These files are rarely from a single breach. Instead, they are "Compilations of Multiple Breaches" (COMB). : Recycled data from older, well-known leaks.
: Modern "ULP" (URL:Login:Password) files derived from malware like LummaC2 or RedLine, which harvest data directly from infected devices. COMBOLIST BRAZIL.txt
: Credentials are usually formatted as email:password or username:password . These files are rarely from a single breach
A "combolist" (short for combination list) is a plain text file containing vast quantities of leaked username and password pairs, typically used by cybercriminals for automated credential stuffing attacks. "COMBOLIST BRAZIL.txt" represents a geographically targeted subset of this data, specifically focused on Brazilian users, domains, or services. The Mechanics of Combolists "COMBOLIST BRAZIL
: Attackers often organize these lists by geography (e.g., "BRAZIL") to increase the success rate of attacks against local services like Brazilian banks, retail sites, or regional government portals. Sources of Data
: Unlike raw database dumps, combolists are cleaned and organized to be easily ingested by automated tools like OpenBullet .
: Platforms like ALIEN TXTBASE have recently become major distribution hubs for these datasets. Risks and Exploitation Combolists and ULP Files on the Dark Web - Group-IB