Our Analysts Found 5,361 Leaked Passwords in the KATANA_CLOUD Dump

HEROIC analysts found a stealer log labeled "KATANA_CLOUD FREE" circulating on a Telegram channel, uploaded on November 15, 2023. The file contained 5,361 records pulled directly from infected devices, including email addresses, plaintext passwords, and URLs tied to the services those credentials access. Because the data comes straight from malware running on victims' own machines, it represents working logins at the time they were collected, not scrambled or partial data from a company database.

Why the KATANA_CLOUD Dump Is Dangerous

Plaintext passwords remove the one obstacle that normally slows attackers down: cracking a hash. Anyone who finds this file on Telegram can try these 5,361 email and password combinations directly against the services they were tied to. Because so many people reuse the same password across multiple accounts, a single pair pulled from this log can open doors far beyond its original source.

What Was Exposed in the KATANA_CLOUD Leak

• Email addresses
• Plaintext passwords
• URLs tied to the services and API endpoints each credential accessed

Why This Matters Even at 5,361 Records

A leak this size can still cause real harm. Stealer log data like this feeds directly into credential stuffing attacks, where automated tools test stolen email and password pairs against banking sites, email providers, and workplace logins. If any of these 5,361 credentials match an account you still use, an attacker could take it over, change its recovery details, and use it as a stepping stone toward identity theft or financial fraud.

How Stealer Log Malware Builds Files Like This

Stealer malware infects a device through a fake download, cracked software, or a malicious attachment, then quietly collects saved browser passwords, autofill data, and session details before sending everything back to the attacker. It does not target one company or platform. It grabs whatever credentials are stored on the infected machine, which is why a single file like KATANA_CLOUD can mix email accounts with unrelated service URLs.

Check If You Are Affected

If your email address is among these 5,361 records, an attacker may already have a working password for one of your accounts. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like KATANA_CLOUD, so you can find out quickly and change any exposed passwords before they are used against you.