428,280 Plaintext Passwords Exposed in the LeakBase 8.4Kk ULP Breach

On June 15, 2024, HEROIC analysts identified a stealer log posted to a cybercrime forum under the title "8.4Kk ULP by firegoon." The dataset contains 428,280 records, each pairing an email address with a plaintext password and the homepage URL the credential was used on.

Why This Is Dangerous

Stealer logs are captured directly from infected devices at the moment a person logs in, so the credentials in this dump were working passwords as of the theft date. Because the passwords are stored in plaintext, there is no encryption for an attacker to crack. Anyone who obtains this file can start testing logins immediately, and the included homepage URLs tell them exactly which site each password unlocks.

What Was Exposed

• Email addresses
• Plaintext passwords
• Homepage URLs

Why This Matters

A working email and password pair is the core ingredient of credential stuffing, where attackers automatically test the same login across hundreds of other websites. Because so many people reuse passwords, one exposed credential from this leak can open the door to email accounts, online banking, and shopping accounts, leading to account takeover, identity theft, and financial fraud. The homepage URL included with each record makes this faster, since it tells an attacker which specific service to target first.

How Stealer Log Breaches Work

This dump falls into the stealer log category, meaning it was not pulled from a single hacked company database. Instead, it was harvested by infostealer malware running quietly on infected computers. The malware typically spreads through phishing emails, cracked software, or malicious downloads. Once installed, it reads saved passwords and autofill data straight out of the victim's browser and sends everything back to the attacker, who then compiles thousands of these individual thefts into one combined file, like the one behind this post.

Check If You Are Affected

HEROIC's free breach scanner checks your email address against more than 400 billion exposed records, including stealer log dumps like this one. Visit heroic.com to run a free scan and find out whether your credentials were part of this leak.