Cybercriminals use automated tools (like OpenBullet or Sentry MBA) to test these millions of pairs against popular services—such as Netflix, Spotify, or banking portals—to see where users have reused passwords.

A combolist is a structured text file containing pairs of . These are aggregated from thousands of previous data breaches, phishing campaigns, or malware infections.

While these files are often marketed as "free accounts" for entertainment services, downloading them poses severe risks to your own device: Combo Breach - Aura Help Center