500_Valid_Domainstore Leak: 500 Emails, Passwords Found on Telegram

HEROIC analysts identified a combolist uploaded to a Telegram channel in February 2024 containing 500 records of email addresses paired with plaintext passwords and associated URLs. Unlike large corporate breaches, this file is a modest but real collection of working credentials compiled and shared for free among cybercriminals on Telegram. Why This Is Dangerous: Because the passwords in this file are stored in plaintext, anyone who downloads it can immediately try each email and password pair against major websites and services. There is no encryption to crack and no extra step required. The credentials are ready to use the moment someone pulls them from the file. What Was Exposed: - Email addresses - Plaintext passwords - URLs tied to the accounts Why This Matters: Even a small combolist like this one feeds directly into automated credential stuffing tools that criminals use to test stolen logins against banking sites, email providers, and social media platforms. If you reused a password from this leak anywhere else, that account is at risk too. A single reused password can lead to email takeover, financial fraud, or identity theft, even when the original leak affected only a few hundred people. How a Combolist Like This Works: A combolist is a plain text file that pairs usernames or email addresses with passwords, usually compiled from smaller breaches, stealer logs, or older leaks and combined into one list. Criminals upload these files to Telegram channels and forums to share or sell to other attackers, who then run them through automated login tools to see which credentials still work. Because combolists mix data from many sources, a password from this file can also show up on breaches you have never heard of. Check If You Are Affected: You can check whether your email address appears in this leak or in any of the other breaches HEROIC has indexed by running a free scan against HEROIC's database of more than 400 billion breached records. If your credentials show up, change that password immediately and update it anywhere else you may have reused it.