Check Your Email: KATANA_CLOUD Leak Exposed 4,117 Passwords

HEROIC analysts identified a stealer log file named KATANA_CLOUD FREE that was uploaded to a Telegram channel on January 4, 2024. The file contains 4,117 records pulled from infected devices, including email addresses, plaintext passwords, and the URLs of the accounts those credentials unlock.

Why This Is Dangerous

Each of these 4,117 records pairs a plaintext password directly with the email address and web address it belongs to. There is no encryption to break and no cracking required. Anyone who obtains this file can log straight into the affected accounts, making this a far more immediate threat than a breach where passwords are hashed.

What Was Exposed in the KATANA_CLOUD Log

• Email addresses
• Plaintext passwords
• URLs of the associated accounts and services

Why This Matters

With 4,117 plaintext password and email pairs now circulating, anyone who reused one of these passwords elsewhere becomes a target for credential stuffing against banking, email, or shopping accounts. That kind of overlap is often all it takes to lead to account takeover, identity theft, or financial fraud.

How This Stealer Log Was Created

A stealer log like KATANA_CLOUD comes from malware that runs quietly on an infected device, collecting saved browser passwords, autofill data, and the web addresses tied to each login. The malware sends this information back to whoever controls it, and logs like this one are then commonly packaged and shared on Telegram channels, exactly where HEROIC analysts found this file on January 4, 2024.

Check If You Are Affected

If you think your email or password could be part of the KATANA_CLOUD leak or any other breach, HEROIC's free breach scanner checks your information against a database of more than 400 billion leaked records. Run a scan to see whether your credentials have been exposed.