The Atcon.com Leak Exposed 10,923 US Accounts and Passwords

HEROIC analysts found a stealer log tied to atcon.com that a Telegram user uploaded on 10 June 2026. The file held 10,923 records, each one made up of an email address, a plaintext password, and the URL of the login page that password unlocked.

Why This Is Dangerous

This exposure did not come from atcon.com being hacked directly. It came from infostealer malware sitting on infected computers, quietly copying login details as people typed them or as browsers auto filled them. Because the passwords in this file are stored in plaintext, an attacker can read them the moment they open the file, no cracking involved. The matching URL for each entry tells an attacker precisely which site to try each password against.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs tied to each set of stolen credentials

Why This Matters

With 10,923 records in a single file, this is one of the larger stealer logs to surface recently, and the risk scales with the size of the list. Attackers routinely take credentials like these and run them against banking, email, and shopping sites through credential stuffing, betting that people reused a password. Every successful match is a potential account takeover, which can quickly escalate into identity theft or financial fraud for the person whose data was exposed.

How Stealer Logs Work

Infostealer malware infects a device through a malicious download, a compromised file, or a fake application, then silently harvests saved passwords, autofill data, and session cookies straight from the browser. That stolen data is packaged into a log and delivered back to the attacker, usually within hours of the infection. Logs like this one are then sold or freely shared on Telegram, which is exactly how this atcon.com related file ended up circulating.

Check If You Are Affected

If you have ever logged into atcon.com or reuse passwords across your accounts, it is worth checking whether your information appears in this exposure. HEROIC's free breach scanner searches more than 400 billion leaked records so you can confirm your exposure and change any affected password right away.