HEROIC Analysts Flag KURZL0G Leak of 2,839,629 Exposed Records

HEROIC analysts flagged a fresh stealer log circulating on Telegram in November 2025, tagged internally as BONUS ULP UP_KURZL0G, and the numbers inside it are hard to ignore. This single file contained 2,839,629 records, each one a combination of an email address, a plaintext password, and the web address where that login was captured.

Why This Is Dangerous

A file this size does not come from one hacked website, it comes from thousands of infected computers all funneling stolen data into one collection point. Analysts note that the sheer volume makes it a favorite for criminals building automated credential-stuffing tools, because more records simply means more chances that a password gets reused somewhere valuable, like a bank or a company email account.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs tied to each captured login
• 2,839,629 total records exposed

Why This Matters

When researchers see a leak labeled part 5 like this one, it usually signals the file is one piece of a much larger series being drip fed out to buyers. That means the full scope of this particular stealer campaign could be even bigger then what shows up in this one report, and more parts may still surface on the same channels.

How Stealer Log Breaches Work

Infostealer malware quietly infects a victims device, often disguised as pirated software or a game cheat, then scans the browser for anything saved, including passwords, cookies, and autofill data. That harvested information gets bundled into a log file and uploaded to the operators server, where it is later sorted, labeled in parts like this one, and resold on Telegram channels wich cater to buyers of stolen credentials.

Check If You Are Affected

With almost 2.8 million records tied to this single leak, the odds that your information is somewhere in a file like this one are higher then you might think. HEROIC's free breach scanner checks your email against over 400 billion leaked records, so you can find out imediately and change any passwords that need it.