If You Shop Online, the 390K Super Mix Leak Should Worry You

HEROIC analysts identified a combolist file circulating on Telegram named “390K SUPER MIX SHopping USA And EU.” The file surfaced on March 17, 2023 and contains 382,661 records pairing login credentials with plaintext passwords, along with the URLs of the sites each login was meant to unlock. The file's label indicates it was curated specifically around shopping accounts across the United States and Europe, meaning the URLs inside likely point to e-commerce and retail platforms.

Why a Shopping-Focused Combolist Is Dangerous

Shopping accounts often have saved payment methods, stored addresses, and loyalty point balances attached to them. Because every password in this file is stored in plaintext, anyone who downloads the list can read and use each credential immediately, with no cracking or decrypting required. Combined with the target URLs included in the file, an attacker does not need to guess where to try a stolen login. The file tells them exactly where to go.

What Was Exposed

• Email addresses tied to the accounts in this file, usable to identify and target victims directly.
• Plaintext passwords, stored and shared with no encryption, meaning anyone who obtains the file can read them instantly.
• URLs showing exactly which site or service each credential pair unlocks, making it trivial for an attacker to know where to try each login.

Why This Matters for Online Shoppers

Attackers who focus on retail logins are usually after two things: stored payment details they can abuse directly, and loyalty or gift card balances they can drain and resell. The core risk with any combolist is credential stuffing: automated tools that take every email and password pair and try it against dozens of popular websites in seconds. If you have ever reused a password across more than one account, and most people have, a single leaked line here can lead to a compromised email account, drained loyalty points, hijacked social media, or worse.

How Retail-Focused Combolists Get Built

Combolists are the underground economy's recycling bin: old and new stolen credentials, pulled from breaches, phishing kits, and malware logs, get merged into a single file and passed around Telegram channels and forums. They are cheap to produce and cost attackers almost nothing to test, which is why they remain one of the most common commodities in the cybercrime marketplace.

Once a combolist is in circulation, automated tools run through every entry against major websites, checking which logins still work. This is called credential stuffing, and it succeeds far more often than it should, because so many people reuse passwords across multiple accounts.

Check If You Are Affected

The safest move after any exposure like this is to find out quickly whether your own information is part of it. HEROIC's free breach scanner checks your email address against a database of more than 400 billion breached and leaked records, including combolists, stealer logs, and other underground dumps like this one. If a match turns up, change the affected password immediately, enable multi-factor authentication wherever it is offered, and avoid reusing that password anywhere else.