Everyday US Users Targeted in the 13,739 Record Monster Cloud Free 10 Stealer Log

In October 2023, analysts tracking threat actor activity on Telegram discovered a stealer log file uploaded under the label "Monster Cloud Free 10." The file contained 13,739 records harvested from compromised user endpoints in the United States. Every record in the log included an email address, a plaintext password, and the URL of a service the victim had been using. The log was distributed freely on a public Telegram channel, meaning anyone who found it could immediately begin exploiting the data with no cost or special access needed.

Why This Is Dangerous

The victims in this breach are ordinary internet users -- people who logged into streaming services, email providers, online shopping sites, and work platforms. Stealer malware does not discriminate by technical skill level or job title. Once it infects a device, it silently captures everything saved in the browser. An attacker with this log knows not just your password but also which websites you use, allowing them to build a precise attack profile. With plaintext passwords in hand, there is no barrier between the attacker and your accounts.

What Was Exposed in the Monster Cloud Free 10 Breach

• Email addresses
• Plaintext passwords (unencrypted, immediately usable)
• URLs of services and platforms victims logged into
• Endpoint and API host details

Why This Matters

Thirteen thousand credential sets distributed freely on Telegram means the data spreads fast and reaches many criminal hands. The risk extends beyond the original breach -- these credentials get fed into credential stuffing tools that automaticly test them against banks, email providers, healthcare portals, and social media platforms. Password reuse is common, which means a single exposed password can unlock multiple accounts. The personal data exposed here also enables identity theft, fraudulent account creation, and targeted phishing attacks against the victims.

How Stealer Log Breaches Work

Infostealer malware spreads through malicious email attachments, pirated software, or compromised websites that trigger drive-by downloads. Once running on a victim's device, the malware accesses the browser's password store, saved form data, and session tokens. It builds a structured log containing credentials and the URLs they correspond to, then sends that data back to the attacker. The resulting log files are either sold to other criminals or posted publicly -- as happened here on Telegram. The infection is often invisble to the victim because the malware is designed to avoid detection and remove itself after exfiltration.

Check If You Are Affected

Your email or password may appear in this Monster Cloud Free 10 log. HEROIC's free breach scanner checks against over 400 billion compromised records to tell you if your credentials have been exposed in this or any other known breach. Enter your email now to find out what data is out there and what you need to do to secure your accounts.