MARVEL_PRIME 3.12 Uploaded by a Telegram User: 9,518 Passwords Leaked

A Stealer Log Named MARVEL_PRIME 3.12 Surfaced on Telegram

On December 16, 2022, HEROIC analysts identified a stealer log labeled "MARVEL_PRIME 3.12" posted openly to a public Telegram channel. The file contained 9,518 records harvested directly from infected endpoints, including email addresses, plaintext passwords, and the URLs of the sites those credentials unlocked. Unlike a hacked database, this data came straight from malware running on victims' own devices, capturing whatever they typed into their browsers.

Why This Is Dangerous

Because the passwords in this log are stored in plaintext, alongside the exact web addresses they belong to, anyone who obtains this file has a ready made list of working logins. There is no need to crack or guess anything. An attacker can simply match an email address to its password and the site it opens, then log in as if they were the account owner. That kind of direct access is what makes stealer logs especially valuable to criminals compared to breached databases that only contain hashed passwords.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the associated login pages

Why This Matters

Because these credentials were captured in plaintext and paired with the exact site each one unlocks, they are immediately usable for account takeover. If any of the 9,518 exposed logins are reused across other accounts, banking, email, social media, the same credentials can unlock those too. This is exactly how credential stuffing attacks succeed: attackers automate login attempts across hundreds of websites using leaked email and password pairs until one works.

How Stealer Logs Work

A stealer log is the output of information stealing malware, malicious software quietly installed on a victim's computer that scans browsers, apps, and saved files for anything resembling login credentials. Once installed, the malware silently collects usernames, passwords, cookies, and autofill data, then transmits it back to whoever controls the infection. That data is often packaged into a single file, like this one labeled "MARVEL_PRIME 3.12", and sold, traded, or in this case, given away for free on channels like Telegram. Because the malware captures data at the moment a person types it in, even accounts protected by strong, unique passwords can be caught if the device itself is compromised.

Check If You Are Affected

If you think your email address may be part of this or any other stealer log, HEROIC's free breach scanner checks your information against a database of more than 400 billion leaked records, including stealer logs like MARVEL_PRIME 3.12. Run a free scan to see if your credentials have been exposed, and if they have, change the affected passwords immediately and avoid reusing them anywhere else.