Your Data May Be Exposed: The Outlook.de Stealer Log Leaked 274 Logins

A Small but Active Stealer Log Tied to Outlook.de Accounts Surfaced on Telegram

HEROIC analysts identified a stealer log uploaded to a Telegram channel on 29 June 2026. The file contained 274 records tied to outlook.de email accounts, including email addresses, plaintext passwords, and the URLs of the login pages where those credentials were captured. It is a small file compared to some of the mass leaks HEROIC tracks, but the data inside it is exactly the kind that criminals look for first: working logins captured straight off an infected device.

Why This Is Dangerous

Unlike an old database dump that may contain years-old passwords, a stealer log comes from malware that was actively running on someone's computer, recording credentials as they were typed. That makes the 274 accounts in this file more likely to still be valid right now. An attacker does not need to crack or guess anything. They can take an email and password pair straight from the log and try logging in immediately.

What Was Exposed

• Email addresses (outlook.de accounts)
• Plaintext passwords
• URLs of the login pages tied to each credential

Why This Matters

Email accounts are often the master key to a person's digital life. If someone can log into your inbox, they can reset passwords on your banking, shopping, and social media accounts, request password reset links, and quietly take over one account after another. If any of the 274 people in this log reused their outlook.de password anywhere else, that reuse hands an attacker a direct path into those accounts too, a technique known as credential stuffing. From there, identity theft and financial fraud are just a few clicks away.

How Stealer Logs Work

A stealer log is produced by information-stealing malware that infects a device, often through a cracked software download, a fake browser update, or a malicious attachment. Once running, the malware quietly pulls saved passwords, autofill entries, and active browser sessions and packages them into a text file. These files, called logs, are then traded or given away for free on Telegram channels and dark web forums, where other criminals sort through them looking for accounts worth targeting. Because the data is pulled directly from the victim's own browser at the time of infection, stealer logs tend to be more current and more reliable than older leaked databases.

Check If You Are Affected

If you use an outlook.de email address or have reused a password across multiple accounts, it is worth checking whether your information has surfaced in this or any other leak. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, and tells you right away if you have been exposed. Run a free scan now to see where you stand.