The Monster Cloud Free 3 Leak Exposed 3,828 US Cloud Credentials

HEROIC analysts identified the Monster Cloud Free 3 stealer log file in October 2023 after it appeared on a Telegram channel specializing in comprimised credential data. The dump contained 3,828 records tied to endpoints, email accounts, API hosts, and passwords. What distinguished this log from generic mass-harvested stealer data was its targeted focus on a specific cloud service, with a majority of the exposed URLs pointing to cloud infrastructure rather than ordinary consumer websites. The affected accounts showed a strong US-origin footprint based on the endpoint and domain patterns in the leaked data.

Why This Is Dangerous

Cloud credentials are among the most dangerous type of stolen data in circulation. Unlike a leaked social media password, a stolen cloud service credential can give an attacker direct access to file storage, hosted applications, virtual machines, or entire development environments. Monster Cloud Free 3 appears to be a cloud storage or hosting service, and the exposed data includes API host URLs alongside plaintext passwords, meaning attackers who downloaded this log had everything they needed to start accessing cloud-hosted resources immediately. No brute forcing, no cracking, just direct login with stolen details.

What Was Exposed

• Email addresses linked to cloud service accounts
• Plaintext passwords with no protection or hashing
• URLs pointing to API hosts and cloud endpoints
• 3,828 total records from comprimised US-linked machines
• Data surfaced on Telegram on October 22, 2023
• Potentially sensitive API host credentials

Why This Matters

Even free or lower-tier cloud services represent significant risk when credentials are stolen. Employees often use free cloud tools to store work documents, share files, or test applications, meaning a comprimised free cloud account can indirectly expose business data. The US-origin profile of this data also suggests that organizations operating in the United States had employees or systems affected. With 3,828 records available on a Telegram channel, this data was acesible to anyone with a Telegram account, creating widespread opportunitty for account takeover and data theft.

How Stealer Logs Work

Stealer log malware infects computers through phishing links, trojanized software installers, or malicious browser extensions. Once running on a device, the malware scrapes every stored credential it can find: browser saved passwords, cookies, autofill data, and credential files used by apps. It then bundles this data into a structured log file and sends it to the attacker. Cloud-focused stealer campaigns specifically look for credentials stored by cloud sync apps, development tools, and browser sessions that are logged into cloud dashboards. The logs are then sold or posted free on Telegram channels where they are downloaded and acted on quickly.

Check If You Are Affected

If you or anyone in your organization uses cloud services and your device has ever been infected by malware, your credentials may have appeared in a dump like Monster Cloud Free 3 without you ever knowing. HEROIC's free breach scanner checks across more than 400 billion records including stealer log collections, dark web dumps, and credential databases from Telegram and underground markets. A free scan takes seconds and can tell you whether your email or passwords have been exposed in any known breach or log file.