US Users Hit: 339 PCS CLOUD_COSMIC Stealer Log Exposes 4,954 Records

HEROIC analysts identified a stealer log file posted to a public Telegram channel on December 20, 2022. The log, labeled "339 PCS - 20.12.2022 CLOUD_COSMIC," exposed 4,954 records belonging largely to users in the United States. The data was harvested by infostealer malware running silently on infected computers, then packaged and shared openly on Telegram where anyone could download it.

Why This Is Dangerous

Every record in this dump includes a real email address, a real password, and the website it belongs to. An attacker does not need to crack anything. They can take those credentials and try them on banking sites, email inboxes, shopping accounts, and workplace logins within minutes. Because many people reuse the same password across multiple sites, a single stolen credential can unlock severel accounts at once.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs (the websites the passwords belong to)

Why This Matters

Stealer log dumps like this one feed directly into some of the most comman cyber attacks people face today:

• Credential stuffing: Attackers run your email and password against hundreds of websites automatically.
• Account takeover: Once inside your email, criminals can reset passwords for your bank, social media, or work accounts.
• Identity theft: Personal details found inside accounts are used to open new credit lines or file fraudulent tax returns.
• Financial fraud: Direct access to payment accounts, gift card portals, or e-commerce profiles leads to immediate monetary loss.

How Stealer Logs Work

An infostealer is a type of malware that runs in the background on your computer without you knowing. It watches your browser for saved passwords, session cookies, and login forms. When you visit a website and enter your credentials, the malware captures that information silently. The stolen data is then compressed into a log file and sent to the attacker, who may sell it or post it freely on Telegram or dark web forums. The "339 PCS" label simply means 339 individual log files were bundled together in one upload.

Check If You Are Affected

HEROIC has indexed this breach in its database of over 400 billion exposed records. If your email address appears in this or any similar stealer log, you will recieve an alert. Use HEROIC's free breach scanner to search your email right now and find out if your credentials are circulating on Telegram or the dark web.

Search your email for free at HEROIC.com