Email Providers in the Crosshairs: NINHO Hotmail Leak Hits 750

What HEROIC Analysts Found

On 07-Jul-2026, HEROIC's dark web monitoring team identified another stealer log from the same uploader, posted to Telegram as "NINHO PRIVATE HOTMAIL uploaded by a Telegram User." The file contained 750 records, each pairing an email address with a plaintext password and the URL of the site that login was captured on.

Why Webmail-Focused Leaks Like This Are Dangerous

Free webmail providers like Hotmail are a favorite target for attackers because a single inbox often holds years of account confirmations, password reset emails, and personal correspondence. With 750 plaintext logins specifically tied to Hotmail-linked accounts, an attacker gains not just email access but a paper trail of every other service each victim has ever signed up for.

What Was Exposed in This Leak

• Email addresses tied to Hotmail-linked accounts
• Plaintext passwords captured directly from infected devices
• URLs showing exactly which sites each login unlocks

Why This Matters for Affected Users

Because webmail accounts sit at the center of so many other logins, this leak carries risks well beyond the 750 accounts listed directly. Credential stuffing against the exposed passwords, plus the account takeover risk of losing control of an email inbox, can quickly cascade into banking, shopping, or social media accounts tied to the same address.

How Stealer Logs Work

Infostealer malware infects a device through a malicious download or fake attachment, then quietly copies saved passwords and autofill entries from the browser without the victim noticing anything unusual. Attackers frequently target webmail providers specifically when building these logs, since email access is one of the most valuable footholds a stolen credential set can provide.

Check If You Are Affected

Since your inbox can be the key to nearly every other account you own, it's worth checking whether your email shows up in a leak like this. HEROIC's free breach scanner searches more than 400 billion leaked records, including stealer logs like this one, so you can find out in seconds and lock down your accounts before someone else gets in first.