The Niflheim 3.9GB RATLOG Dumped 6.4 Million Passwords Online

HEROIC analysts identified a stealer log named "3.9 GB RATLOG" circulating on a well-known hacking forum around May 24, 2024, posted by a user going by "ComboPoster" and advertised under the name "Niflheim." The listing claimed around 50 million lines of data, but once duplicates were removed, the file contained 6,440,705 unique records. Each record paired an email address with a plaintext password and the homepage URL that login was tied to.

Why the Niflheim RATLOG Is Dangerous

These passwords were not sitting behind encryption in a hacked database. They were captured in plaintext, straight from infected devices, which means anyone who buys or downloads this log can use the credentials immediately without any cracking involved. The homepage URL attached to each entry tells an attacker exactly which website or service the login unlocks, turning a raw data dump into a targeted list of accounts ready to be broken into.

What Was Exposed in the Niflheim RATLOG

• Email addresses
• Plaintext passwords
• Homepage URLs tied to each login

Why This Matters for Anyone Reusing Passwords

With 6.4 million working login pairs in one file, attackers can automate attempts against banking sites, email providers, and shopping accounts, a technique known as credential stuffing. Since so many people reuse the same password on multiple sites, one exposed login can quickly cascade into several compromised accounts, opening the door to account takeover, identity theft, and financial fraud.

How a RAT Log Like This One Gets Built

This type of log traces back to a Remote Access Trojan or infostealer malware quietly installed on a victim's computer, often hidden inside a cracked program, pirated software, or a malicious attachment. Once running, the malware pulls saved browser passwords, autofill entries, and stored login sessions off the infected device, bundles them into a file, and sends that file back to the attacker. That file is what eventually gets packaged and sold on hacking forums, as happened here with the 500 dollar asking price advertised for this log.

Check If You Are Affected

If you have reused a password across more than one account, it is worth finding out whether your information is part of this leak. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including logs like this one, so you can check your exposure in about a minute.