LeakBase 15Kk ULP #3: 1.8 Million Plaintext Passwords Exposed

What HEROIC Analysts Found in the LeakBase 15Kk ULP #3 Dump

On April 26, 2024, HEROIC analysts identified a stealer log titled "15Kk ULP #3" posted by a user known as firegoon on a popular hacking forum. The log contained 1,801,983 unique email addresses, each paired with a plaintext password and a homepage URL showing which website the credentials belong to. This combination, known as a ULP or username, password, login page dump, is one of the most directly usable formats for attackers.

Why the Plaintext Passwords in This Dump Are Dangerous

Unlike breaches where passwords are hashed or encrypted, these credentials are stored in plaintext, meaning anyone who downloads this file can read them directly and use them immediately. Because each password is paired with the exact website it was used on, attackers do not need to guess where to try logging in. They can simply feed the list into automated tools and attempt to log into the matching site for every single entry.

What Was Exposed in the LeakBase 15Kk ULP #3 Dump

• Email addresses
• Plaintext passwords
• Homepage URLs (the site each login belongs to)

Why This Matters for Anyone in This Dataset

With 1.8 million ready-to-use logins in circulation, this data is prime material for credential stuffing, where attackers automatically test stolen username and password pairs against the sites they were taken from and against other popular services, since many people reuse passwords. Anyone whose credentials appear here faces a real risk of account takeover, financial fraud if the credentials touch a banking or shopping site, and identity theft if the compromised account holds personal information.

How a Stealer Log Like This Gets Created

This is a stealer log, meaning the credentials were not taken from a single company's database but harvested directly from infected computers using information stealing malware. Once installed, this malware quietly captures every username and password a victim types or has saved in their browser, along with the website address it was used on, and sends that data back to the attacker. Logs from many infected machines are then combined into massive files like this one and sold or shared on hacking forums, which is exactly how this dataset surfaced.

Check If You Are Affected by the LeakBase 15Kk ULP #3 Dump

If you suspect your device may have been infected with malware or you simply want peace of mind, it is worth checking whether your email address appears in this dump or others like it. HEROIC's free breach scanner searches a database of more than 400 billion leaked records to show you if your information has appeared in this breach or any other. Run a free scan today to check your exposure.