized access attempts by threat actors who may be attempting to breach accounts. Attackers often leverage various techniques, such as brute-force attacks or credential stuffing, to compromise accounts but might fail at the MFA step due to lacking the second factor. The logical implementation in Splunk revolves around gathering relevant authentication data from Auth0, specifically targeting events that indicate a failed MFA challenge. The query filters the necessary fields and groups the results over time to provide a clear view of failed login attempts, which helps security teams monitor for suspicious behavior and respond timely to potential threats.