Telefonica.net Users Targeted in a 123-Record Password Leak

In August 2024, HEROIC analysts identified a stealer log targeting Telefonica.net webmail users, uploaded by a Telegram user, exposing 123 records made up of email addresses, plaintext passwords, and the URLs each login was used on.

Who This Leak Actually Targets

Telefonica.net is a webmail service tied to one of Spain's largest telecom providers, so the people in this log are overwhelmingly Spanish-speaking users who rely on this address for everyday email. A leak built around a single email provider like this one usually means the attacker specifically filtered their stolen data to isolate that group, making it easier to sell or use against a known population rather than a random mix of accounts.

What Was Exposed

• Telefonica.net email addresses
• Plaintext passwords, readable with no need to crack or decrypt
• URLs identifying the exact login page each credential was used on

Why This Matters

An email account is often the recovery point for banking, shopping, and social media logins, so a compromised Telefonica.net address can open the door to accounts far beyond webmail. Anyone in this file who reused their email password elsewhere faces a real risk of credential stuffing, account takeover, and, if financial accounts share the same password, fraud.

How Provider-Specific Stealer Logs Get Built

Stealer malware records every login typed into an infected browser, then the operators sort the raw data by email domain to create smaller, targeted files like this one. Isolating Telefonica.net accounts makes the log more valuable to buyers focused on Spanish users, since it saves them the work of filtering a larger, mixed dataset themselves. The file is then uploaded to Telegram channels that specialize in trading this kind of narrowly targeted access.

Check If You Are Affected

If you use a Telefonica.net address, it is worth confirming your account was not part of this leak. HEROIC's free breach scanner checks your email against a database of more than 400 billion breached and leaked records, so you can see your exposure in seconds and update any reused passwords.