The Naz.API dataset is a massive collection of 1 billion credentials compiled using credential stuffing lists and data stolen by information-stealing malware.
Credential stuffing lists are collections of login name and password pairs stolen from previous data breaches that are used to breach accounts on other sites.
Information-stealing malware attempts to steal a wide variety of data from an infected computer, including credentials saved in browsers, VPN clients, and FTP clients. This type of malware also attempts to steal SSH keys, credit cards, cookies, browsing history, and cryptocurrency wallets.
What’s more insane is that some of those passwords in the lists are I still live intrusions that companies haven’t acted on, like for example my Dropbox password is there and that’s a new password that I just gave them a few months ago before I deleted my account