The 433 PCS Free Logs Breach Happened in 2023. The Data Just Went Public.

HEROIC analysts identified a stealer log dataset uploaded to Telegram in September 2023 that exposed 6,370 records from compromised endpoints. The file, shared by an anonymous Telegram user under the label "433 PCS - FREE LOGS," contained email addresses, plaintext passwords, and URLs harvested directly from infected machines. Stealer logs of this kind are typically assembled from malware-infected devices and then distributed freely in cybercriminal channels as a way to build reputation or recruit buyers for larger datasets.

Why Plaintext Passwords in a Stealer Log Are Especially Dangerous

Unlike breached databases where passwords are stored as hashes, stealer logs capture credentials at the moment a user types them. That means the passwords in this dataset are exactly what victims used on their accounts, with no decryption step required. Attackers can take these credentials and immediately begin testing them against email providers, banking portals, and social media platforms. Because many people reuse the same password across multiple accounts, a single stolen credential can open doors far beyond the original infected device.

What Was Exposed in the 433 PCS Free Logs Leak

• Email Addresses
• Plaintext Passwords
• URLs (the specific sites or endpoints where credentials were captured)

Why This Matters Beyond the 6,370 Records

A dataset of 6,370 records might seem small compared to multi-million-record megabreaches, but stealer log files are operationally more dangerous per record than most other breach types. Each entry links a specific person to a specific site with a working, unencrypted password. That combination is everything an attacker needs for account takeover, credential stuffing campaigns, or targeted phishing that uses real account details to appear legitimate. Victims may also be exposed to identity theft if their email accounts are compromised and used to reset passwords elsewhere, and financial fraud if any of the captured URLs point to banking or payment platforms.

How Stealer Log Malware Works

Stealer logs are produced by a category of malware known as information stealers. Once a device is infected, typically through a malicious download, a phishing email attachment, or a compromised software installer, the malware runs silently in the background and records keystrokes, extracts saved browser credentials, and captures session cookies. It then packages all of this into a structured log file and transmits it to the attacker's server. The attacker either uses those credentials directly, sells them on dark web marketplaces, or as in this case, shares them freely on platforms like Telegram to gain credibility or attract followers. The 433 PCS label refers to the number of log packages in the set, and "FREE LOGS" indicates these were distributed at no cost, making them immediately available to anyone in those channels.

Check If Your Credentials Were Exposed

If you were active on any site during 2023 and your device may have been compromised at any point, your credentials could appear in datasets like this one. HEROIC's free breach scanner searches across more than 400 billion records, including stealer log collections, to tell you whether your email address has been found in known breached datasets. Run a free search now to find out if your information is circulating in the same channels where this file was shared.