Dark Web Intel: t-online.de Stealer Log Exposes 98,936 Logins

What HEROIC Analysts Found

On 14-May-2026, HEROIC's dark web intelligence team tracked a massive stealer log posted to Telegram under the name "t-online.de uploaded by a Telegram User." This is one of the largest single files HEROIC has cataloged from this uploader, containing 98,936 records, each pairing an email address with a plaintext password and the URL of the site that login was captured on.

Why This t-online.de Stealer Log Is Dangerous

A file with nearly 99,000 records isn't a handful of unlucky victims, it's a large-scale harvest that gives attackers enough volume to run automated attacks across thousands of accounts at once. Because every record already includes the exact site each password belongs to, there's no manual work involved, just software feeding in email, password, and URL combinations until some of them succeed.

What Was Exposed in This Leak

• Email addresses tied to t-online.de-linked accounts
• Plaintext passwords collected from infected devices
• URLs identifying exactly which websites each login unlocks

Why This Matters for Affected Users

With 98,936 plaintext credentials now circulating, this leak is exactly the kind of dataset attackers use for large-scale credential stuffing campaigns. Anyone whose email and password appear in this file faces a serious risk of account takeover, and that risk multiplies for anyone who has reused the same password across other online accounts.

How Stealer Logs Work

Infostealer malware infects a device, often through a malicious download, cracked software, or a booby-trapped attachment, and then silently copies every saved password and autofill entry from the browser. HEROIC's dark web intelligence team monitors the Telegram channels and marketplaces where criminals combine data from thousands of infected devices into single large files like this one before selling or sharing them.

Check If You Are Affected

With nearly 99,000 records in this single log, the odds that your information is included are higher than in most leaks HEROIC tracks. HEROIC's free breach scanner checks your email against more than 400 billion leaked records, including stealer logs like this one, so you can find out immediately and secure any exposed passwords before they're used against you.