The CLOUDCOSMIC Dump Contains Exactly 4,975 Email and Password Pairs

In July 2023, HEROIC analysts added a stealer log to our breach database that had been distributed on Telegram under the file name 351 PCS - 11.07.2023 CLOUDCOSMIC. The file exposed 4,975 records gathered from 351 compromised machines, each record containing an email address, a plaintext password, and the URL of the account those credentials were tied to. The data was collected silently by information-stealing malware before being packaged and uploaded to a private Telegram channel.

The risk here is immediate and practical. When an attacker receives a file like this, they do not need to do any additional work to begin using the credentials. Every login is labeled, readable, and ready to test against live accounts.

What the CLOUDCOSMIC File Exposed

The 4,975 records in this dataset each contained:

• Email addresses tied to the compromised accounts
• Plaintext passwords captured directly from infected browsers and devices
• URLs identifying which services and websites the credentials belonged to

Why CLOUDCOSMIC Credential Data Fuels Real-World Attacks

Stealer log data like the CLOUDCOSMIC file is among the most operationally useful material that cybercriminals trade. Because the passwords are plaintext and paired with the exact site they unlock, this data is a direct input for credential stuffing tools that can test thousands of login attempts across hundreds of platforms automatically.

If any of the affected users recieved the CLOUDCOSMIC malware on a device they also used for banking, healthcare, or work accounts, those platforms are now at risk too. Password reuse is extremely common, and attackers know this. A single exposed credential can open doors far beyond the original compromised service.

The consequences range from account takeover and identity theft to financial fraud and unauthorized access to employer systems. Each leaked record is a potential entry point into a much larger set of the victim's digital life.

How the CLOUDCOSMIC Stealer Log Was Assembled

The "351 PCS" designation in the file name indicates that the upload contained log packages from 351 individual infected machines. Each machine was compromised by an information stealer, a type of malware that runs silently in the background and systematically harvests saved browser credentials, session tokens, and autofill data.

CLOUDCOSMIC is the name used by the threat actor or distribution channel that organized and shared this particular batch. Once the malware finishes its harvest on a victim's computer, the data is exfiltrated to a collection server. It is then sorted, formatted, and redistributed through Telegram channels to other criminals who may use it for stuffing attacks, phishing, or direct account takeovers. The infected users typically have no idea anything has occured until they notice unusual account activity.

Unlike a traditional database breach, no company server was hacked here. The data was stolen directly from individual devices, which means the victims had no corporate security team watching over them at the moment of compromise.

Check If Your Data Appears in the CLOUDCOSMIC Stealer Log

HEROIC's free breach scanner searches across more than 400 billion indexed records, including stealer log datasets like the CLOUDCOSMIC file. If your email address or password appears in this batch or any related stealer log, the scanner will identify it so you can act quickly.

Run your free check at heroic.com/scan. If your informaton is in this dataset, change the exposed password everywhere it has been used, enable two-factor authentication on all important accounts, and review recent login activity for anything suspicious.