Inside GMX New 0813 Stealer Logs: 13,950 Passwords Harvested

HEROIC discovered a stealer log labeled GMX New 0813 circulating on Telegram in March 2023. The dataset focuses on GMX email service users and contains 13,950 harvested records. Each entry includes the victim's email address, their plaintext password, and the URL where the credentials were captured, providing attackers with a ready-made toolkit for account infiltration.

The Technical Reality of Plaintext Password Exposure

Passwords in this dataset are stored in their original, unprotected form. There is no bcrypt hash, no salting, and no encryption layer standing between the attacker and the credential. This means exploitation is trivial: any individual with access to this file can authenticate as the victim on any service where the password remains active. For GMX email accounts in particular, this grants full inbox access, including the ability to read, send, and delete messages.

What Was Exposed

• Email addresses (primarily GMX accounts)
• Plaintext passwords
• URLs of accessed websites and services

Credential Stuffing at Scale

Cybercriminals feed datasets like GMX New 0813 into automated credential stuffing frameworks that can test thousands of login combinations per minute across multiple platforms. An email provider credential is especially valuable because it often serves as the recovery address for dozens of other accounts. Once attackers control a GMX inbox, they can initiate password resets on banking sites, social media platforms, and cloud storage services tied to that email address.

Anatomy of a Stealer Log Attack

The GMX New 0813 dataset was generated by infostealer malware installed on victims' devices. These programs, often variants of RedLine, Raccoon, or Vidar, hook into browser processes to intercept saved credentials, autofill data, and session cookies in real time. The captured data is structured into logs organized by service, making it easy for attackers to filter for specific targets like GMX accounts. These logs are then sold in bulk or shared freely through Telegram channels and dark web forums.

Check If Your Credentials Were Exposed

HEROIC's breach intelligence platform indexes over 400 billion compromised records. Run your email through the HEROIC breach scanner to discover if your GMX credentials or any other account details appear in the GMX New 0813 stealer log or other known breaches. Immediate password changes and enabling two-factor authentication are critical first steps if your data has been compromised.