"Checkers" verify which accounts work on high-value targets.

Every line in that text file represents a real person’s privacy. Using or distributing this data facilitates identity theft and financial fraud. Defensive Countermeasures

Raw data is cleaned and formatted into a combolist.

The list is sold on specialized forums or leaked for free to build "reputation" within the hacking community. Risks and Ethical Implications

The single most effective way to render a combolist useless.

The primary purpose of a 163K combolist is to facilitate . This technique relies on the common habit of password reuse. Hackers use automated software (e.g., OpenBullet or SilverBullet) to feed this list into the login pages of various websites. If a user used the same password for a compromised pizza delivery site as they did for their primary email, the "stuffing" tool will successfully flag that account for takeover. The Lifecycle of Compromised Data Exfiltration: Data is stolen via SQL injection or phishing.