The MarvelCloudRB Leak: 459 Passwords Exposed. Yours Might Be One.

The MarvelCloudRB Leak: 459 Records From a Stealer Log

HEROIC analysts found a small stealer log uploaded to a Telegram channel on December 30, 2022, tagged "marvelcloudRB." The file held 459 records tied mainly to United States users, including email addresses, plaintext passwords, and URLs. The name "marvelcloudRB" looks like an uploader's own label for the file rather than a confirmed cloud provider or company that suffered a breach, and nothing in the data itself confirms which service, if any, it targets.

Why This Is Dangerous

Small does not mean harmless. Each of the 459 records pairs an email address with a plaintext password and the URL of the account it unlocks. That is everything an attacker needs to attempt a direct login, no password cracking or additional research required.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs linked to the accounts

Why This Matters

A log of this size is easy to overlook, but the people in it face the same risks as those caught up in far larger breaches. If any of the 459 affected users reused their password elsewhere, an attacker can use credential stuffing to try that same combination on other sites, potentially leading to account takeover, identity theft, or financial fraud.

How Stealer Logs Work

Stealer logs are produced by information-stealing malware that infects a device, often through a pirated download, a cracked application, or a malicious link. Once installed, it collects saved passwords and autofill data from the browser and writes them to a file together with the URL each credential belongs to. These files are then shared or sold on Telegram channels that specialize in trading stolen data. This particular log was dated December 30, 2022, and carried the "marvelcloudRB" tag applied by whoever uploaded it.

Check If You Are Affected

HEROIC's database includes more than 400 billion breached and leaked records, from massive corporate breaches down to small stealer logs like this one. Use HEROIC's free breach scanner to check whether your email address appears in this leak or any other, so you know where you stand.