BlackCloud Stealer Leak Leaves 117,607 Logins Exposed Online

A stealer log tied to a source calling itself "BlackCloud" surfaced on Telegram in late October 2025, and when researchers pulled it apart they found 117,607 individual records sitting inside. This wasn't a polished corporate breach announcement with a press release attached. It was a raw dump, uploaded quietly by a Telegram user, the kind of file that trades hands in private channels long before anyone outside those circles notices.

Why This Is Dangerous

Stealer logs are different from a typical hacked database because they come straight off infected computers. Malware sitting on a victim's machine quietly grabs whatever is sitting in the browser: saved passwords, autofill data, and the URLs of every site that was logged into. That means the credentials in this BlackCloud log are recent and were working at the time they were stolen, which makes them far more useful to a criminal than an old, already-cancelled password would be. Because the passwords were stored in plaintext, anyone who obtains the file can use them imediately without needing to crack or decode anything.

What Was Exposed

Here is what was found inside the 117,607 records that make up this leak:

• Email addresses tied to real user accounts
• Plaintext passwords, ready to use as-is
• URLs showing exactly which websites and services each login belonged to
• 117,607 total records bundled into one file

Why This Matters

When an email, a password, and the website it opens are all sitting in the same row, an attacker doesn't have to guess anything. They can log in directly, and if that password was reused anywhere else, they can try it on banking, email, or shopping accounts too. A lot of people don't realize how much damage a single reused password can do until it's already occured. This is also why security teams treat stealer logs seperate from older leaked databases, since the data inside tends to still be active.

How Stealer Log Works

A stealer log gets built when infostealer malware infects a device, usually through a cracked download, a fake update, or a malicious attachment. Once it's running, the malware searches the browser and any saved credential stores, copies out passwords, cookies, and autofill entries, then quietly sends everything back to whoever controls the malware. That collected data gets packaged into a log file like this one and eventually shared or sold, often on Telegram, wich is why so many of these leaks surface there before anywhere else.

Check If You Are Affected

If you think one of your accounts might be sitting inside this BlackCloud log, don't wait to find out the hard way. HEROIC runs a free breach scanner built on a database of more than 400 billion leaked records, so you can check your email address in seconds and see if it shows up in this leak or any other one that's been catalogued. It's a quick way to get ahead of a problem before someone else acts on it first.