SMTP Stealer Leak From a Telegram User Exposes 2,008 US Passwords

HEROIC analysts flagged a fresh stealer log circulating on Telegram in July 2025, cataloged simply as SMTP uploaded by a Telegram User. Inside the file were 2,008 individual records, each pairing an email address, a URL or login endpoint, and a plaintext password. The log appears to have been harvested directly from infected devices whose owners logged into SMTP and webmail services without realizing malware was recording every keystroke.

Why This Is Dangerous: What 2,008 Exposed SMTP Credentials Let an Attacker Do

Email is the master key to almost everything else online. When an attacker gets a working email address and its plaintext password, they don't just get access to that inbox, they get access to every "forgot password" link tied to it. Someone who recieved this SMTP stealer log could reset banking passwords, hijack social media profiles, or send convincing phishing emails from a real, trusted account. Because the passwords in this dump are stored in plaintext rather than hashed, there is no encryption standing between the data and immediate misuse.

What Was Exposed in the SMTP Telegram Stealer Log

• Email addresses tied to SMTP and webmail login sessions
• Plaintext passwords, unprotected by hashing or encryption
• URLs and login endpoints showing exactly which service each credential unlocks

Why This Matters: From Credential Stuffing to Full Account Takeover

Most people reuse the same email and password combination across multiple sites. That habit is exactly what makes a small leak like this one so risky. Criminals feed exposed credentials into automated tools that test them against banking portals, shopping accounts, and cloud storage services, a technique known as credential stuffing. A single reused password can quietly unravel into identity theft, financial fraud, or a total account takeover before the victim even notices somthing is wrong.

How a Stealer Log Breach Like This One Works

Stealer logs come from infostealer malware, a type of program quietly installed on a victim's computer, often through a cracked software download or a malicious email attachment. Once active, it scans the browser for saved passwords, autofill data, and active login sessions, then bundles everything into a text file and sends it back to the attacker, often before the victim realizes anything occured. These files are frequently repackaged and uploaded to Telegram channels, where they trade hands for free or for a small fee, giving thousands of criminals instant access to the stolen logins.

Check If Your SMTP Credentials Were Exposed

If you have ever logged into an email or SMTP service from a device that might have been compromised, it's worth finding out now rather than later. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including this SMTP stealer log, and shows you immediately if your credentials have surfaced on the dark web. Scan your email now and take back control before an attacker gets there first.