Security Researchers Flag Denmark 13 Leak of 34,737 Login Records

Security Researchers Flag a Stealer Log Named "Denmark 13"

On February 18, 2023, security researchers at HEROIC observed a file named "Denmark 13" being posted to a Telegram channel known for distributing stolen credentials. The file contained 34,737 records, with each entry pairing an email address, a plaintext password, and the URL of the site where that login was captured. As with other stealer logs, the "13" in the file's name likely marks it as one entry in a numbered series the uploader has been releasing over time.

Why This Is Dangerous

Analysts note that because every password in the file is unencrypted, an attacker does not need any special tools to put the data to use. Each record already lines up an email address with its matching password and the exact site it unlocks, which means an attacker can start testing logins the moment the file is downloaded. With nearly 35,000 entries, the file offers enough volume for automated tools to work through methodically rather than one login at a time.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs and endpoints tied to each login

Why This Matters

Researchers point out that password reuse is what turns a single stolen credential into a much bigger problem. If someone's email and password combination shows up here, the same pairing is often valid on banking, shopping, or social media accounts as well. That opens the door to credential stuffing, account takeover, and, if the linked email is compromised, the ability for an attacker to reset passwords on other accounts entirely.

How Stealer Logs Work

Investigators explain that stealer malware is usually delivered through pirated software, cracked games, or malicious attachments, and once it lands on a device, it quietly extracts saved passwords and autofill data straight from the browser. That harvested data is packaged into a log file and sent back to the attacker, commonly through an automated Telegram bot. Logs like "Denmark 13" are frequently posted for free to build credibility, while more curated or higher value logs are usually sold privately.

Check If You Are Affected

Anyone concerned their credentials might be sitting in a file like this one can check directly. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including stealer logs such as this, making it quick to confirm exposure and update any at-risk passwords.