Hotmail Mega Leak: 2,642 Valid Accounts Ready to Steal

In January 2025, HEROIC's threat intelligence team detected a stealer log file titled 2.6K Full Valid Hotmail Hits By Mega 16.01 circulating on Telegram. The critical detail is in the name: "Full Valid" means these 2,642 Hotmail credentials have been tested and confirmed as working logins. Each record includes an email address, a plaintext password, and the URL where the credential was captured, giving attackers a ready-made toolkit for account takeover.

Validated Plaintext Passwords: The Worst-Case Scenario

Not only are these passwords stored in plaintext, but they have been verified as active. This eliminates the usual friction in credential exploitation — attackers do not need to filter out expired or changed passwords. Every credential in this file was confirmed to work at the time of validation, meaning the threat is immediate and concrete. If your Hotmail password has not been changed since January 2025, it is almost certainly still exploitable.

What Was Exposed

• Hotmail email addresses confirmed as active accounts
• Plaintext passwords validated as currently working credentials
• URLs identifying where each credential was originally intercepted

Validated Credentials Supercharge Account Takeovers

When attackers have verified credentials, credential stuffing becomes dramatically more efficient. Instead of testing millions of potentially stale pairs, they work with 2,642 confirmed-working Hotmail logins and run them against banking apps, shopping platforms, workplace systems, and cloud services. Because Hotmail accounts are often used as Microsoft account logins, a single compromised credential can unlock access to OneDrive, Outlook, Teams, and other Microsoft services — multiplying the damage exponentially.

Mega Checker Tools and the Validation Pipeline

The "Mega" in this dump's name refers to credential checker tools that criminals use to validate stolen credentials at scale. After infostealer malware — such as RedLine, Lumma, or Stealc — harvests raw credentials from infected devices, operators run them through automated checkers that test each login against the target service. Only working credentials make it into "Full Valid" collections like this one. This extra step makes these dumps far more dangerous than raw, unfiltered stealer logs.

Check If Your Credentials Were Exposed

If you have a Hotmail or Microsoft account, you need to check whether your credentials are in this validated dump. HEROIC's breach scanner searches over 400 billion compromised records from breaches and stealer log collections worldwide. Enter your email address to find out if you are exposed, then take immediate action: change your Hotmail password, revoke any connected app passwords, and enable Microsoft's two-factor authentication to prevent unauthorized access.