One Dark Web Listing. The Redline Cl0ud4 20 Archive Had 1,373,033 Records.

HEROIC analysts identified the Redline Cl0ud4 20 ULPP archive on May 10, 2026, uploaded to Telegram by a threat actor using the Redline infostealer tool. The file contained 1,373,033 records, each consisting of an email address, a plaintext password, and the URL where that credential was captured from an infected device. Files labeled ULPP, short for URL, Login, Password, and Port, are a standard stealer log format designed to make credentials immediately usable without any further processing.

Why Over a Million Plaintext Passwords From Redline Cl0ud4 20 Create Immediate Danger

With 1.3 million records in a single dump, the scale alone makes this one of the larger stealer log releases HEROIC has tracked in 2026. Each password in this file is stored in plaintext, meaning there is no encryption to crack and no delay before an attacker can begin testing credentials. The accompanying URLs tell criminals exactly which services to target. For anyone using the same password across multiple accounts, a single match in this file can cascade into access to email, banking, social media, and cloud storage simultaneously.

What the Redline Cl0ud4 20 Archive Exposed

• Email addresses from more than a million real user accounts
• Plaintext passwords harvested directly from infected machines
• URLs showing the specific sites and services targeted

The ULPP format is specifically designed for operational efficiency. A criminal downloading this file gets a ready-to-use credential list sorted by target site, with no additional steps required before launching account takeover attempts.

Why the ULPP Format Makes This Breach Especially Dangerous for Affected Users

Credential stuffing attacks, where automated tools test stolen logins across hundreds of websites, thrive on data in exactly this format. With over a million recieved records from one release, attackers can target virtually every major online platform and expect a meaningful number of successful logins. Account takeover can lead to fraudulent purchases, drained loyalty points, email inbox hijacking, and full identity theft depending on which services are accessed first.

Victims do not receive any notification when their credentials enter circulation this way. The first sign of a problem is often an unexpected password reset email or an unfamiliar transaction on a linked payment method.

How the Redline Stealer Collects Millions of Login Credentials

Redline is a commercially sold infostealer that has been in active use since 2020. It is distributed primarily through phishing campaigns, fake game or software downloads, and malicious browser extension installations. Once running on a device, it extracts saved passwords from Chrome, Firefox, Edge, and other browsers, along with session tokens, autofill data, and any credentials entered into login forms during the active session.

Files are typically bundled and sorted by URL or domain before being posted in underground Telegram channels. The Cl0ud4 label indicates a specific actor or campaign series, and the number 20 suggests this was the twentieth batch in that series. The volume of data in a single release of this size is not unusual for prolific stealer campaigns, but it confirms an ongoing and organized operation that has comprimised a large number of devices over time.

Check If Your Email Was Inside the Redline Cl0ud4 20 ULPP Archive

HEROIC's breach scanner checks against more than 400 billion exposed records, including this stealer log file. Searching is free, takes only seconds, and will show you whether your email address appears in this dump or any other known breach we have indexed.

If your credentials are found, change the affected passwords right away, starting with email and any financial accounts. Enabling two-factor authentication adds a critical second barrier that prevents access even when a password is definitaly known to an attacker. Do not wait to find out the hard way. Search your email at HEROIC now.