Paraguay Issues Warning of Black Hunt Ransomware Attacks Following Tigo Business Breach

Paraguay's military has issued a warning about potential Black Hunt ransomware attacks following a cyberattack on Tigo Business, the largest mobile carrier in Paraguay. Tigo Business, which provides digital solutions to enterprises, suffered a security incident impacting cloud and hosting services. Reports on social media suggest that the Black Hunt ransomware operation was responsible, encrypting over 330 servers and compromising backups. Although Tigo confirmed the attack, they stated that internet, telephone services, and Tigo Money electronic wallets were unaffected.

Security Officer Comments:
Paraguay's General Directorate of Information and Communication Technologies later issued an official alert about the ransomware, impacting over 300 associated companies. The Black Hunt ransomware, targeting companies in South America, encrypts files and appends specific extensions. While the ransom notes claim data theft, there is no evidence of data leaks, though the extent of exposure remains uncertain due to the attackers' full access to encrypted devices.

Suggested Corrections:
Backup your data, system images, and configurations, regularly test them, and keep the backups offline: Ensure that backups are regularly tested and that they are not connected to the business network, as many ransomware variants try to find and encrypt or delete accessible backups. Maintaining current backups offline is critical because if your network data is encrypted with ransomware, your organization can restore systems.

Update and patch systems promptly: This includes maintaining the security of operating systems, applications, and firmware in a timely manner. Consider using a centralized patch management system; use a risk- based assessment strategy to drive your patch management program.

Test your incident response plan: There's nothing that shows the gaps in plans more than testing them. Run through some core questions and use those to build an incident response plan: Are you able to sustain business operations without access to certain systems? For how long? Would you turn off your manufacturing operations if business systems such as billing were offline?

Check Your Security Team's Work: Use a 3rd party pen tester to test the security of your systems and your ability to defend against a sophisticated attack. Many ransomware criminals are aggressive and sophisticated and will find the equivalent of unlocked doors.

Segment your networks: There's been a recent shift in ransomware attacks – from stealing data to disrupting operations. It's critically important that your corporate business functions and manufacturing/production operations are separated and that you carefully filter and limit internet access to operational networks, identify links between these networks and develop workarounds or manual controls to ensure ICS networks can be isolated and continue operating if your corporate network is compromised. Regularly test contingency plans such as manual controls so that safety critical functions can be maintained during a cyber incident.

Train employees: Email remains the most vulnerable attack vector for organizations. Users should be trained how to avoid and spot phishing emails. Multi Factor authentication can help prevent malicious access to sensitive services.