The CASPER CLOUD FREE Leak Hit Telegram in September. 36K Passwords Are Already Out There.

HEROIC analysts identified a stealer log file uploaded to a public Telegram channel on September 8, 2025, under the name "CASPER CLOUD FREE." The dataset contains 36,584 records harvested from compromised endpoints, exposing email addresses, plaintext passwords, and URLs tied to API hosts and login portals. What makes this leak particularly alarming is that the passwords were never hashed or encrypted -- they were pulled directly from infected machines and dumped in readable form, ready for immediate misuse.

Why This Stealer Log Is More Dangerous Than a Typical Breach

Unlike a database breach where attackers still need to crack password hashes, this log hands them working credentials on a silver platter. With plaintext passwords and matching email addresses, anyone who downloaded this file can attempt to log in to email accounts, banking platforms, streaming services, and workplace systems right away. The included URLs reveal exactly which services the victims were using, so attackers do not even need to guess where to try the stolen credentials. Credential stuffing tools can automate thousands of login attempts per minute, meaning a single person could test all 36,584 records across dozens of platforms in a matter of hours. Because the data was posted to a public Telegram channel, it was accesible to anyone with the link -- not just sophisticated hackers, but also low-skill criminals who buy or share these logs freely.

What Was Exposed in the CASPER CLOUD FREE Leak

• Email Addresses
• Plaintext Passwords
• URLs (API hosts, login portals, and web services accessed from compromised devices)

Why This Matters for Account Security

When plaintext passwords enter the criminal ecosystem, the damage spreads far beyond the original infection. Most people reuse passwords across multiple accounts, so a single stolen credential can unlock email, social media, banking, and workplace tools all at once. Attackers often start with email accounts because resetting passwords for every other service runs through email -- meaning one compromised inbox gives them control over an entire digital identity. From there, identity theft, fraudulent purchases, and even corporate network intrusions become much easier to pull off. Victims frequently do not realise anything is wrong until weeks or months later, when the financial or reputational damage has already occured. The timeline here is also notable: this data surfaced in September 2025 and is only now recieving broader attention, giving attackers a significant head start.

How Stealer Log Attacks Work

A stealer log is the output of infostealer malware -- a type of program that secretly installs itself on a victim's device, usually through a phishing email, a malicious download, or a compromised software installer. Once active, the malware scans the device for saved passwords in browsers like Chrome and Firefox, session cookies, autofill data, and any credentials stored in apps. It packages all of this into a log file and sends it back to the attacker's server. The attacker then reviews, sorts, and often resells these logs on dark web marketplaces or shares them on Telegram channels like the one used for this leak. The name "CASPER CLOUD FREE" suggests this was distributed through a free-tier channel designed to attract buyers or demonstrate the quality of the stolen data to potential customers. Victims typically have no idea their device was ever infected.

Check If Your Email Was Exposed

If you beleive your email address or passwords may have been caught in this leak or any similar stealer log, you can check for free using HEROIC's breach scanner at heroic.com. HEROIC monitors a database of over 400 billion compromised records, including stealer logs, dark web dumps, and breach compilations from across the internet. A quick search can tell you whether your credentials have appeared in known leaks so you can take action before an attacker does. Changing your passwords and enabling two-factor authentication on important accounts are the most effective steps you can take right now.