How the blackk_cloud Telegram Leak Exposed 26,681 Logins

In late October 2025, HEROIC analysts traced a stealer log labeled "blackk_cloud - PRIVTE OCT 6" to a private Telegram upload. The file held 26,681 records, each pairing an email address with a plaintext password and the exact website URL it belonged to. Small compared to some mega breaches, but every record is a live, working credential pulled directly off an infected computer.

How This Data Got Out

This leak did not come from a hacked company database. It came from malware sitting quitely on someone's device, recording login activity in real time. The infection likely started with a cracked game, pirated software, or a phishing email that looked harmless. Once installed, the malware scraped saved browser credentials and shipped them to a remote server, where they were bundled into this file and uploaded to a private Telegram group under the blackk_cloud label.

Why This Is Dangerous

Because each password is stored in plaintext and matched to its own login URL, there is no cracking or guessing required. An attacker can open the file and immediately attempt to log into the exact accounts listed, whether that is a bank, an email provider, or a work portal.

What Was Exposed

• Email addresses
• Plaintext passwords
• Corresponding login URLs

Why This Matters

Small stealer logs like this one are still gold for credential stuffing attacks. Criminals feed the list into automated tools that test the same email and password combo across dozens of other sites, hoping for password reuse. A single successful match can lead to account takeover, identity theft, or direct financial fraud.

How Stealer Log Breaches Work

Stealer malware is designed to run silently in the background of an infected device. It grabs saved passwords, autofill data, and browser session details, then sends everything back to the attacker in a single log file. These logs are then sold or traded in bulk on Telegram channels and dark web forums, exactly like the one uncovered here.

Check If You Are Affected

Even a smaller leak like this one can carry serious consequences if your credentials are inside it. HEROIC's free breach scanner checks your email against a database of over 400 billion exposed records, so you can find out in secconds if you need to change your passwords.