Retemex Breach: 23,800 Mexican Mobile User Credentials Leaked

HEROIC's DarkHive intelligence system detected the Retemex database breach, which exposed 23,800 records from the Mexican virtual mobile operator. The incident occured in August 2024 and was discovered on August 29, 2024, when a database dump appeared on a Telegram channel frequented by threat actors targeting Latin American organizations. The exposed records included email addresses, phone numbers, full names, and critically, both SHA1 password hashes and plaintext passwords belonging to Retemex subscribers.

Why This Is Dangerous

The presence of plaintext passwords in this breach is a severe red flag indicating that Retemex stored user credentials without any encryption. Attackers who download this data face zero barriers to immediate account takeover. SHA1 password hashes are also easily cracked using rainbow tables and GPU-accelerated tools, meaning even hashed credentials provide only minimal additional protection. With full names, phone numbers, and email addresses also exposed, criminals can launch highly targeted phishing campaigns or use the phone numbers to conduct smishing attacks against affected users.

What Was Exposed

• Email Addresses
• Phone Numbers
• Password Hashes (SHA1)
• Plaintext Passwords
• First Names
• Last Names

Why This Matters

Credential stuffing attacks immediately follow breaches like this one. Every plaintext password paired with an email address gets tested against banking sites, email providers, social media platforms, and corporate login portals. Users who reused thier Retemex password on any other account face immediate account compromise. The SHA1 hashes are cracked within hours using widely available tools, extending the same risk to anyone whose password was stored in that format. For enterprises with Mexican operations or suppliers, employees whose contact details appear in this breach should be treated as heightened social engineering targets.

How Database Breach Works

Database breaches at smaller regional providers like Retemex often result from SQL injection vulnerabilities in web application code or from direct access to misconfigured database servers that lack proper authentication controls. Attackers run automated scanning tools to discover exposed database ports across the internet, then extract entire customer tables using standard database query commands. The stolen data is then packaged and sold or freely shared on Telegram channels that specialize in regional dumps. Smaller organizations are frequently targeted because they have fewer security resources to detect or prevent seperate intrusion attempts.

Check If You Are Affected

HEROIC offers a free identity scanner that searches over 400 billion records, including data from breaches like the Retemex incident from August 2024. Visit heroic.com to scan your email address and find out if your credentials or personal information were exposed in this or any other data breach.