How a Stealer Log Named KATANA_CLOUD Led to 2,872 Stolen Logins

HEROIC analysts identified a stealer log file named KATANA_CLOUD that was uploaded to a Telegram channel on December 30, 2023. The file contains 2,872 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 2,872 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, turning a simple download into immediate, working access.

What Was Exposed in the KATANA_CLOUD Log

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

Why This Matters

With 2,872 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 the KATANA_CLOUD Logins Were Stolen

A stealer log like KATANA_CLOUD starts with malware quietly installed on a victim's device, often through a malicious download or a fake software crack. Once running, it scans the browser for saved passwords, autofill entries, and the web addresses tied to each login, then bundles everything into a single file. That file is sent back to whoever controls the malware and, from there, is commonly packaged and shared on Telegram channels, exactly where HEROIC analysts found this one on December 30, 2023.

Check If You Are Affected

If you think your email or password could be part of the KATANA_CLOUD stealer log 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.