Someone Has Your Password: 5,000 Credentials in China Mail Leak

In May 2026, HEROIC analysts discovered a stealer log file labeled "5K CHINA MAIL ACCESS" being distributed on a Telegram channel. The dataset contains 5,000 compromised records, each exposing an email address linked to Chinese email providers along with a plaintext password and the URL where the credentials were captured. The data was harvested from infected devices through infostealer malware.

Why Plaintext Passwords Mean Immediate Account Takeover

Every credential in this leak is stored in plaintext, giving attackers direct, instant access to the affected accounts. There is no encryption to break and no hashing to reverse. If your email and password are in this file, anyone who downloads it can log into your accounts within seconds.

Chinese email providers such as QQ Mail, 163.com, and Sina Mail are often used as primary accounts for a wide range of services including social media, mobile payments, and e-commerce platforms. A compromised email password from this dump could serve as the starting point for accessing an entire ecosystem of connected accounts and financial services.

What Was Exposed in the 5K China Mail Access Dump

• Email Addresses — Accounts from Chinese email providers used across multiple platforms
• Plaintext Passwords — Fully exposed credentials with zero encryption protection
• URLs — Specific services and websites where each credential was entered

Why 5,000 Exposed Logins Pose a Serious Threat

Each of the 5,000 records in this dump represents a real person whose email credentials are now freely available to cybercriminals. Automated credential stuffing tools can test all 5,000 combinations across hundreds of services in under an hour, hunting for password reuse that lets attackers access additional accounts.

The inclusion of URLs adds a layer of precision that makes these credentials even more dangerous. Attackers do not need to guess where these passwords might work. They can see exactly which services each victim uses and target the highest-value accounts first, whether those are payment platforms, cloud storage services, or business applications.

For users who rely on their Chinese email accounts as the recovery address for international services, the risk extends well beyond regional platforms. A compromised primary email gives attackers the ability to intercept password reset emails for services worldwide.

How Stealer Logs Compromise Email Accounts Without Warning

The credentials in this dump were harvested by infostealer malware that runs invisibly on victims' computers. These programs infiltrate devices through phishing emails, pirated software packages, and malicious downloads disguised as legitimate applications. Once installed, they extract saved passwords from every browser on the system.

The malware operates silently, avoiding detection by antivirus tools through frequent code updates and evasion techniques. Stolen credentials are transmitted to remote servers, where they are organized into log files categorized by geography, email provider, or service type. The "China Mail Access" label indicates this particular compilation was filtered to focus on Chinese email credentials.

Victims typically have no indication that their credentials have been stolen. The malware does not lock files, display warnings, or alter the user experience in any visible way, allowing it to harvest data for weeks or months before the logs are distributed publicly.

Check If Your Credentials Were Exposed

If you use a Chinese email provider or have saved your email password in a web browser, your credentials may be part of this stealer log distribution. HEROIC offers a free breach scanner that searches more than 400 billion compromised records to help you determine whether your data has been exposed.

Run your email through the HEROIC breach scanner to check your status. If your credentials appear in any known breach, immediately change the compromised password and every other account that shares it. Enable two-factor authentication on all critical accounts and begin using a password manager to create unique credentials for every service.