One Upload. 1,034,077 Records. The BlackHat_Cloud Leak Went Public.

HEROIC analysts tracked a stealer log dump called "BlackHat_Cloud 350" that appeared on a Telegram channel on June 20, 2025. Despite its modest sounding name, this single upload contained 1,034,077 records, each one pairing an email address with a plaintext password and the URL where the login was captured. Crossing the one million mark puts this leak in a different league than the smaller Telegram dumps HEROIC tracks on a daily basis.

Why the BlackHat_Cloud Leak Is a Bigger Threat Than It Sounds

A million plaintext credentials in one file is enough to fuel large scale automated attacks for weeks. Bots can cycle thru the entire list against major websites in the background, testing logins around the clock without a human ever touching a keyboard. Because none of the passwords are hashed, there is no delay for cracking, every single record is instantly usable the moment the file is downloaded.

What Was Exposed in BlackHat_Cloud 350

• 1,034,077 email addresses
• Plaintext passwords for each account
• URLs showing exactly which site or service each login belongs to

Why This Matters to You

With over a million records in play, the odds that your email address is somewhere inside this leak are far from negligible. If your password is reused anywhere else, attackers running credential stuffing campaigns against this exact list could gain access to your banking, email, or shopping accounts before you even know somthing is wrong. Once that first account falls, identity theft and financial fraud tend to follow quickly.

How a Million Record Stealer Log Gets Assembled

Dumps this large are rarely the product of a single infection. Instead, criminals combine output from thousands of malware infected devices, filter out duplicates, and package the results into one organized file like this one, then label it with a name and number, in this case "350," to track different versions or batches. The finished product is then shared on Telegram, where it can spread to a wide audience of buyers and other criminal groups within hours.

Check If You Are Affected

When a leak crosses one million records, checking your exposure isn't optional, it's essential. HEROIC's free breach scanner searches more than 400 billion leaked records, including large dumps like BlackHat_Cloud 350, so you can find out immediately whether your information is exposed and take action to lock down your accounts.