1.4KK Mix Base UHQ Data Breach Exposes 1.4M Passwords Now

HEROIC Analysts Uncover a 1.4 Million-Record Stealer Log on Telegram

HEROIC's dark web monitoring team identified a stealer log file cataloged as "1.4KK Mix Base UHQ uploaded by a Telegram User," which surfaced on a Telegram channel on 09-Mar-2023. The file contains 1,478,417 records, each combining an email address, a plaintext password, and the URL of the website where those credentials were originally entered.

Why This Stealer Log Is Dangerous

Stealer logs like this one are especially dangerous because they hand attackers a ready-made login kit. Each record already links an email address to its exact password and the site it works on, so there is no guesswork involved. An attacker can simply take the URL, plug in the email and password, and log straight into the account. Because the passwords were stored and leaked in plaintext, there is no encryption standing between the data and anyone who gets their hands on this file.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the websites where the credentials were used

Why This Matters

Because each record pairs a working password with the exact site it belongs to, this data is well suited to account takeover: attackers can log in directly instead of guessing. It's also useful for credential stuffing, since anyone who reused that same email and password combination on other websites is at risk of having those accounts compromised too. If any of the leaked passwords match ones you still use today, or used recently, those accounts should be considered exposed.

How Stealer Logs Work

A stealer log is the output of malware that infects a device, quietly scans the browser's saved logins, autofill data, and active sessions, and sends everything back to whoever controls the malware. The result is a text file listing usernames, passwords, and the exact web addresses they were used on, all harvested at the moment the malware ran. These logs are frequently packaged up and shared or sold on Telegram channels and dark web forums, exactly like the file HEROIC analysts found here, which is what makes them so common and so dangerous.

Check If You Are Affected

The safest move is to find out whether your email address is part of this leak instead of assuming it isn't. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, and tells you immediately if you've been exposed. If a match turns up, change the affected password right away and avoid reusing it anywhere else.