Your Passwords May Be Exposed. The MARVEL_PRIME Log Held 23,237 Records.

HEROIC analysts identified a stealer log shared on Telegram under the label "MARVEL_PRIME." The file was uploaded on January 3, 2023, and contains 23,237 records, each including an email address, a plaintext password, and the URL of the site the credentials were used on.

Why the MARVEL_PRIME Stealer Log Is Dangerous

This is not a breach of one company's database. It is a stealer log, a file built from credentials that malware quietly copied off infected computers. Because the passwords in this log are stored in plaintext, anyone who gets a copy of the file can use the logins immediately, with no extra work needed to crack or decode anything. With more than 23,000 records in a single file, this is a sizable collection of ready-to-use credentials.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the accounts each password unlocks

Why This Matters

Attackers who obtain this log can run the exposed email and password pairs against other popular websites, a tactic known as credential stuffing. Anyone in this log who reused a password across multiple accounts is at risk of account takeover on email, banking, social media, or shopping sites. From there, the path to financial fraud and identity theft is short: an attacker who gets into an email account can often reset passwords on every other account tied to it.

How Stealer Logs Like MARVEL_PRIME Are Created

Stealer logs are produced by a category of malware known as infostealers. Victims are usually infected through a fake software download, a cracked game or app, or a malicious attachment. Once running, the malware pulls saved passwords and autofill data straight out of the browser and bundles them, along with the sites they belong to, into a single file. That file is then named, packaged, and passed around on Telegram channels and dark web forums, where buyers use it to attempt logins across as many sites as possible.

Check If You Are Affected

If your email address is one of the 23,237 records in the MARVEL_PRIME log, or in any other breach, you can find out for free with HEROIC's breach scanner. It checks your email against a database of more than 400 billion leaked records and shows you exactly what has been exposed, so you can change any reused passwords before someone else does.