U.S. Users Targeted: OJS_Valid Exposes 541 Passwords

In February 2026, HEROIC identified a stealer log file titled OJS_Valid being distributed on Telegram. The file exposes 541 records targeting users primarily in the United States, containing email addresses paired with plaintext passwords and the URLs where those credentials were used.

The Immediate Danger of Exposed Plaintext Passwords

Plaintext passwords require zero effort to exploit. Unlike hashed or encrypted credentials, these passwords are stored exactly as the user typed them. Any threat actor who obtains this file can immediately attempt to log in to the affected accounts without needing specialized tools or technical expertise.

What Was Exposed

• Email Addresses — personal and professional accounts used as login credentials
• Plaintext Passwords — stored in readable form, ready for immediate misuse
• URLs — specific websites and platforms linked to each stolen credential

How Password Reuse Multiplies the Risk

With 541 exposed credential pairs, attackers have a ready-made list for credential stuffing attacks. Automated tools can test each email-password combination against dozens of major platforms in minutes. If even one victim reused their password across services, the attacker gains access to far more than what OJS_Valid originally compromised—potentially reaching banking portals, cloud storage, and corporate accounts.

Understanding Stealer Log Malware

Stealer logs originate from infostealer malware infections. This type of malware runs silently on a victim's device, extracting saved usernames and passwords from web browsers, FTP clients, and email applications. Once collected, the stolen data is bundled into log files and distributed through underground channels like Telegram, giving cybercriminals widespread access to private credentials.

Check If Your Credentials Were Exposed

Do not wait for suspicious activity to appear on your accounts. HEROIC maintains a breach database with over 400 billion records. Use HEROIC's free breach scanner to search your email address or domain and determine if your credentials were part of the OJS_Valid leak or any other known breach. Change compromised passwords immediately and enable two-factor authentication wherever possible.