How a Telegram User Leaked the MARVEL_CLOUD marvelcloudRB Stealer Log

HEROIC analysts discovered a stealer log file on February 14, 2023, after it was uploaded to a Telegram channel by an anonymous user. The file, labeled MARVEL_CLOUD marvelcloudRB, contained 4,173 recieved records from compromised endpoints, including email addresses, plaintext passwords, and API host URLs. The data appears to have been harvested by malware running silently on infected devices, capturing login credentials before sending them off to an attacker-controlled server.

What Attackers Can Do With Stolen Plaintext Passwords and API URLs

When passwords are stored in plaintext and leak alongside API host URLs, attackers gain direct, ready-to-use access. They can log into accounts without any cracking, attempt the same credentials on banking, email, and social media platforms, and use the API URLs to probe internal systems or cloud services. This combination is partcularly dangerous because it hands attackers both the key and the address of the door it opens.

What Was Exposed in the MARVEL_CLOUD marvelcloudRB uploaded by a Telegram User Breach

• Email Addresses
• Plaintext Passwords
• URLs

Why Stealer Log Leaks on Telegram Put Real People at Risk

Stealer logs shared on Telegram are accessable to thousands of threat actors within minutes of being posted. Once credentials from a leak like this circulate, they are loaded into automated tools used for credential stuffing, account takeover, and identity theft. Victims often have no idea their passwords were stolen until they notice unauthorized activity in their accounts, by which point financial fraud or personal data misuse may have already occured.

How Stealer Log Breaches Work

A stealer log breach begins with malware, often spread through phishing emails, fake software downloads, or malicious ads. Once installed on a device, the malware quietly records passwords, email addresses, and browser session data as the user goes about their day. That data is packaged into a log file and sent to the attacker. These logs are then sold, traded, or posted publicly on platforms like Telegram, putting victims at risk long after the malware was removed.

Check If Your Data Was Exposed

HEROIC's free breach scanner searches across more than 400 billion records to tell you whether your email or passwords appeared in this leak or thousands of others. Run a free scan at HEROIC to find out what attackers may already know about your credentials, and take action before your accounts are compromised.