LeakBase 20Kk ULP: 3.6 Million Stolen Login Credentials Exposed

HEROIC analysts identified a stealer log titled "20Kk Url:log:pass" circulating on a known hacking forum on April 20, 2024. Cataloged as LeakBase 20Kk ULP (Part 2) and attributed to the actor "firegoon," the log contained 3,648,040 unique records combining email addresses, homepage URLs, and plaintext passwords pulled directly from infected devices.

Why Plaintext Passwords Make This Leak So Dangerous

Unlike breaches where passwords are hashed or encrypted, this log stores every password in plaintext. That means anyone who gets a copy of the file can read your password exactly as you typed it, no cracking required. Paired with the homepage URL for each entry, an attacker can see which site a password belongs to and try it there immediately.

What Was Exposed in the LeakBase 20Kk ULP Dump

• Email addresses
• Homepage URLs (the sites each credential pair was captured from)
• Plaintext passwords

Why This Matters for Anyone Who Reuses Passwords

Because the log links each password directly to the site it was used on, it hands attackers a ready-made list for credential stuffing: automatically testing the same email and password combination across banking, email, and shopping sites. If you have ever reused a password across accounts, a single exposed credential here can lead to account takeover, identity theft, or financial fraud on services you never realized were connected to this breach.

How Stealer Log Dumps Like This One Are Built

This data did not come from a hacked company database. It came from infostealer malware, malicious software that infects a person's computer and quietly copies saved passwords, browser autofill data, and login pages straight from the browser. Criminals collect these logs from thousands of infected machines and bundle them into massive files like this one, then sell or share them on forums. That is why the records here span many different websites instead of a single service.

Check If You Are Affected

With 3.6 million credential pairs exposed in this single dump, there is a real chance your email address is included. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, so you can find out quickly and start resetting any passwords that show up.