Inside KATANACLOUD_BOT: How Stealer Malware Harvested 4,012 Passwords

HEROIC analysts identified a stealer log named "KATANACLOUD_BOT" uploaded to a Telegram channel on November 3, 2023. The file contained 4,012 records harvested from infected devices, including email addresses, plaintext passwords, and URLs tied to the services those credentials access. This kind of file gives a clear, unfiltered look at how stealer malware actually works, since it captures exactly what the malware pulled off each infected machine.

How Stealer Malware Harvested the KATANACLOUD_BOT Data

Stealer malware infects a device through a fake download, cracked software, or a malicious attachment. Once running, it quietly scans the browser and system for saved passwords, autofill data, and active login sessions, then packages everything it finds into a log file. That log, in this case, contained 4,012 email and password pairs along with the URLs tied to each one, all sent back to whoever controlled the malware before ending up on Telegram.

What Was Exposed in the KATANACLOUD_BOT Leak

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

Why This Matters for Anyone Whose Data Was Captured

Because the passwords in this file are plaintext, there is no cracking required before an attacker can use them. If any of these 4,012 credentials match an account you still use, an attacker could log in directly, and if you reuse that password elsewhere, the risk extends to every account sharing it. This is exactly the raw material that fuels credential stuffing attacks against banking sites, email providers, and workplace logins.

Why Stealer Logs Keep Turning Up on Telegram

Once a stealer log is collected, it is often uploaded to Telegram channels where it can be shared or sold with little oversight. This is why files like KATANACLOUD_BOT, at 4,012 records, keep surfacing: the malware does the collection work automatically, and Telegram provides an easy distribution channel for whatever gets harvested.

Check If You Are Affected

If your email address is among these 4,012 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 KATANACLOUD_BOT, so you can find out quickly and change any exposed passwords before they are used against you.