Credential stuffing Credential stuffing does not go after unknown passwords; it tries known ones. With username and password pairs from databases leaked across the internet, the attacker tries the most-used services such as Facebook and Instagram, counting on people reusing the same credentials on several services — which in most cases holds.

Infostealer An infostealer has one basic role: to collect your credentials. Saved browser passwords, cookies and session tokens, autofill data, crypto wallet keys — all of it is of interest. It stays in contact with the attacker and sends on what it gathers. When the job is done it can delete itself and disappear.