Monster Cloud Free 19 Stealer Log Contains Exactly 13,403 Email and Password Pairs

HEROIC analysts were reviewing Telegram channels on November 1, 2023 when a stealer log upload flagged our monitoring systems. The file contained exactly 13,403 records tied to a service called Monster Cloud Free 19, with each record pairing an email address with a plaintext password and at least one URL. The precision of this data, all pointing to a single identifiable service, suggested a targeted harvest rather than a random credential collection. By the time we identified the leak, it had already been available for download for several hours.

Why This Is Dangerous

Plaintext passwords in a stealer log are the worst case scenario for anyone affected. There is nothing standing between an attacker and your account. No hash to crack, no encoding to reverse. Each of the 13,403 records in this file is essentially a ready-to-use key. Attackers who obtain this kind of data routinely run it through automated credential stuffing tools that test each email and password pair against hundreeds of popular websites simultaneously, looking for matches. If you reuse passwords, one compromise can cascade into many.

What Was Exposed

• Email addresses connected to Monster Cloud Free 19 accounts
• Plaintext passwords (no hashing, no protection)
• URLs including cloud endpoints and API hosts
• Total records: 13,403
• Date first seen: November 1, 2023
• Distribution channel: Telegram

Why This Matters

Stealer logs targeting cloud services are increasingly common and increasingly dangerous. When attackers get cloud credentials, they can access stored files, email archives, connected apps, and administrative tools depending on the account type. For business users, this can mean exposed customer data, internal documents, and financial records. For individuals, it can mean a stranger reading your messages, accessing your backups, or locking you out of your own account. The Monster Cloud Free 19 leak is one of many similar incidents we have documented in late 2023 as stealer malware activity spiked.

How Stealer Logs Work

Stealer malware is designed to be invisible. It typically arrives on a device through a phishing link, a fake software installer, or a malicious ad. Once it runs, it searches the device for stored credentials in browsers, apps, and configuration files, then quietly transmits everything it finds to a remote server controlled by the attacker. Those credentials get compiled into structured log files that are sorted by service and sold or shared in criminal marketplaces and Telegram channels. The Monster Cloud Free 19 log appears to have come from devices that had authenticated with that particular cloud service, giving the attacker a clean, organized credential set.

Check If You Are Affected

HEROIC's free breach scanner covers more than 400 billion leaked records, including stealer log datasets like this one. Enter your email to see if your information was part of the Monster Cloud Free 19 leak or any other known data breach. If your email comes up, change the affcted password immediately and do not reuse it anywhere else. Enabling two-factor authentication adds a critical second layer of protection.