: These are the target keywords. Google will prioritize files where these two words appear close together, which is the standard format for credential lists.
: This is often a "quality" modifier used by those sharing leaked data (e.g., "Best combo list") or a way to find files that have been curated for high-value targets. The Risks of Credential Exposure Filetype Txt -gmail.com Username Password --BEST
To understand why this specific string is so potent, we have to look at each operator: : These are the target keywords
: This restricts Google to only return results that are plain text files. These are often logs, configuration files, or simple lists that are easily readable by both humans and automated bots. Filetype Txt -gmail.com Username Password --BEST