If it prompted for a "Mobile Verification Code," he marked it as "RETRY" or "CUSTOM," knowing he’d need a different approach for MFA. Chapter 4: The Finishing Touch

Now for the . Yahoo often uses multi-step verification. Elias programmed his config to look for specific keywords in the source code:

Elias began with the . He knew that without a good proxy list, the config would be flagged before it even sent a single request. He enabled "Proxy Mandatory" and set the "Max Retries" to 3.