Telegram Stealer Log Leak: 920,688 Passwords Up for Grabs

In October 2025, HEROIC analysts identified a stealer log file circulating on Telegram, uploaded by a single anonymous user. The dump, tagged internally as "BONUS ULP UP_KURZL0G 9," contains 920,688 records harvested directly from infected devices. Each entry pairs a website URL with a plaintext email address and password, giving whoever grabs this file instant, ready-to-use login combos for hundreds of thousands of accounts.

Why This Is Dangerous

Stealer logs are different from a typical corporate breach. Instead of pulling data from one company's database, this file was built from malware quietly running on victims' own computers, recording every username and password typed into a browser. That means the credentials here are current, accurate, and already organized by site, making them immediately useable by anyone who downloads the file.

Because the passwords are stored in plaintext, an attacker does not need to crack or decode anything. They can simply copy, paste, and log in.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the sites each login belongs to

Why This Matters

A combo list like this is a launchpad for credential stuffing, where automated tools test the same email and password pair across banking, email, and shopping sites in secconds. Because so many people reuse passwords, one stolen login can unravel an entire online identity.

From there, attackers pivot to full account takeover, locking out the real owner, draining loyalty points or funds, and using the hijacked accounts to send phishing links to friends and coworkers. Combined with an email address, this data also feeds directly into identity theft and financial fraud schemes.

How Stealer Logs Work

A stealer log comes from infostealer malware, a small program that infects a device through a fake download, cracked software, or malicious email attachment. Once installed, it quietly scans the browser's saved passwords, autofill data, and session cookies, then bundles everything into a text file.

That file, called a "log," is sold or shared in bulk on Telegram channels and dark web forums, often for just a few dollars. Criminals buy these logs in batches and sort through them looking for valuable accounts like banking, email, or corporate logins.

Check If You Are Affected

If you suspect your credentials might be sitting in a log like this one, HEROIC's free breach scanner checks your email against a database of more than 400 billion exposed records. It takes seconds to find out whether your information has surfaced in this or any other known breach, so you can change passwords before someone else uses them first.