If You Reuse Passwords, the 63_Boss Telegram Stealer Log Should Worry You

In June 2023, HEROIC's threat intelligence team identified a stealer log file uploaded to Telegram by a user operating as 63_Boss. The dataset exposed 2,891 records containing email addresses, plaintext passwords, and URLs tied to the services where the credentials were harvested. This type of upload is a routine tactic used by infostealer operators who collect logs from infected devices and distribute them through Telegram for financial gain or reputation building within cybercriminal communities.

Why This Is Dangerous

If you reuse passwords across multiple services, the 63_Boss stealer log should concern you directly. Plaintext passwords do not require any additional cracking and are immediatly usable. The URLs in the dataset identify the specific services each victim was using, allowing attackers to bypass guesswork and go straight for the accounts that matter most, including banking portals, email inboxes, and workplace systems. Password reuse multiplies the damage from any single compromised credential.

What Was Exposed

The 63_Boss Telegram stealer log exposed the following data types for each of the 2,891 compromised records:

• Email Addresses
• Plaintext Passwords
• URLs (endpoint and API host addresses)

Why This Matters

Even a dataset of under 3,000 records is highly dangerous when every credential is in plaintext and paired with target URLs. Attackers can use these 2,891 records to launch credential stuffing campaigns against banks, email providers, and social networks. Because most people reuse passwords, a single leaked set of credentials can unlock accross multiple platforms. The resulting exposure creates pathways to identity theft, financial fraud, and unauthorized access to business accounts.

How Stealer Log Breaches Work

Infostealer malware infects devices silently, often through phishing emails, pirated software, or malicious browser plugins. Once installed, it scans for saved passwords in web browsers, password managers, and email clients. Each credential is recorded alongside the URL of the site or service where it was saved. The malware then transmits these structured log files to a remote server or directly to a Telegram channel controlled by the operator. The 63_Boss upload is a typical example of how these logs get distributed to criminal audiences. Victims rarely know their device was infected until accounts start showing unauthorised access.

Check If You Are Affected

If you reuse passwords and your email address appears in the 63_Boss Telegram stealer log, your accounts are at serious risk right now. HEROIC's free breach scanner searches more than 400 billion exposed records to tell you exactly what data of yours has been compromised. Run a free search today and find out before cybercriminals do.