These lists are often compiled from "Stealer Logs" —data harvested from malware-infected devices—or from older, recycled data breaches from other websites where users reused their passwords.

The phrase typically refers to a "combo list" —a text file containing thousands of stolen user credentials (email/username and password pairs) used for unauthorized access to Valorant accounts . In the context of cybersecurity and gaming, "5k" indicates the file contains approximately 5,000 sets of credentials. Understanding Account "Combos" in Gaming

To secure your Riot Games account and prevent being included in future combo lists:

If you have encountered a file with this name or received a notification from services like Have I Been Pwned regarding an "ALIEN TXTBASE" or similar dump, your account information may be at risk.

Malicious actors use specialized software to "check" these 5,000 entries against Riot Games' login servers. Accounts that successfully log in are then sorted by their "value"—such as rare skins, high ranks, or attached payment methods—and sold on black-market forums. The Risks of Credential Leaks