MAIL ACCESS 13K ALL DOMAIN VALID 100 Leak Exposes 12,706 Passwords

HEROIC analysts uncovered a stealer log labeled "MAIL ACCESS 13K ALL DOMAIN VALID 100" being shared by a Telegram user. Dated 23-Oct-2025, the file contains 12,706 records tied to United States users, including email addresses, plaintext passwords, and the URLs of the accounts those passwords open. Its name signals it was marketed as a batch of confirmed, working mail account logins across many different domains.

Why This Mail Access Stealer Log Is Dangerous

A file marketed as "valid" access means someone has already confirmed these logins work before selling or sharing them. That removes the biggest obstacle for an attacker: uncertainty. Instead of guessing which stolen passwords still function, they get a pre-tested list, each one paired with the exact site it opens, ready to use the moment they download the file.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs linked to each set of credentials

Why This Matters

Because the passwords are plaintext and pre-verified, an attacker can log into an email account immediately, without cracking anything or testing whether it still works. Email access is especially risky because inboxes are often the key to resetting passwords on other accounts. If any of the 12,706 exposed logins are still active, an attacker could use that mailbox to trigger password resets elsewhere, turning one stolen login into access for several unrelated accounts, a clear path to broader account takeover.

How Stealer Logs Work

A stealer log is the output of malware that infects a device, quietly copies the usernames, passwords, and site addresses saved in the browser, and sends that data back to whoever is running the malware. Sellers then often verify which logins still work, package the confirmed ones together, and label the file as "valid" to make it more attractive to buyers. These curated files are then shared or sold on platforms like Telegram, where anyone can pick them up ready to use.

Check If You Are Affected

Because this file was marketed as confirmed and working, it's worth checking your own exposure right away. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including stealer logs like this one, and tells you immediately if your information has surfaced. If it has, changing that password and enabling two-factor authentication takes just a few minutes and shuts attackers out before they can use it.