Inside the Hotmails Stealer Logs: 2,083 Passwords Harvested

In November 2024, HEROIC's DarkHive threat intelligence platform flagged a stealer log archive labeled "Hotmails" that was uploaded to Telegram. Analysis of the dataset reveals 2,083 compromised records, each containing a Hotmail email address, a plaintext password, and the URL of the service where the credentials were captured by malware.

What Makes Plaintext Credentials So Exploitable

The passwords in this dataset are entirely unencrypted. Every credential appears in readable text, meaning there are no hashing algorithms to reverse and no brute-force computations needed. An attacker opening this file can immediately begin testing credentials against live services. The technical simplicity of exploiting plaintext passwords makes dumps like this among the most dangerous types of credential leaks.

What Was Exposed

• Email Addresses — Hotmail accounts linked to Microsoft services and numerous third-party sites
• Plaintext Passwords — stored in cleartext with no cryptographic protection
• URLs — mapping each credential to the exact website or service where it was intercepted

Credential Stuffing at Scale

Armed with email-password combinations from dumps like Hotmails, attackers deploy credential stuffing tools that can test thousands of login attempts per minute across popular platforms. The URL data included in this leak gives attackers an additional advantage: they know exactly which services the victim uses, allowing them to prioritize high-value targets like financial accounts, email providers, and cloud storage services.

The Technical Anatomy of a Stealer Log

Stealer logs are produced by a category of malware known as infostealers — including variants like RedLine, Raccoon, and Vidar. These programs infiltrate devices through trojanized software, exploit kits, or social engineering attacks. Once executed, they systematically extract credentials stored in browser password managers, session cookies, cryptocurrency wallets, and autofill databases. The exfiltrated data is structured into organized log files, sorted by domain, and uploaded to command-and-control servers or directly to distribution channels like Telegram.

Check If Your Credentials Were Exposed

HEROIC has indexed over 400 billion compromised records from data breaches, stealer logs, and credential dumps worldwide. Use HEROIC's breach scanner to search for your email address and determine whether your credentials appear in the Hotmails leak or any other breach in the database. Knowing your exposure status is the essential first step toward rotating compromised passwords and securing your accounts.