Monster Cloud Free 12 Leak Has More Records Than Most Small Town Populations

HEROIC analysts identified a stealer log posted to Telegram on November 1, 2023 containing 17,119 records connected to a service called Monster Cloud Free 12. The exposed data included email adresses, plaintext passwords, and URLs, a combination that gives attackers direct access to cloud accounts without any additional cracking or guessing. The log surfaced in a Telegram channel that our threat monitoring systems track regularly, and the density of credentials pointing to a single service flagged it as a priority review.

Why This Is Dangerous

At 17,119 records, this leak is larger than the entire population of many small American towns. Every single one of those records represents a real person whose cloud account credentials are now in the hands of anyone who downloaded that Telegram file. Because passwords were stored and leaked in plaintext, there is no technical barrier for attackers. They can load these credentials directly into automated tools and begin testing them against email providers, corporate logins, banking apps, and other cloud services within minuts of downloading the file.

What Was Exposed

• Email addresses linked to Monster Cloud Free 12 accounts
• Plaintext passwords (unencrypted, ready to use)
• URLs including API endpoints and cloud service addresses
• Total records: 17,119
• Date first seen: November 1, 2023
• Distribution channel: Telegram

Why This Matters

Cloud service credentials are among the most valuable data in any breach. Unlike a leaked home address or even a credit card number, cloud login credentials give attackers active, real-time access to systems, storage, communications, and connected services. For businesses, a single compromised cloud account can lead to data theft, ransomware deployment, or full account takeover. The Monster Cloud Free 12 leak is part of a broader wave of stealer log activity that has been accelerating since mid-2023, with Telegram serving as the primary distribution channel.

How Stealer Logs Work

Stealer malware infects a computer silently, usually through a phishing email, a fake browser extension, or a pirated software download. Once installed, it collects every saved password, cookie, and form field it can find, then packages everything into a structured log file and sends it to the attacker. The attacker then reviews the log, sorts credentials by service type, and either sells the data or posts it publicly on dark web forums and Telegram channels. The Monster Cloud Free 12 data appears to have gone the public Telegram route, making it widely acesible.

Check If You Are Affected

HEROIC's free breach scanner has indexed more than 400 billion leaked records, including stealer log datasets like this one. Type your email address into the scanner to find out if your information appeared in the Monster Cloud Free 12 leak or any other known data breach. If your email appears, change your password right away and turn on two-factor authentication everywhere you use the same credentials.