Inside the 1.3 LOGS_CENTEER Breach: How 15,039 Records Were Compromised

On January 3rd, 2023, a stealer log file identified as LOGS_CENTEER 1.3 was uploaded to Telegram by an anonymous user, exposing 15,039 records collected from compromised endpoints in the United States. The data included email addresses, plaintext passwords, and the URLs of sites those credentials belonged to. For the people in this file, their logins were made available to anyone willing to download it, with no barrier to entry.

Why This Is Dangerous

Plaintext passwords remove every layer of protection between an attacker and a victim's account. When a database is breached but passwords are stored as hashes, there is still work to be done before those hashes become usable logins. With a stealer log, that step is skipped entirely. The malware captured passwords as they were typed or pulled them from browser storage in their original form, and those credentials went directly into the log file that ended up on Telegram.

The LOGS_CENTEER 1.3 file was distributed publicly, which means it was not sold privately to a single buyer but made available to anyone monitoring that Telegram channel. Public distribution like this accelerates the harm significantly. The same credentials can be tested against hundreds of services simultaneously by multiple threat actors acting independently.

What also makes this file notable is its scope. At 15,039 records, this is a meaningful dataset. Credential stuffing operations thrive on exactly this kind of volume, running automated login attempts accross banking, email, and retail platforms looking for any match that leads to an active account.

What Was Exposed

• Email addresses from compromised US-based endpoints
• Plaintext passwords harvested by the stealer malware
• Website and service URLs tied to each credential pair
• API host addresses revealing connected infrastructure
• Browser-stored login data captured from infected devices
• Endpoint and device identifiers from affected machines
• Account usernames paired with email addresses
• Session-related authentication data from active browsing sessions

Why This Matters

A stealer log from early 2023 might feel like old news, but credentials do not expire on their own. Unless the affected users changed their passwords after the breach, those logins are still valid and still vulnerable. Credential stuffing campaigns frequently draw from datasets that are years old, because attackers know that a large percentage of people never change their passwords until something forces them to.

The LOGS_CENTEER name appearing on multiple log versions, such as this 1.3 release, suggests an organized or recurring distribution operation. That pattern indicates the people behind this collection were actively packaging and sharing stolen credentials over time, not just acting on a single opportunity. The scale and repeat nature of these releases makes proper breach monitoring essential for anyone who was active online during that period.

How Stealer Log Works

Stealer malware gets onto a device through phishing emails that appear to come from trusted senders, fake software installers hosted on unofficial sites, malicious browser extensions, or bundled adware that installs silently. Once running, the malware conducts a quiet sweep of the system, pulling saved passwords from browsers, harvesting authentication cookies, recording credentials entered manually, and collecting any files that contain login data.

Everything gathered is formatted into a structured log file, which is why these datasets are so clean and usable. Each record ties together an endpoint ID, an email adress, a password, and a URL in a way that makes automated credential testing straightforward. The log is then sent to the attacker's infrastructure and from there uploaded to Telegram or sold through criminal channels.

The LOGS_CENTEER 1.3 release followed this exact path. The file was uploaded to a public Telegram channel where it was freely available for download, meaning the barrier between exposure and exploitation was essentially nonexistent from the moment it was posted.

Check If You Were Affected

If your email address was active in early 2023, there is a real chance your credentials appeared in the LOGS_CENTEER 1.3 file or similar breaches from that period. Find out for certain by checking your email at heroic.com, where HEROIC's breach checker cross-references your address against thousands of known breaches and tells you exactly where your data has appeared. Check now and change any passwords that may still be at risk.