The ‘net’ Combolist Leak: 4.5 Million Passwords. Yours Might Be One.

HEROIC analysts identified a massive combolist simply named net, uploaded to a Telegram channel in January 2023. The file contains 4,520,443 records of email addresses, plaintext passwords, and the URLs each login was tied to, making it by far the largest single leak in this batch of Telegram uploads our team reviewed. Why This Is Dangerous: At more than 4.5 million records, this combolist gives attackers an enormous pool of working email and password combinations to test against other services. Scale like this is what powers large, automated credential stuffing campaigns that can hit thousands of accounts in a single run. What Was Exposed in the net Leak: Email addresses. Plaintext passwords. URLs tied to each login. Why This Matters: A leak of this size significantly raises the odds that any one person's credentials, including yours, are included. Because the passwords are stored in plaintext, no extra cracking step is needed before attackers can start testing them against email, banking, and shopping accounts across the internet. How a Combolist This Large Gets Built: Combolists that reach millions of records are typically stitched together from many older breaches and malware infections rather than a single incident, then merged, deduplicated to some degree, and packaged for distribution. The generic name net gives no indication of a single source, which is typical of large aggregate files built purely for volume and resale. Check if You Are Affected: With over 4.5 million records in this one file alone, checking your exposure is one of the highest-value security steps you can take right now. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including this leak, so you can see instantly whether your information is included.