US Stealer Log Leak Exposes 1.1M Passwords From UP_KURZL0G

In October 2025, HEROIC analysts identified a fresh stealer log file circulating on Telegram, cataloged as ULP FRESH LIVE-TRAFFIC ULP UP_KURZL0G 01-10-2025 28. The log exposed 1,105,383 records tied primarily to United States internet users, including email addresses, plaintext passwords, and the URLs of the sites those credentials unlock.

Why a US-Focused Credential Dump Is Dangerous

This particular log skews heavily toward accounts registered from the United States, which makes it especially attractive to attackers who specialize in targeting US banks, retailers, and payroll systems. Because the passwords are stored in plaintext and paired directly with the website they belong to, a criminal doesn't need to guess or crack anything. They can log straight into an account the moment they open the file.

Why Region Matters to Attackers

Fraud rings often organize stolen credentials by country because it lets them focus on the financial institutions, tax systems, and shopping platforms unique to that region. A US-heavy log like this one is routinely resold or traded specifically because it maps so cleanly onto American billing addresses, US-based two-factor recovery questions, and dollar-denominated accounts.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the websites and services tied to each login

Why This Matters for Everyday Users

When plaintext passwords are combined with the exact URL they were used on, attackers can skip credential guessing entirely and move straight to account takeover. If you reuse a password across multiple sites, one leaked combo can unlock your email, banking, or social media accounts in a chain reaction. This is the exact mechanism behind most credential stuffing attacks and a large share of identity theft and financial fraud cases reported each year.

How a Stealer Log Actually Works

A stealer log is generated by malware quietly installed on a victim's computer, often hidden inside a cracked game, pirated software, or a malicious email attachment. Once running, the malware reads through saved browser passwords, autofill data, and even session cookies, then bundles everything it finds into a single text file. That file is uploaded to a Telegram channel like the one behind this leak, where it's given away or sold to anyone willing to pay a few dollers.

Check If You Are Affected

If you live in the United States or have accounts tied to US-based services, it's worth checking whether your information showed up in this log or one of the thousands like it. HEROIC's free breach scanner searches a database of more than 400 billion leaked records to tell you instantly if your email or password has been exposed. Taking two minutes to check now is a lot cheaper than dealing with a hijacked account later.