butterfly_logs 541count Leak Exposed 19,438 US Accounts

In June 2025, HEROIC analysts identified a stealer log dataset posted to Telegram under the label butterfly_logs 541count, exposing 19,438 records pulled directly from malware-infected devices in the United States. Each record contains an email address, a plaintext password, and the exact URL of the login page where credentials were harvested. The file was shared through private Telegram channels used by threat actors to trade stolen access credentials. This dataset represents a serious and immediate risk to every individual whose data appears inside it.

Why This Is Dangerous

With nearly 20,000 working email-password-URL combinations in a single file, attackers gain ready-made firepower for credential stuffing campaigns. They do not need technical skill beyond running an automated tool. The login URLs tell them exactly where to point those tools, whether that means a banking portal, a corporate VPN, a cloud service, or an email provider. Victims remain completely unaware while their accounts are tested within hours of the log being shared. Because this data is fresh from 2025, many of these credentials are still active and the accounts they belong to are likely still in use today. Attackers who recieve stealer log packages like this one typically run their tools before victims ever find out they were compromised.

What Was Exposed

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

Why This Matters

Stealer log data from 2025 is among the freshest credential material circulating on dark web markets and Telegram channels right now. The 19,438 records in this dataset likely belong to services the victims are still actively using, making account takeover and identity theft an immediate and realistic threat. Financial fraud is a common outcome when banking or payment login URLs appear in a log. Credential stuffing attacks powered by datasets like this one are responsible for millions of account compromises every year. Because many people reuse passwords across platforms, a single record in this file can unlock accounts on seperate and completely unrelated services the victim never imagined were at risk.

How Stealer Logs Work

Stealer malware arrives through phishing links, trojanized applications, or browser extensions that appear entirely legitimate. Once installed, the malware operates silently and hooks into the browser's autofill and form-fill systems. Every time the victim logs into any website, the malware captures the username, password, and URL and packages them into a log entry. These entries accumulate over weeks or months as the victim uses their device normally, with no indication that anything has occured. The attacker retrieves completed log files from a remote server, organizes them by count or category, and uploads them to Telegram or dark web forums for distribution. The butterfly_logs naming pattern and the 541count label indicate this is part of a larger organized operation producing multiple log batches in sequence.

Check If You Are Affected

HEROIC offers a free dark web scanner that checks your email against more than 400 billion leaked records, including recent stealer log uploads like butterfly_logs 541count. If your credentials appear in this dataset or in any of the thousands of breeches indexed in the HEROIC database, you will receive an alert with specific steps to secure your accounts immediately. Do not wait for an attacker to find your data first. Run a free scan at HEROIC.com right now.