KATANA CLOUD PRIVATE TG ArhontCorp Leak Could Unlock 6,729 Accounts

HEROIC analysts identified a stealer log named KATANA CLOUD PRIVATE TG ArhontCorp that was uploaded to a Telegram channel on August 16, 2026. The file contains 6,729 records made up of email addresses, plaintext passwords, and the URLs those passwords unlock. The data appears to have been pulled directly from infected devices rather than stolen from one company's servers. To see if your information is part of this file, scan your email now.

This file is especially risky because the passwords inside it were never encrypted or hashed. Anyone who gets a copy can read every password in plain text the moment they open it, with no cracking or extra effort required. Combined with the URLs sitting next to each password, an attacker can see exactly which account a credential opens and log straight in.

What the KATANA CLOUD PRIVATE Log Contains

• Email Addresses: confirms who the victim is and gives attackers a target for phishing and spam.
• Plaintext Passwords: readable the instant the file is opened, so no cracking is needed before they can be used.
• URLs: show which specific site or service each password belongs to, making account takeover faster and more precise.

What Attackers Can Do With This Data

Because the passwords are already plain text and tied to specific URLs, attackers can move straight to logging into the matching accounts, no password cracking or guesswork involved. If any of these passwords were reused on email, banking, or shopping accounts, those accounts are now exposed too. Combined with a working email address, attackers also have everything they need to send convincing phishing messages or attempt to reset passwords on other services.

How a File Like This Gets Built

Stealer logs like this one come from malware that was already running on a victim's device, quietly collecting saved passwords, browser autofill data, and the web addresses tied to each login. Once the malware finishes collecting, the operator packages everything into a single file and sells or shares it, often through private Telegram channels like the one this file came from. Nothing about this requires a company to have been hacked; it only requires one infected device.

Securing Yourself After the KATANA CLOUD PRIVATE Leak

Scan your email to check whether your address appears in this file. If your device may be infected with the malware that created this log, run a full malware scan and clean the device first; changing passwords on an infected machine lets the same malware capture your new password too. Once the device is clean, change the passwords for every account tied to the leaked URLs, and use a different password for each one going forward. This applies whether the exposed login was for a personal email account or one you use for work.