Sensitive UENO Bank Data Breach Exposes Customer Details

Data Breach Summary

A severe data breach reportedly impacted UENO Bank, one of Paraguay’s largest banking institutions, as revealed by user ueno_killer on darkforums.st in August 2025. The compromised dataset includes highly sensitive customer information:

• Full names, mobile phone numbers, email addresses, birth dates, and residential addresses

• Transaction details, partial credit card numbers, loan information, credit scores, KYC forms, and more

• Sample transaction codes showing both issuer and beneficiary details, including account numbers and SWIFT codes

• Where and How?

  This leak was published in August 2025 by user ueno_killer on darkforums.st, pointing directly to highly sensitive data from UENO Bank in Paraguay. The exposed contents suggest a broad compromise of both transactional and personal customer data, potentially stemming from internal systems or backups.

  Several online sources monitoring dark web discussions have noted:

  • Outlets like VECERT mention that the breach involves full names, phone numbers, email addresses, birth dates, addresses, transactions, partial credit card numbers, loans, credit scores, and KYC forms.
  • Social media activity on platforms like X (formerly Twitter) highlighted the leak as “UENO Bank Customer Data — 200K FREE + UP TO DATED! [Paraguay]”

Company Data Breach History

There have been no confirmed public reports or official statements regarding prior breaches affecting UENO Bank. No announcements or investigations have appeared in mainstream media or the bank’s official communication channels (e.g., its website)—this appears to be the first time such a serious leak has been made public.

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Further Action

To address the leak effectively, the following steps are highly recommended:

1. Initiate an immediate internal investigation to confirm the scope and source of the data breach.
2. Alert affected customers and regulatory bodies about potential data exposure.
3. Invalidate compromised credentials and implement credit monitoring or identity protection for affected individuals.
4. Strengthen security across systems storing customer data (e.g., encryption, access controls, rigorous audit logging).
5. Communicate transparently with stakeholders regarding the incident and response measures.

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Recommendations for Personal Data Protection

Although the breach involves institutional data, individual customers should remain vigilant:

• Monitor accounts and transaction histories for suspicious activity.
• Enable multi-factor authentication wherever possible.
• Be alert to phishing attempts that may exploit leaked personal information.
• Consider placing fraud alerts or protective freezes with credit bureaus.

What is InsecureWeb?

InsecureWeb is a Dark Web monitoring service that keeps track of recent data breaches and tracks their impact by monitoring the darkest places of the internet.

Our commitment lies in providing top-notch cybersecurity services to our clients. Through continuous monitoring of the dark web and advanced threat detection methodologies, we strive to identify potential breaches promptly, enabling swift response and mitigation efforts. With our state-of-the-art tools and expertise, we prioritize the confidentiality, integrity, and availability of our clients’ data.