9.3KK Mix Gold Base: What 9 Million Leaked Logins Reveal

HEROIC's threat research team identified 9.3KK Mix Gold Base, a combolist shared on Telegram on April 2, 2023. The file contains 9,004,323 records pairing email addresses with plaintext passwords and the web addresses those credentials unlock.

Why This Is Dangerous

A combolist is a ready-to-use attack tool. Because the passwords are stored in plaintext and matched to a specific login URL, anyone who downloads this file can immediately try the credentials on the site they belong to, no cracking or guessing required. At over 9 million records, this file gives an attacker enough volume to run large-scale automated login attempts across the internet.

What Was Exposed

Inside the "9.3KK" File

• Email addresses
• Plaintext passwords
• The login URLs tied to each credential pair

In dark web file-naming slang, "KK" is shorthand for thousands, so "9.3KK" signals roughly 9.3 million lines, a naming pattern common on stealer and combolist marketplaces.

Why This Matters

• Credential stuffing: Automated tools feed these exact email-and-password pairs into hundreds of websites at once, testing for reuse.
• Account takeover: A match on even one site can give an attacker full control of that account, including linked payment methods or personal data.
• Follow-on phishing: Exposed emails become targets for tailored phishing messages that reference real account details to appear legitimate.

How Combolist Attacks Work

Combolists are compiled, not stolen in a single hack. Criminals pull email-and-password pairs from older breaches, stealer log malware, and other leaked databases, then merge them into a single formatted list, usually a plain text file with each line reading something like email:password:url. Once assembled, lists like this are shared for free or sold in Telegram channels and dark web forums, where other attackers pick them up and run automated login attempts against banking, email, and shopping sites.

Check If You Are Affected

You don't have to guess whether your information is part of a leak like this one. HEROIC's free breach scanner checks your email address against a database of more than 400 billion compromised records, including combolists, stealer logs, and confirmed corporate breaches. If a match turns up, HEROIC will show you exactly what was exposed and walk you through the steps to secure your accounts.