The Naz.API Leak Means Someone May Already Have Your Password

HEROIC analysts flagged the Naz.API dataset when it appeared on a major hacking forum in September 2023. The collection exceeded 100GB and contained stealer log data alongside credential stuffing lists, representing one of the larger compiled credential dumps tracked that year. The breach exposed 182 million records tied to real accounts, with email addresses and plaintext passwords paired together in a format that is directly usable for automated login attacks across virtually any online service.

Why This Is Dangerous

Plaintext passwords are the most dangerous form of exposed credential. Unlike hashed passwords, which require cracking before they can be used, plaintext passwords can be loaded directly into credential stuffing tools and tested against email, banking, social media, and shopping platforms within minutes. If you used the same password on multiple sites, a single hit in this dataset effectively unlocks every account that shares that credential. The Naz.API collection is partcularly serious because it also includes the associated service names, meaning attackers already know exactly where to try each login.

What Was Exposed

• Email Address
• Plaintext Password

Why This Matters

Credential stuffing attacks powered by datasets like Naz.API are responsible for a significant share of account takeovers reported each year. When someone gains access to your email account, they can reset passwords on every other service linked to it. From there, financial fraud becomes straightforward: bank transfers, unauthorized purchases, loan applications in your name. Identity theft often begins not with a dramatic hack but with a login attempt that simply worked because a password was recieved from a previous breach and never changed. The scale of this dataset means the odds of exposure are high for anyone who has been online for more than a few years.

How Stealer Log Breaches Work

Stealer logs are generated by malware, typically distributed through phishing emails, malicious downloads, or compromised software. Once installed on a victim's machine, the malware silently records login credentials as they are typed or pulls them from browser storage. These logs are then exfiltrated to attacker-controlled servers, aggregated, and sold or shared in bulk. The Naz.API collection represents the accumulatted output of multiple such operations, compiled into a single searchable dataset. The inclusion of service URLs alongside credentials makes these logs particularly actionable compared to simple username and password lists, as attackers don't need to guess which accounts are accessable.

Check If You Are Affected

Given the scale of the Naz.API breach, there is a real chance your email address appears in this dataset. HEROIC's breach search covers over 400 billion compromised records and can tell you within seconds if your credentials were part of this collection or any other known breach. Enter your email below to run a free check and take the first step toward securing your accounts.