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Threat actors download these lists from criminal marketplaces or public leak sites.

Lists are aggregated from multiple data breaches, infostealer malware logs, and database exposures.

Successful logins are used to drain funds, steal sensitive data, or launch secondary phishing campaigns. Download User Pass Combo

The list is loaded into automated bots that systematically test the credentials against popular services like banking, e-commerce, and social media.

What is Credential Stuffing | Attack Example & Defense Methods The list is loaded into automated bots that

Standardized for automation, often in simple user:pass text files that can be fed directly into account-checking tools.

Downloading a (or "combolist") is the act of acquiring a curated text file containing thousands to billions of stolen username and password pairs, typically formatted as email:password or username:password . These lists are the primary fuel for credential stuffing attacks, which exploit the common habit of password reuse across different platforms. Anatomy of a User Pass Combo These lists are the primary fuel for credential

Even with a low success rate (typically 0.1% to 2%), the massive scale of these lists allows attackers to compromise thousands of accounts quickly.