SunCloudNew Breach Exposes 387,011 Credentials on the Dark Web

HEROIC's dark web monitoring uncovered a major stealer log collection titled SunCloudNew being actively distributed across underground marketplaces in July 2026. This expansive data set contains 387,011 compromised credential records, representing a significant trove of stolen authentication data harvested from infected devices worldwide.

387,011 Plaintext Passwords: A Massive Exposure Event

The scale of plaintext password exposure in the SunCloudNew breach is alarming. With nearly 400,000 credentials available in unencrypted form, attackers have an enormous arsenal for launching account takeovers across the internet. Plaintext passwords mean there is absolutely no computational barrier between the stolen data and unauthorized account access. Every credential in this collection is immediately weaponizable, and the volume means high-value accounts in finance, healthcare, and enterprise environments are statistically likely to be included.

What Was Exposed

• Email Addresses — nearly 400,000 email accounts serving as login identifiers across countless services
• Plaintext Passwords — hundreds of thousands of unencrypted passwords ready for exploitation
• URLs — the login pages and web services from which each credential was captured by malware

Industrial-Scale Credential Stuffing from This Breach

A breach containing 387,011 credential pairs enables industrial-scale credential stuffing operations. Criminal networks will systematically test these email and password combinations against financial institutions, cloud services, enterprise VPNs, and government portals. At this scale, even a conservative success rate of just one to two percent translates to thousands of compromised accounts, each one potentially yielding financial data, personal information, or a stepping stone to deeper network intrusions.

The SunCloudNew Infostealer Malware Operation

SunCloudNew represents a prolific infostealer malware operation that has compromised devices on a massive scale. The malware behind this collection infiltrates systems through sophisticated distribution networks including malicious advertising, bundled software installers, and exploit kits targeting browser vulnerabilities. Once embedded in a device, it exhaustively collects stored browser credentials, email passwords, FTP configurations, cryptocurrency keys, and active session data, funneling it all into structured logs for monetization on dark web markets.

Check If Your Credentials Were Exposed

HEROIC tracks over 400 billion compromised records from data breaches, stealer logs, and dark web leaks worldwide. Use HEROIC's free breach scanner to check if your email address or password was captured in the SunCloudNew stealer log or any other known data compromise tracked by HEROIC's intelligence platform.