A combolist scraper is a tool or script used to collect or "scrape" lists of combinations, typically of usernames and passwords, from various online sources. These sources can include websites, forums, or databases. The collected information is often stored in a text file, referred to as a "combolist."
In the context of hacking or cracking, combolist scrapers are used to gather credentials for potential illegal activities, such as credential stuffing attacks. In these attacks, the scraped usernames and passwords are tested on various websites to gain unauthorized access.