The RedLine 333 0day Breach Could Unlock Your Bank, Email, and Work Accounts

In April 2023, HEROIC analysts identified a verified stealer log dataset posted to Telegram by an anonymous user. The file, known as 20230424_redline_333_0day uploaded by a Telegram User, contained 6,157 records stolen from infected computers using the RedLine information stealer. Each record included an email address, a plaintext password, and the URL of the site where that password was used. The name in the file references RedLine, one of the most widely used and aggressively distributed malware tools in the cybercriminal world. A single record in this file is often enough to begin a chain of account takeovers that can reach banking, email, and work systems in a single afternoon.

Why This Is Dangerous

RedLine is not an ordinary piece of malware. It is a commercially sold tool that any criminal can purchase for as little as a few hundred dollars and deploy at scale. Because it is so accessible, RedLine accounts for a significant portion of all stolen credential logs circulating on the dark web and Telegram at any given time.

The passwords in this file were not cracked or guessed. They were captured in the moment you typed or autofilled them, before any protection could intervene. That makes them as fresh and accurate as the day they were stolen. An attacker who downloads this file does not need any additional tools or skills to start attempting logins right away.

What Was Exposed

• Email Addresses: Account identifiers that allow attackers to pinpoint exactly who they are targeting
• Plaintext Passwords: Unencrypted credentials captured live from infected devices, ready to use immediately
• URLs: The specific websites associated with each credential, eliminating any guesswork for the attacker

Why This Matters

The chained risk from a single leaked credential is what makes RedLine logs especially destructive. Email accounts are typically the first target, because a compromised inbox gives attackers access to password reset links for banking, investment, and e-commerce accounts. Once inside an email account, they can intercept notifications, trigger resets, and lock the real account holder out within minutes.

From the inbox, the chain extends to financial platforms, workplace tools, and social media. Credential stuffing tools can test these logins against hundreds of popular platforms within hours. Unauthorised purchases, loan fraud, and in some cases a complete takeover of a person's digital identity are common outcomes. Recovering from this kind of damage is a long, frustrating process that many victims say takes months or even years to fully resolve. Every record in the 333 0day file represents a seperate starting point for exactly this kind of cascading attack.

How RedLine Stealer Works

RedLine is sold as a subscription service on Russian-language cybercrime forums. A buyer purchases access, customises the payload, and distributes it through phishing emails, fake software downloads, or compromised websites. When a victim runs the infected file, RedLine immediately begins scanning the device for saved browser credentials, cookies, autofill data, and cryptocurrency wallet files.

The malware transmits everything to a command-and-control server and then often deletes itself, leaving little trace. The collected data is compiled into a structured log file, which is either kept private, sold, or distributed freely on platforms like Telegram. The "0day" label in the filename indicates the logs were fresh at time of upload, meaning the infections were recent and the credentials likely still active. The number "333" in the filename may refrence a batch or job identifier used by the operator. Victims almost never know their information was taken untill a breach notification or account lockout makes it obvious.

Check If You Are Affected

HEROIC's breach scanner indexes more than 400 billion compromised records, including RedLine stealer logs and other malware-derived datasets. If your email address appears in the 20230424_redline_333_0day file or any of thousands of other breaches, you will receive an instant notification with details on what was exposed.

The scan is free, takes under a minute, and could be the difference between catching a threat early and dealing with the full chain of damage. Check your email at heroic.com today.