Search Your Email: The LeakBase 15Kk ULP #2 Exposed 4M Accounts

HEROIC found the LeakBase 15Kk ULP #2 by firegoon stealer log dated March 2024, exposing 3,966,024 records including email addresses, plaintext passwords, and homepage URLs from infected machines whose credentials were harvested by infostealer malware and posted to an underground hacking forum as a second installment from this threat actor.

Why the LeakBase 15Kk ULP #2 Breach Is Dangerous

With nearly 4 million plaintext password and email pairs now freely circulating on criminal forums, attackers can launch immediate credential stuffing campaigns against banking sites, email providers, and social media platforms. The included homepage URLs reveal which sites were active on each compromised machine, letting criminals prioritize their targets. This being the second in a series suggests an ongoing campaign with a high volume of stolen credentials from across the web.

What Was Exposed in the LeakBase 15Kk ULP #2 Leak

• Email addresses
• Plaintext passwords
• Homepage URLs

Why This LeakBase 15Kk ULP #2 Data Puts You at Risk

Plaintext passwords require no cracking, giving attackers immediate access to any account where these credentials are reused. Automated tools can test these email and password pairs across hundreds of platforms in minutes. If you reuse passwords across sites, every account sharing that credential is now exposed to takeover, fraud, and identity theft.

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 #2 by firegoon log or thousands of other breaches in our database.