Researchers Link the LuffichCloud Log to 11,548 Stolen US Credentials

In May 2023, the LuffichCloud stealer log appeared on Telegram without fanfare, uploaded by an anonymous user. HEROIC analysts detected the file in the channel and found 11,548 records inside, each containing an email address, a plaintext password, and the login URL for the site where that credential was in use. The data came from compromised endpoints in the United States. Many victims likely never recieve any notification that their credentials had been captured and shared.

Why This Is Dangerous

This is not a case of a company's server being hacked and a database being dumped. LuffichCloud is a stealer log, meaning the data was collected by malware installed on individual devices. Each record represents a real person who had infostealer software quietly running on their computer. The credentials captured were not just stored passwords, they were active logins being used at the time of infection. The combination of email, plaintext password, and site URL in a single record is particularly valuable because it eliminates guesswork entirely. Automated attack tools can process these records at scale, hitting dozens of platforms per second.

What Was Exposed

• Email addresses tied to live accounts
• Plaintext passwords, fully readable without any decryption
• Login URLs confirming which specific services were compromised

Why This Matters

Stealer log data does not expire the way a news cycle does. Cybercriminals store these files and test credentials against new platforms for months or years after the initial leak. If any of the 11,548 affected users haven't updated their passwords or haven't realised they were compromised, their accounts are still vulnerable today. Even accounts that weren't the original target can fall victim if the same password was reused across seperate services. This pattern has occured in numerous cases where a single stealer log triggered account takeovers on banking, email, and social media platforms far beyond the original target service.

How Stealer Log Breaches Work

Infostealer malware is typically spread through convincing phishing emails, pirated software downloads, or malicious browser extensions. Once installed on a device, it runs silently in the background, recording passwords saved in browsers, capturing cookies that keep users logged in, and monitoring new login activity. The collected data flows back to a server controlled by the threat actor. From there, it is sorted, packaged, and uploaded to distribution channels, including Telegram groups where cybercriminals share or sell credential bundles. The LuffichCloud channel was accessed by threat actors before HEROIC detected and cataloged the file. Given how these channels typically operate, multiple parties likely obtained the data before any takedown was possible.

Check If You Are Affected

HEROIC's free breach scanner contains more than 400 billion records, including stealer logs like LuffichCloud. A scan takes seconds and will show you every known breach your email address has appeared in. Enter your email at the HEROIC breach scanner to check whether your credentials are currently exposed on the dark web and take action before someone else does.