The LeakBase 15Kk ULP #1 Breach: Someone May Access Your Accounts

HEROIC found the LeakBase 15Kk ULP #1 by firegoon stealer log dated March 2024, exposing 3,388,403 records including email addresses, plaintext passwords, and homepage URLs from infected machines whose credentials were harvested by infostealer malware and shared on an underground hacking forum as the first installment of a two-part series.

Why the LeakBase 15Kk ULP #1 Breach Is Dangerous

This log contains plaintext passwords paired directly with email addresses and homepage URLs, giving attackers an instant credential kit requiring no additional processing. With 3.4 million accounts exposed, criminals can run automated credential stuffing tools against banking portals, email services, and social platforms immediately. The homepage URLs reveal which services were accessed on infected machines, allowing targeted attacks on the most sensitive accounts.

What Was Exposed in the LeakBase 15Kk ULP #1 Leak

• Email addresses
• Plaintext passwords
• Homepage URLs

Why This LeakBase 15Kk ULP #1 Data Puts You at Risk

Plaintext passwords require no cracking, giving attackers immediate access to every account where these credentials are reused. Automated tools can test these pairs across hundreds of platforms simultaneously, compromising accounts in minutes. If you have ever reused a password, this leak puts every account sharing that credential at immediate risk of takeover and fraud.

How Stealer Logs Work

Stealer logs are collections of credentials harvested by infostealer malware installed on victims' devices, often through phishing emails, malicious downloads, or compromised software. The malware silently captures saved passwords, browser cookies, and account credentials before packaging and uploading them to criminal servers. These logs are then sold or shared on underground forums for use in account takeovers and fraud.

Check If Your Data Was Exposed

HEROIC operates one of the world's largest breach databases, covering more than 400 billion leaked records. Use HEROIC's free breach scanner to check if your email address or credentials appeared in the LeakBase 15Kk ULP #1 by firegoon log or thousands of other breaches in our database.