If You Reuse Passwords, the Mix 975 Leak Should Worry You

HEROIC analysts discovered a stealer log collection labeled "Mix 975" that was shared on Telegram in June 2026. The file contains 3,956 records pulled from multiple sources, each including an email address, a plaintext password, and the URL of the service where the credential was stolen. The "mix" designation indicates this is a compiled collection of credentials aggregated from various infostealer malware infections rather than a single-source breach.

Mixed stealer logs are particularly dangerous because they contain credentials spanning a wide variety of services and platforms. The 3,956 records in this file likely cover everything from email providers and banking portals to social media accounts and enterprise applications, giving attackers a diverse toolkit for exploitation.

Why Plaintext Passwords in a Mixed Collection Are Especially Threatening

Every password in the Mix 975 file is stored in plaintext — fully readable and immediately usable. When combined with the mixed-source nature of this collection, the result is a ready-made attack kit. Attackers do not need to crack anything or sort through encrypted data. They can begin testing credentials across services the moment they download the file.

The diversity of sources in a mixed log also means these credentials span different geographic regions, email providers, and service types. This breadth makes the collection useful for a wider range of attacks, from targeted phishing campaigns to large-scale automated credential stuffing operations against popular platforms.

What Was Exposed in the Mix 975 Dump

• Email Addresses — Accounts from multiple email providers and services, providing a broad cross-section of potential victims across different platforms and regions.
• Plaintext Passwords — Unencrypted login credentials captured from infected devices worldwide, each one ready for immediate exploitation without any decryption step.
• URLs — The diverse set of websites and services where these credentials were harvested, confirming which platforms each victim actively uses.

Why 3,956 Mixed Credentials Maximize Attack Potential

Mixed stealer logs like Mix 975 are prized by attackers because they offer variety. Instead of being limited to one email provider or one country, the collection spans multiple domains and demographics. This makes it useful for credential stuffing campaigns targeting virtually any popular service.

With over 60% of internet users reusing passwords across accounts, the 3,956 records in this file represent a much larger number of potentially compromised accounts. Each email and password pair will be tested against banks, social media platforms, streaming services, cloud providers, and workplace applications. The mixed nature of the data means attackers can cast a wide net and expect a significant hit rate across diverse target services.

How Mixed Stealer Logs Are Assembled and Distributed

Mixed collections like Mix 975 are assembled by aggregating credentials from multiple individual stealer log infections. Threat actors collect data from their own malware operations or purchase logs from other operators, then compile them into numbered mix files for easy distribution. The numbering system ("975" in this case) suggests an ongoing series of regular compilation and release.

These compiled files are uploaded to Telegram channels where they reach a global audience of cybercriminals. The compilation process often involves deduplicating records and formatting them for easy ingestion by automated attack tools. By the time a mix file reaches Telegram, it is optimized for immediate use in credential stuffing operations, making it one of the most operationally ready forms of stolen data.

Check If Your Credentials Were Exposed

Because mixed stealer logs contain credentials from a wide range of services, anyone could potentially be affected regardless of which email provider or platform they use. HEROIC's free breach scanner checks your email against more than 400 billion compromised records to determine whether your information appears in this collection or any other known breach.

If your credentials are found, change the affected password immediately and update every other account that uses the same login. Adopt a unique password for each service you use, enable two-factor authentication across all critical accounts, and scan your devices for malware to stop any active infostealer from continuing to harvest your credentials.