How Malware Led to 1,130 Stolen Hotmail Logins on Telegram

HEROIC analysts traced a stealer log file labeled "Hotmail" that appeared on a Telegram channel in May 2026. The file contains 1,130 records stolen from infected devices, each pairing a Hotmail email address with its plaintext password and the URL where the login was captured. The data primarily affects users in the United States and represents credentials harvested by infostealer malware operating undetected on victims' machines.

Why Plaintext Hotmail Passwords Create a Chain Reaction

Every password in this dump is stored in plaintext, requiring no decryption or cracking to exploit. For Hotmail users, this is especially dangerous because Microsoft email accounts often serve as recovery addresses for dozens of other services. An attacker who gains access to your Hotmail inbox can reset passwords on banking sites, social media platforms, and cloud storage accounts.

Plaintext exposure also strips away any ambiguity about the exact characters in your password. Even if you use a moderately complex password, its plaintext form allows attackers to identify patterns and variations you may use elsewhere, extending the threat beyond the accounts directly included in this dump.

What Was Exposed in the Hotmail Dump

• Email Addresses — Hotmail accounts used as primary login identifiers
• Plaintext Passwords — Unencrypted credentials ready for immediate exploitation
• URLs — Websites and services where each credential was entered by the victim

Why 1,130 Compromised Accounts Trigger a Domino Effect

Email accounts are the master key to most people's digital lives. When a Hotmail password is compromised, attackers gain access not just to email correspondence but to password reset flows for every service linked to that address. A single stolen Hotmail credential can unlock a chain of accounts spanning e-commerce, healthcare portals, and financial services.

Credential stuffing tools make this process effortless. Attackers feed the 1,130 email-password pairs into automated scripts that test each combination across major platforms. With password reuse rates exceeding 60% among average users, even this modestly sized dump can yield significant unauthorized access.

How Stealer Logs Turned Hotmail Inboxes Into Targets

This dataset was created by infostealer malware, which infiltrates computers through phishing emails, trojanized downloads, and compromised websites. Once installed, the malware silently extracts saved credentials from browsers, targeting stored passwords for email providers like Hotmail with particular effectiveness.

The stolen data is packaged into structured log files and uploaded to command-and-control infrastructure. From there, threat actors distribute the logs through underground markets and messaging platforms like Telegram, where they reach a wide audience of cybercriminals within hours of being posted.

Most victims never realize their credentials were stolen until they experience suspicious login attempts, locked accounts, or unauthorized transactions. The delay between infection and discovery gives attackers a significant window to exploit the stolen data.

Check If Your Hotmail Credentials Were Exposed

If you use or have ever used a Hotmail account, your credentials may be circulating in stealer log datasets like this one. HEROIC provides a free breach scanner that checks your email against more than 400 billion compromised records from known data exposures.

Search your Hotmail address with the HEROIC breach scanner to see if it appears in any known leaks. If your account is found, change your Hotmail password immediately, enable two-factor authentication on your Microsoft account, and review the recovery settings for every service that uses your Hotmail address for password resets.