99k Hotmail Leak: 97,820 Logins Risk a Wider Account Takeover Chain

In March 2023, a Telegram user uploaded a stealer log dataset labeled "99k hotmail.base," exposing 97,820 records built around Hotmail-linked email addresses. The file includes email addresses, plaintext passwords, and URLs, all pulled from malware-infected devices. This is not a breach of Microsoft's Hotmail or Outlook systems. It is a stealer log compiled from individually infected computers and later filtered down to accounts using a hotmail.com address.

Why a Hotmail Password Leak Turns Into a Chain Reaction

An email address is more than just an inbox. It is usually the master key attackers use to reset passwords on banking apps, shopping accounts, and social media. When a Hotmail login shows up in a leak like this one, the risk rarely stays contained to that one inbox. If the same password was reused anywhere else, or if that Hotmail address is the recovery email for other accounts, one exposed login can chain into several compromised accounts in a matter of minutes.

What Was Exposed in the 99k hotmail.base Leak

• Email addresses (hotmail.com accounts)
• Plaintext passwords
• URLs linked to each account

Why This Matters Beyond Your Inbox

Because these passwords are stored in plaintext, they are usable the moment a criminal downloads the file, with no cracking needed. Attackers commonly test leaked email and password pairs against dozens of other services in a process called credential stuffing. A single reused password can lead to email takeover, identity theft, or fraudulent charges on any account that trusts your Hotmail address for verification or password recovery.

How a Stealer Log Like This Gets Filtered Down to One Provider

Stealer malware infects a device, usually through a pirated download or malicious attachment, and copies every saved password and browsing session out of the browser. Criminals then sort the stolen data by email domain, pulling out everything ending in hotmail.com to create a focused list like this one. These filtered lists are attractive to attackers because they can target a single, familiar email provider rather than sorting through a mixed batch of unrelated accounts.

Check If Your Hotmail Account Was Exposed

If you use a Hotmail or Outlook email address, it is worth checking whether it appears in this leak or any other breach. HEROIC's free breach scanner searches more than 400 billion leaked records and tells you instantly if your information has been exposed. Run a free scan now and change any reused passwords before they are used against you.