The credentials are typically structured in a simple text format (e.g., user@example.com:Password123 ) to be easily ingested by automated hacking tools.

These lists are created by combining data from multiple historical breaches, phishing campaigns, or malware like "info-stealers".

Some lists are categorized by region, industry, or specific email service provider (e.g., Gmail, Orange.fr) to increase the efficiency of targeted attacks. 2. How These Lists Are Used

A is a text file containing compiled pairs of email addresses and passwords, often formatted as email:password . These lists, such as the "119k Mail Access Combo," are aggregated from various security breaches and are primarily used by cybercriminals for automated attacks like credential stuffing . 1. Composition and Origin