Inside LeakBase 10Kk ULP: How Malware Harvested 2.5M Passwords

HEROIC analysts identified a stealer log named "10Kk Url:log:pass" circulating on a well-known hacking forum around May 21, 2024. The listing claimed roughly 10 million lines of stolen data, which narrowed down to 2,485,138 unique records once duplicates were removed. Each record paired an email address with a plaintext password and the homepage URL where that login was used.

Why the LeakBase 10Kk ULP Leak Is Dangerous

These are not hashed passwords sitting in a locked database. They are plaintext credentials pulled directly from infected devices, meaning anyone who gets hold of this file can log in with them immediately, with no cracking required. The homepage URL attached to each record tells an attacker exactly which site or service the login unlocks, turning a raw list of stolen data into a ready-made map for account takeover.

What Was Exposed in the LeakBase 10Kk ULP Log

• Email addresses
• Plaintext passwords
• Homepage URLs tied to each login

Why This Matters for Anyone Reusing Passwords

With 2.5 million working email and password pairs now circulating, attackers can automate attempts against banking sites, email providers, and shopping accounts, a tactic known as credential stuffing. Because so many people reuse the same password across multiple sites, one exposed login often opens the door to several other accounts, leading to account takeover, identity theft, and financial fraud.

How Stealer Malware Harvests Passwords Like These

Stealer logs like this one come from malware quietly installed on a victim's device, usually disguised as a cracked program, pirated game, or a malicious email attachment. Once running, the malware scans the browser for saved passwords, autofill entries, and stored login sessions, then packages everything into a file and sends it back to the attacker. That file is what eventually surfaces on hacking forums, exactly as happened with this 10Kk ULP log.

Check If You Are Affected

If you have reused a password across more than one account, it is worth checking whether your information appears in this leak. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including logs like this one, so you can find out in about a minute whether you need to change your passwords.