Researchers Link the lionking_cloud Dump to 35,949 Stolen Credentials

In July 2025, security researchers identified a large stealer log upload on Telegram linked to the lionking_cloud operation, containing 35,949 records harvested from compromised devices worldwide. The dataset, labeled with a 551-count file structure, included plaintext passwords, email addresses, and URLs documenting the exact services each victim was accessing when malware silently captured their login credentials. The scale of this collection, tens of thousands of verified working credentials, points to a well-resourced criminal operation running automated harvesting infrastracture across a broad network of infected endpoints. HEROIC has confirmed this data remains in active criminal circulation.

Why This Is Dangerous

A dataset of 35,949 plaintext credentials is large enough to fuel sustained fraud campaigns across multiple sectors simultaneously. Attackers using automated credential stuffing tools can test every email-password pair in this collection against banking, e-commerce, and corporate login portals within hours. The URL data gives them a precise hit list, allowing them to skip irrelevant accounts and focus directly on the financial and professional services each victim was using. This makes the lionking_cloud dataset significantly more dangerous than a generic password dump with no contextual informaton attached.

What Was Exposed

• Email Addresses: Login identifiers for virtually every online account, enabling targeted phishing, account recovery exploitation, and credential stuffing attacks at scale.
• Plaintext Passwords: Unencrypted credentials captured directly from victim devices, ready for immediate use in automated login attempts without any additional processing.
• URLs: A detailed record of the services each victim was actively authenticated to at the time of infection, giving attackers a ranked list of high-value accounts to target first.

Why This Matters

With 35,949 records, the lionking_cloud dump is one of the larger stealer log collections identified from this period. Researchers tracking this dataset note that it has been shared across multiple criminal communities since its initial Telegram upload, meaning the number of criminal actors who have accessed this data continues to grow over time. Victims who have not changed their passwords since July 2025 remain vulnerable today, as the compromised credentials retain their value for every platform where they continue to work.

How Stealer Log Works

Stealer log operations like lionking_cloud rely on malware installed on victim devices through phishing emails, cracked software, or malicious browser extensions. Once deployed, the malware operaters in the background, continuously harvesting credentials from the browser's password manager, recording keystrokes entered on login pages, and stealing session cookies that allow attackers to access accounts without ever needing to log in with a password. The stolen data is assembled into structured log files and delivered to the criminal operator, who then packages and distributes it through Telegram channels or private dark web forums.

Check If You Are Affected

HEROIC's free dark web scanner searches more than 400 billion exposed records, including stealer log collections like this lionking_cloud dataset. Visit heroic.com to run your free scan and find out immediately whether your email address or passwords appear in this breach or any other known dataset. With 35,949 records already in criminal hands, checking now and changing any compromised passwords is the most important step you can take to protect your accounts.