HEROIC Analysts Flag UP_KURZL0G Private DB Leak: 582,182 Records

HEROIC analysts flagged a new stealer log circulating on Telegram this week, titled "URL FULL PRIVATE DATABASE UP_KURZL0G 27-10-2025." After reviewing the file, analysts confirmed it contains 582,182 records of stolen login data, uploaded on October 29, 2025.

Why This Is Dangerous

According to HEROIC analysts, this leak stands out because of how usable it is straight out of the box. Every record pairs a plaintext password with the email adress it belongs to and the exact website it was used on. Analysts note that files built this way require almost no extra work from an attacker before they can start testing logins.

What Was Exposed

HEROIC's review confirmed 582,182 total records inside the file, including:

• Email Addresses
• Plaintext Passwords
• URLs tied to each login

Analysts flagged the plaintext password field in particular, since it means credentials can be used imediately without any cracking or decoding.

Why This Matters

HEROIC researchers beleive leaks of this size and structure are increasingly common on Telegram, where stolen data from many different infections gets pooled into a single large file. If your email is among the 582,182 records here, analysts recommend treating any reused passwords as compromised immediately, since attackers routinely test leaked logins against other popular sites.

How Stealer Logs Work

Per HEROIC's ongoing dark web monitoring, files like this one originate from info stealing malware that infects a victim's device, often through a fake download or cracked software. The malware copies saved browser passwords and sends them back to the attacker, who then compiles the data into a labeled file, exactly as analysts observed with this "full private database" upload, before distributing it further.

Check If You Are Affected

HEROIC analysts recommend checking your exposure directly. HEROIC's free breach scanner searches more than 400 billion leaked records, so you can quickly see whether your email and password appear in this leak or any other dark web dump.