Dark Web Intel: 886,339 Credentials Found in the 936K Best Base Leak

HEROIC analysts examined a file called 936K USA Best Base after it surfaced in a Telegram channel, dated February 28, 2023. Despite the name suggesting 936,000 records, our verification found 886,339 actual records containing email addresses, plaintext passwords, and the URLs each login belongs to. We report the verified number, not the name attached to the file. Why This Is Dangerous: The gap between the file's name and its real size doesn't make it any less dangerous. Every one of the 886,339 verified records still pairs a working email address with a real password and the exact site it unlocks, giving an attacker everything needed to log in directly. What Was Exposed: Each of the 886,339 records in this file contains the same three fields. - Email addresses - Plaintext passwords - URLs identifying the associated login site Why This Matters: A file of this size is large enough to power serious credential stuffing campaigns, where attackers test stolen logins against banking, email, and shopping sites hoping people reused passwords. With nearly 900,000 real credentials in circulation, the risk of account takeover and downstream identity theft is significant for anyone whose data appears here. How a Combolist Like This Works: Combolists like this one are typically built by merging several smaller breaches or stealer logs into one large file, then labeled with an inflated or rounded number to make them sound bigger when advertised on Telegram or dark web forums. The actual working credential count often differs from the marketing name, which is exactly what analysts found here. Check If You Are Affected: Run your email through HEROIC's free breach scanner, checking against more than 400 billion leaked records, to see if you're one of the 886,339 people exposed in this file.