How MAIL ACCESS 24K MIX DOMAIN VALID 100 Leak Exposed 20,616 Passwords

MAIL ACCESS 24K MIX DOMAIN VALID 100: What HEROIC Analysts Found

On 10-Jun-2026, HEROIC analysts flagged a new stealer log titled "MAIL ACCESS 24K MIX DOMAIN VALID 100" after it surfaced in a Telegram channel used to distribute malware-harvested credentials. The file contains 20,616 records, each linking an email address to a plaintext password and the exact web address where that login was captured. The "mix domain" label in the file's name reflects what analysts found inside: logins spanning dozens of different websites and services, all pulled from the same group of infected devices rather than a single company's database.

Why This Is Dangerous

Every credential in this file is stored as plain, readable text, so there is no encryption for an attacker to break through. Anyone who downloads the log can immediately try each email and password pair on the matching URL and log straight into the account. Because the passwords were harvested directly from victims' browsers, they are the real, current passwords people were using at the time of infection, not old or outdated logins.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs identifying the exact site or service tied to each login

Why This Matters

With 20,616 working logins spread across many different domains, this file is a ready-made toolkit for credential stuffing. Attackers feed lists like this into automated scripts that test the same email and password on banking sites, email providers, and social platforms in bulk. Anyone caught in this leak faces a real risk of account takeover, financial fraud, or identity theft, especially if the exposed password is reused anywhere else online.

How This Stealer Log Was Built

Stealer logs like this one come from information-stealing malware, software quietly installed on a victim's computer through a fake download, pirated program, or malicious attachment. Once running, it scans the browser for saved logins, autofill entries, and active sessions, then bundles everything it finds into a single file. The mixed collection of domains in this log is typical of that process: the malware doesn't target one website, it grabs every credential stored on the infected device and hands the entire haul to whoever controls it.

Check If You Are Affected

If your email address is among the 20,616 records in this file, you likely won't get a notification from the affected websites themselves. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, so you can find out immediately and change any exposed passwords before they're used against you. Run a free scan now to check your exposure.