Search Your Email: The WhiteCloudFree Stealer Log Exposed 10,404 Passwords

HEROIC analysts identified a stealer log file distributed through Telegram in August 2023, catalogued under the name 20.08.23 - WhiteCloudFree. The file contained 10,404 records collected from infected devices, including email addresses, plaintext passwords, and the URLs of services those credentials belong to. This data was shared freely in a Telegram channel, meaning anyone who was a member could download and use it with no barriers.

Why This Is Dangerous

When a stealer log contains plaintext passwords alongside the email addresses and URLs they belong to, attackers have everything they need to log in immediately. There is no cracking required. A criminal can take any record from this file, visit the corresponding website, and attempt to sign in using the exact credentials captured from the victim's device. If that same email and password combination is used on other sites, such as banking portals, email inboxes, or social media accounts, those accounts are at risk too.

The fact that this data was uploaded to Telegram means it circulated widely before most victims had any idea their credentials were stolen. Stealer logs from 2023 are still actively used by threat actors today because most people never change their passwords unless forced to.

What Was Exposed

• Email addresses
• Plaintext passwords (no encryption, readable immediately)
• URLs of the services where those credentials were used

Why This Matters

Credentials paired with service URLs are among the most actionable data a criminal can possess. Unlike a list of usernames without context, this dataset tells attackers exactly where to try each password. This combination fuels credential stuffing attacks, where automated tools cycle through thousands of login attempts per minute across dozens of websites simultaneously.

Once an attacker gains access to even one account, the damage compounds quickly. Email account access allows password resets on linked services. Financial account access enables fraud. Social media takeovers are used for scams that target your contacts. The exposure of 10,404 records from this single stealer log represents thousands of people at ongoing risk.

How Stealer Log Malware Works

A stealer log is the output of a specific type of malicious software called an infostealer. These programs are typically installed on a victim's computer without their knowledge, often through a pirated software download, a malicious email attachment, or a compromised website. Once installed, the infostealer quietly scans the infected device for stored credentials.

Modern infostealers target saved passwords in browsers like Chrome, Firefox, and Edge, autofill data, session cookies, and any credentials typed into login forms. All of this is packaged into a compressed log file and sent back to the attacker. The attacker then sorts these logs, often by country or by the types of services found, and sells or distributes them through dark web markets or channels like Telegram.

The WhiteCloudFree log was distributed freely, meaning the threat actor's goal was volume and reputation rather than direct profit. Free distributions tend to reach more criminals and cause broader harm because there is no paywall limiting access.

Check If You Are Affected

If your email address appears in this stealer log, your password and the websites you use are known to attackers. HEROIC's free breach scanner searches across more than 400 billion exposed records, including stealer logs like this one, to tell you whether your information has been compromised. Enter your email address to find out within seconds whether you need to take action now.