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These lists are primarily used by cybercriminals for credential stuffing attacks . They use automated tools like OpenBullet to test thousands of stolen login pairs against various websites, betting that users have reused their passwords across different platforms. Risks to You: Download Russia Combo List [Learnto com] zip
If you are concerned about your own information appearing in such a list, you can take these steps: Use a trusted service like Have I Been
A combo list is a massive text file containing pairs of usernames/emails and passwords, often formatted as email:password . often formatted as email:password .