The LeakBase 12Kk ULP by firegoon Dump Exposed 1.6M Passwords

HEROIC analysts identified a stealer log dataset known as "12Kk ULP by firegoon" that surfaced on a hacking forum around May 28, 2024. The full dump reportedly contains close to 12 million entries, with 1,643,549 unique, verified records. The exposed data includes email addresses, the website URLs where those credentials were used, and plaintext passwords.

Why This Is Dangerous

Unlike breaches that expose hashed passwords, which attackers still have to crack, this dataset contains plaintext passwords, meaning the actual password is sitting right there for anyone who downloads the file. Combined with the website URL where each credential was used, an attacker has a ready-made list of exactly which site to log into with which email and password, no guessing required.

What Was Exposed in the 12Kk ULP Dump

• Email addresses
• Website URLs (login pages)
• Plaintext passwords

Why This Matters

This kind of data is the foundation of credential stuffing attacks, where automated tools try your exposed email and password combination across hundreds of other websites in seconds. If you reused this password anywhere else, from your email to your bank to your social media, that account is now at risk of takeover. Because the log includes the exact site each credential was used on, attackers can also target the most valuable accounts first, such as banking or shopping sites, rather than testing blindly.

How Stealer Logs Like This Work

A stealer log is created by infostealer malware, malicious software that infects a computer, often through a fake download, cracked software, or a malicious email attachment, and then quietly copies saved passwords, browser autofill data, and login sessions straight from the victim's device. The malware sends everything it finds back to the attacker in a structured format of URL, login, and password combinations, which is where the term "ULP" comes from. Unlike a single company's database breach, a stealer log usually contains credentials for dozens or hundreds of different websites pulled from one infected computer, and logs like this one are compiled from many infected machines and combined into a single, searchable file that gets sold or shared on forums.

Check If You Are Affected

With over 1.6 million unique records in this dump, there is a real chance your email address is included. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including this incident, and tells you immediately if you have been exposed. Run a free scan today and change any reused passwords right away.