3.7KK USA Base UHQ Leak: 2,474,078 Records Exposed Since 2023

2,474,078 Records Have Been Circulating Since March 2023

HEROIC analysts identified a stealer log named "3.7KK USA Base UHQ" that was first uploaded to Telegram on March 9, 2023. In the time since, this file has contained 2,474,078 records, each one linking an email address to a plaintext password and the URL of the site the credentials were used on. Files of this size tend to circulate and get re-shared repeatedly across criminal channels long after their original posting date, meaning the exposure window for anyone in this file has likely stretched well beyond its initial release.

Why This Is Dangerous

With nearly 2.5 million plaintext passwords in a single file, an attacker does not need to target anyone specifically; automated tools can work through the entire list systematically. Every record hands over a working email, password, and destination site with no decryption required, and the sheer scale of this file makes it an efficient resource for large-scale credential stuffing campaigns rather than a one-off attack.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs and endpoints tied to each login

Why This Matters

A file of this size means millions of password and email combinations are available for testing against banking, shopping, and email accounts. If your credentials were caught up in this log back in March 2023, they may have already been tested, resold, or bundled into newer combo lists in the years since, extending the risk well past the original leak date. Reused passwords remain the single biggest factor turning this kind of leak into account takeover or financial fraud.

How Stealer Logs Work

Stealer malware infects devices through pirated software, cracked applications, or malicious attachments, then quietly harvests saved passwords and autofill data from the browser. That information is compiled into a log file and delivered to the attacker, often automatically through a Telegram bot. Large compilations like "3.7KK USA Base UHQ" are typically built by combining data from many individual infections over time, which is how a single file can reach a total in the millions.

Check If You Are Affected

Given how long a file like this can remain in circulation, checking your exposure now matters even if the original leak happened years ago. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including large stealer logs like this one, so you can confirm your status and secure any accounts still using an exposed password.