> Based on his analysis, Fowler determined the data was captured by some kind of infostealer malware. A popular tool used by cybercriminals, an infostealer is designed to grab usernames, passwords, and other sensitive data from breached sites and servers.
That part is just incorrect and doesn't make any sense. Infostealers typically grab the credentials that a victim of a malware has saved in browser password managers.
> Based on his analysis, Fowler determined the data was captured by some kind of infostealer malware. A popular tool used by cybercriminals, an infostealer is designed to grab usernames, passwords, and other sensitive data from breached sites and servers.