Dark Web Intel: 7,602 T-Online.de Logins Leaked in New Combolist

HEROIC analysts found a combolist labeled "7.000 T-ONLINE.DE" circulating on Telegram, uploaded on October 23, 2024. The file contains 7,602 records, each combining an email address ending in t-online.de with a plaintext password and the URL the credentials unlock. Despite the file's name suggesting 7,000 entries, the actual count analysts verified was 7,602 working credential pairs. Why this is dangerous: every password in this file is stored as plaintext, meaning there is nothing standing between an attacker and a working login. Because the list is specifically built around t-online.de addresses, a widely used German email service, it gives criminals a focused target list rather than a random mix of accounts, making it easier to run automated login attempts efficiently. What was exposed: the dataset contains t-online.de email addresses, the plaintext passwords tied to each one, and the URLs of the services those credentials access, giving attackers everything needed to log in on the first try. Why this matters: email accounts are often the key that unlocks everything else, password resets, two-factor codes, and personal correspondence all flow through them. If someone reuses their t-online.de password elsewhere, this leak could just as easily open the door to their banking or shopping accounts. Criminals commonly run credential stuffing attacks with lists like this, testing each pair against dozens of other sites until something works, which can quickly escalate into account takeover, identity theft, or fraud. How this kind of dark web intel surfaces: combolists like this one are typically assembled from older breaches, malware-infected devices, or phishing campaigns, then sorted by email domain to make them more useful to buyers who want to target a specific provider or country. Once sorted, they are traded quietly in Telegram channels and dark web forums before wider public awareness catches up, which is exactly where HEROIC's monitoring identified this file. Check if you are affected: if you or someone you know uses a t-online.de email address, it is worth checking whether it appears in this leak or any other breach. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, giving you an instant answer so you can change any exposed passwords right away.