EU Users Targeted: 40K Mailaccess Combo Exposes Passwords

HEROIC uncovered a credential dump titled "40K Mailaccess EU Combo" on Telegram, originally shared in January 2023. Targeting European mail access accounts, this stealer log contains 35,362 records—each pairing an email address with a plaintext password and the URL of the service where the credential was captured by malware.

Exposed in Plaintext: The Most Dangerous Kind of Password Leak

When passwords are leaked in plaintext, there is nothing standing between the attacker and your account. No brute-force cracking, no rainbow tables, no computational effort. The credentials in this EU-focused combo list are ready to use the moment someone opens the file, making immediate exploitation not just possible but likely.

What Was Exposed

• Email Addresses – European mail accounts that double as login credentials for many online services
• Plaintext Passwords – Completely unencrypted, readable passwords for each account
• URLs – The specific web services and login portals where credentials were stolen

Password Reuse: A Single Combo Unlocks Multiple Accounts

This combo list is designed for credential stuffing—automated attacks that test each email-password pair against dozens of services simultaneously. European users who share the same password between their email provider, banking portal, e-commerce sites, and social media accounts are particularly vulnerable. One successful match can trigger a chain reaction of compromised accounts.

How Infostealer Malware Built This Combo List

Combo lists like this one are assembled from stealer log data—the output of infostealer malware infections. Programs such as RedLine, Vidar, and Stealc infect devices through phishing emails, fake software installers, and compromised websites. They silently extract browser-saved passwords, session cookies, and autofill data, then transmit everything to the attacker. The stolen credentials are organized into combo lists and circulated through Telegram channels and underground forums.

Check If Your Credentials Were Exposed

If you use a European email provider or maintain accounts on EU-based services, your credentials may be in this dump. HEROIC's breach scanner covers more than 400 billion records from data breaches, stealer logs, and dark web leaks. Search your email now to find out if your account was compromised in the 40K Mailaccess EU Combo leak or any other known breach.