Researchers Link butterfly_logs 580count to 23,119 Stolen Credentials on Telegram

Researchers Confirm butterfly_logs 580count Exposed 23,119 Stolen Credentials on Telegram

HEROIC analysts reviewed the butterfly_logs 580count dataset, a stealer log file uploaded to Telegram in July 2025 containing 23,119 records of compromised account data. The information was collected by infostealer malware operating silently on victims' devices and includes email addresses, plaintext passwords, and endpoint URLs. The dataset was shared on a Telegram channel frequented by threat actors, making it instantly available to anyone looking to exploit stolen credentials for unauthorized account access.

Why This Data Is Dangerous

Plaintext passwords are immediately exploitable. Unlike bcrypt or SHA-256 hashed passwords which require significant compute time to crack, these are raw, readable credentials that can be fed directly into automated attack tools. With 23,119 email-password-URL combinations in one file, a single threat actor can automate thousands of login attempts across banking sites, email providers, and enterprise platforms within hours. The URL component of each record is particularly useful to attackers because it removes the guesswork about where to try each credential.

What Was Exposed

The butterfly_logs 580count stealer log contained the following data categories:

• Email Addresses
• Plaintext Passwords
• URLs (endpoint and API host addresses)

Why This Matters to You

Infostealer campaigns do not target specific individuals; they infect whoever they can reach through phishing, cracked software, or malicious browser extensions. This means anyone in this dataset was simply in the wrong place at the wrong time. Once credentials are in a stealer log, they circulate indefinitely through credential stuffing attacks, account takeovers, and identity theft schemes. The seperate records in this file each represent a real person whose digital life is now more vulnerable than they realise.

How Stealer Log Breaches Work

Infostealer malware infects a device and immediately begins harvesting data. It targets browser-saved passwords, keystrokes, autofill data, session cookies, and the URLs of active login sessions. All of this is sent back to the attacker's command-and-control server in real time. The attacker then compiles these records into log files, which are sold or freely distributed on Telegram channels and dark web markets. The butterfly_logs naming convention suggests this was one of many batches produced by the same malware operation, with 580 log files compiled into a single upload. Most victims never find out this occured until they are locked out of their own accounts.

Check If Your Data Was Exposed

HEROIC provides a free scanner that checks your email address against more than 400 billion records from known data breaches and stealer log collections, including butterfly_logs 580count. If your credentials were captured, HEROIC will alert you so you can take immediate action: change your passwords, enable two-factor authentication, and monitor your accounts for suspicious activity. Scan for free at HEROIC today and find out if your data is already out there.