1.8M Mix Domain Leak Hands Attackers 1.4M Logins: Check Now

1.8M Mix Domain Leak Hands Attackers Over 1.4 Million Logins

On April 9, 2024, HEROIC analysts identified a large stealer log file labeled "1.8M Mix Domain" being shared on Telegram. The file contained 1,420,004 records, each combining an email address, a plaintext password, and the URL the credential was used on. Unlike single-site combo lists, this file pulls together logins from a wide mix of different websites and services, all harvested from the same batch of infected devices.

Why This Is Dangerous

With over 1.4 million plaintext credentials in one file, attackers do not need to crack or guess anything, they can start testing logins immediately across thousands of different websites. Because the data spans many unrelated domains, the same automated attack tools can be pointed at banking portals, email providers, retailers, and social platforms all from one dataset, multiplying the number of accounts at risk.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs identifying which website each login belongs to

Why This Matters

A mixed domain leak of this size is a ready-made toolkit for credential stuffing, where attackers automatically try each stolen email and password pair across hundreds of other sites. Because so many people reuse passwords, a login stolen from one minor website can unlock a person's email, banking, or shopping account elsewhere. At this scale, the risk extends well beyond the original victims, touching anyone who has ever reused one of these 1,420,004 passwords.

How Stealer Logs Work

Mixed domain stealer logs like this one come from infostealer malware quietly running on infected computers, silently copying every saved username and password from the victim's browser regardless of which website it belongs to. Criminals then combine the output from many infected machines into one large file, which explains why a single log can contain over a million records spanning countless unrelated domains, before distributing it through Telegram or dark web forums.

Check If You Are Affected

Given the size and variety of domains in this leak, checking your exposure is a smart step regardless of which sites you use. HEROIC's free breach scanner searches more than 400 billion leaked records, including large mixed domain stealer logs like this one, to tell you if your email address has been compromised. Run a free scan today, and change any passwords that come back as exposed.