KATANA_CLOUD Leak Lets Hackers Log In With 4,124 Stolen Passwords

KATANA_CLOUD Stealer Log Exposes 4,124 Records

HEROIC analysts identified a stealer log dataset labeled "KATANA_CLOUD FREE" uploaded to Telegram on November 22, 2025. The dataset contains 4,124 records harvested from malware-infected devices, including email addresses, plaintext passwords, and the URLs of the accounts those credentials belong to.

What Attackers Can Do With This Data

Because the leak pairs each password with the exact web address it unlocks, an attacker does not need to guess where a credential works. They can simply load the URL, enter the email and password, and log in directly. With plaintext passwords already in hand, no cracking or decryption step is needed, meaning this dataset is ready to use for account takeover the moment someone acquires it.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the associated login pages

Why This Matters

Anyone whose credentials appear in this leak faces immediate risk of account takeover on the specific services listed, and broader risk if those same passwords were reused elsewhere. Attackers commonly automate this process, running large batches of stolen logins against banking, email, and shopping sites in what is known as credential stuffing. A single reused password can open the door to financial fraud or identity theft well beyond the original account.

How Stealer Log Malware Works

Stealer logs like this one come from infostealer malware, malicious software often delivered through a fake download, phishing link, or pirated software installer. Once it infects a device, the malware quietly collects saved browser passwords, autofill data, and login sessions, then packages everything into a single file. These files are routinely sold or shared for free on Telegram channels and dark web forums, exactly how the KATANA_CLOUD dataset came to light.

Check If You Are Affected

If you are concerned your credentials may be part of this or another leak, HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including stealer logs like this one. Run a free scan today to find out if your information has been exposed.