U.S. Users Hit Hard: SunCloud Exposes 3,988,999 Passwords

HEROIC identified a large-scale stealer log archive labeled SunCloudNew 1243 being distributed on Telegram in June 2026. The collection contains 3,988,999 compromised credential records predominantly linked to United States-based users, making it a significant threat to nearly four million individuals whose login data is now publicly accessible to cybercriminals.

Nearly 4 Million Plaintext Passwords Exposed

All passwords in the SunCloudNew dump are stored in plaintext, meaning they were captured in their exact original form without any cryptographic protection. At nearly four million records, this represents an enormous volume of credentials that require zero processing to exploit. Any attacker who accesses this data can begin login attempts instantly, putting millions of accounts in immediate jeopardy.

What Was Exposed

• Email Addresses — nearly 4 million personal and business email accounts now available for credential attacks and phishing
• Plaintext Passwords — unencrypted credentials extracted directly from victims' browsers, ready for immediate use
• URLs — the specific services, banking sites, and applications where each stolen credential was originally entered

At This Scale, Credential Stuffing Becomes a Numbers Game

Nearly four million credential pairs provide attackers with overwhelming statistical advantage. Automated credential stuffing tools will test each combination against popular services like Gmail, Outlook, PayPal, Amazon, and corporate VPNs. With password reuse affecting the majority of internet users, this volume virtually guarantees hundreds of thousands of successful unauthorized logins across financial, healthcare, and enterprise platforms.

The Infostealer Malware Behind SunCloud

The SunCloudNew collection was assembled from credentials harvested by infostealer malware infecting devices through deceptive downloads, cracked software, and phishing links. These programs silently extract all browser-stored passwords, session cookies, and autofill data from compromised machines. The stolen credentials are then aggregated, organized by domain and credential pair, and uploaded to Telegram channels where they are freely distributed to a global audience of threat actors.

Check If Your Credentials Were Exposed

At nearly 4 million records, the chances of your data being in this dump are real. HEROIC's breach scanner indexes over 400 billion compromised records and can instantly tell you if your email or password appeared in the SunCloudNew collection or any other known breach. Search now and secure your accounts before criminals do.