A combolist is a structured text file containing millions of pairs of usernames (often email addresses) and passwords. The term "combo" refers to the specific pairing of these two pieces of data. Combolists and ULP Files on the Dark Web - Group-IB

The file name refers to a massive collection of stolen login credentials specifically targeted at Brazilian users or services. This type of file is known as a combolist , and it serves as a primary tool for cybercriminals to conduct large-scale account takeovers. What is a Combolist?