Search Your Email: The MARVEL_PRIME Dump Exposed 9,996 Stolen Accounts on Telegram

HEROIC analysts catalogued the MARVEL_PRIME stealer log breach in September 2023, when a Telegram user uploaded a file containing 9,996 records harvested from devices infected with infostealer malware. The exposed data included email addresses, plaintext passwords, and URLs collected directly from victims' browsers and applications without their knowledge or consent.

Why This Is Dangerous

The MARVEL_PRIME log represents a direct and immediate threat to anyone whose credentials appear in it. Because the passwords are stored in plaintext, attackers have no technical barriers to using them right away. Nearly 10,000 individuals could find their email and social media accounts, banking portals, and workplace systems accessible to strangers within hours of this data circulating on Telegram. The URLs in the dataset serve as a precise guide to the most valuable accounts each victim holds, allowing criminals to prioritize their attacks for maximum impact.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs (website and application endpoints)

Why This Matters

Stealer log data fuels some of the most effective forms of cybercrime. Credential stuffing attacks powered by datasets like MARVEL_PRIME can automate the process of testing stolen logins across hundreds of websites simultaneously. When a match is found, the consequences range from account takeover and identity theft to full financial fraud. Victims who use the same password on multiple sites face a compounding risk: once attackers find one working login, they can chain that access across every account that shares the same credentials. Changing passwords after learning about a breach is the single most effective thing affected individuals can do, but most people never recieve a warning that their data was exposed in the first place.

How Stealer Logs Work

Stealer log malware is a category of software engineered specifically to extract credentials silently from an infected device. Infection typically occurs through deceptive means: a phishing email with a malicious attachment, a pirated software download, or a fake browser extension. Once the malware is installed, it immediately begins scanning the system for stored passwords in browsers like Chrome, Edge, and Firefox, harvesting session tokens and cookies, and collecting saved application credentials. The resulting log file is transmitted to the attacker automatically. These logs are then packaged and distributed on Telegram, often under names like MARVEL_PRIME, where they are shared or sold to other bad actors. The entire process from infection to distribution can occurr within hours, long before the victim has any reason to suspect something is wrong.

Check If You Are Affected

Search your email address now to find out if your data appeared in the MARVEL_PRIME stealer log or any of the other breaches in HEROIC's database of over 400 billion exposed records. The check is completely free and takes only seconds. Visit heroic.com to run a free scan and get a full picture of your personal exposure across known data breaches.