CLOUDCOSMIC Stealer Log: 6,795 Plaintext Passwords Exposed

In July 2023, a stealer log file surfaced on Telegram exposing 6,795 records tied to the CLOUDCOSMIC credential set. This wasn't a traditional corporate breach -- it was a stealer log, meaning real malware silently harvested login credentials from infected machines and bundled them into a file that was then shared openly on Telegram. The victims likely had no idea their data was being collectd and redistributed at the time.

What makes stealer logs particularly dangeros is that the data is fresh, real, and ready to use. Unlike old database dumps that may have stale passwords, stealer logs capture credentials as they were actively being typed or stored. That means every record in this dataset was live at the moment it was stolen.

A Closer Look at the CLOUDCOSMIC Leaked Data

The 6,795 records exposed in this stealer log breach included a combination of data types that together paint a very complete picture of each victims online activity:

• Email Addresses -- Used to identify and contact victims, and to attempt account recovery or phishing attacks.
• Plaintext Passwords -- The most dangerous element. These are raw, unencrypted passwords that can be used immediately without any cracking. No hashes, no guessing -- just direct access.
• URLs -- The specific websites where these credentials were used. This tells attackers exactly which accounts to target with each stolen email and password combo.

The combination of email, password, and the exact URL where that password was used creates what security researchers call a "combo list" -- the holy grail of credential theft data.

How the CLOUDCOSMIC Breach Enables Identity Fraud

When attackers have your email, plaintext password, and the URL where you used it, they have everything needed to walk straight into your accounts. This is the foundation of credential stuffing attacks, where automated tools blast stolen login pairs against hundreds of websites simultaneously. Since most people reuse passwords across multiple sites, a single stealer log entry can unlock accounts the victim doesn't even realize are at risk.

Account takeover follows naturally from stuffing. Once inside an email account, attackers can trigger password resets for banking, shopping, and social media accounts. Once inside a shopping account, they can redirect orders or harvest saved payment methods. The URL data in this breach makes targeting even more surgical -- attackers know exactly where each password was used, so they start with those sites first before branching out.

The Stealer log Ecosystem: Where Stolen Data Ends Up

Stealer logs don't stay in one place. After being posted on Telegram channels, they're typically aggregated into larger combo lists, sold on dark web marketplaces, and traded in private hacking forums. The CLOUDCOSMIC dataset from July 2023 has likely already cycled through several of these channels in the years since it was first uploaded.

Credential marketplaces on the dark web sell access to verified "working" accounts, often sorted by country, email provider, or website category. Buyers range from opportunistic script kiddies running automated stuffing tools to more sophisticated fraud operations targeting specific platforms. Once a credential set is in circulation, it tends to stay in circulation -- copies get made, shared, and merged with other stolen datasets over and over.

Check Your Risk: Search the CLOUDCOSMIC Breach Records

If your email address was among the 6,795 records exposed in this stealer log, your plaintext password and the websites you visited may be in the hands of cybercriminals right now. The best first step is to find out if you're in this dataset -- and HEROIC's breach search tool can tell you instantly.

HEROIC monitors over 400 billion compromised records across thousands of known breaches. Search your email address to see if it appeared in the CLOUDCOSMIC upload or any other known data breach. If you're exposed, change your passwords immediately, enable two-factor authentication on your most sensitive accounts, and watch for suspicious login attempts.