Malware Harvested 541 Passwords in RussLyon.com Data Breach

RussLyon.com Stealer Log Exposes 541 Records

In June 2026, HEROIC analysts identified a stealer log file uploaded to Telegram that exposed 541 records tied to russlyon.com. The file surfaced on 10 June 2026 and contains email addresses, plaintext passwords, and the URLs those credentials were entered on, all pulled directly from infected devices.

Why This Stealer Log Is Dangerous

This data was not stolen from a company's servers, it was harvested one device at a time by malware that silently ran in the background and copied what people typed. Because the passwords are stored in plaintext and matched to the exact login URLs they were used on, an attacker does not need to crack or guess anything, they can log straight in.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs associated with the logins

Why This Matters

Plaintext passwords tied to login URLs are exactly the kind of data used in credential stuffing and account takeover. If any of the 541 people in this dump reused their password on other accounts, such as email, banking, or shopping sites, an attacker could use this leaked password to break into those accounts too.

How Stealer Logs Work

Stealer logs are produced by infostealer malware, malicious software that typically slips onto a device through a phishing link, a fake download, or a cracked piece of software. Once installed, it quietly copies everything saved in the browser: usernames, passwords, cookies, and autofill data. Criminals then package that stolen information into a log file and sell or trade it on Telegram channels and dark web forums, which is how this russlyon.com data surfaced.

Check If You Are Affected

To find out if your information is part of this leak or any other, run HEROIC's free breach scanner. It checks your email address against a database of more than 400 billion leaked records, including stealer logs like this one, so you can quickly see if your credentials need to be changed.