How the ShadowLogs_Cloud Stealer Log Collection Led to 8,241 Stolen Credentials

In October 2023, HEROIC analysts found a collection of 504 stealer log files that had been uploaded to a cloud distribution point by an anonymous Telegram user operating under the ShadowLogs_Cloud label. The collection contained 8,241 records in total, each consisting of an email address, a plaintext password, and the URL of the site from which the credential was stolen. The files were structured and labeled in a way consistent with organized infostealer operations, where harvested credentials are bundled, sorted, and shared across Telegram channels and underground communities. The data was publicly accessible at the time of discovery, making it available to any actor monitoring those channels.

Why This Is Dangerous

The ShadowLogs_Cloud collection is particularly dangerous because it arrived in 504 seperate files, suggesting the credentials were harvested across a wide range of victims and geographic locations rather than a single compromised service. Each record maps a real email address to a working plaintext password and the exact site it came from, giving attackers a ready-made credential stuffing list that requires zero additional processing. With plaintext passwords in hand, attackers can attempt logins immediately across email providers, financial services, corporate platforms, and any other site where the victim may have reused that password. The multi-file structure also makes it easier to sort and filter victims by domain or service type, enabling targeted attacks.

What Was Exposed in the ShadowLogs_Cloud 504 Files Upload

• Email addresses
• Plaintext passwords
• URLs associated with the stolen credentials

Why This Matters

Stealer log collections distributed through Telegram and cloud platforms like this one are among the most direct threats to everyday account security. The credentials do not need to be cracked or decoded, they are ready to use. For anyone whose data appears in this collection, the risk includes credential stuffing attacks against their other accounts, phishing campaigns using their known email and service associations, account takeover, identity theft, and financial fraud. Even if only one password is reused across two services, the exposure multiplies. The 8,241 records here represent real people whose accounts are actively at risk every day this data remains in circulation.

How Stealer Logs Work

The ShadowLogs_Cloud collection was built using infostealer malware, a category of malicious software specifically designed to extract saved credentials from infected devices. The malware is typically installed through phishing emails, pirated software, or malicious browser extensions. Once active on a device, it silently sweeps through browser credential stores, saved autofill data, password manager caches, and desktop application login data. All of this is then compiled into structured log files and automatically transmitted to an attacker-controlled collection point. Operators then sort, bundle, and distribute these logs through Telegram channels and file hosting services. The process from initial infection to public distribution can occure in as little as a few hours, and most victims are completely unaware their credentials have been stolen until they recieve an unauthorized access notification.

Check If You Are Affected

HEROIC's free dark web scanner searches across more than 400 billion exposed records, including stealer log collections like ShadowLogs_Cloud. Enter your email address to instantly find out whether your credentials appear in this dataset or any other known breach. Detection is the first step, and HEROIC gives you the actionable information you need to secure your accounts before an attacker gets there first.