Cyber Incident Victim: Prefeitura Municipal de Uruguaiana
Date:
Nov 2024
Location:
Brazil
Summary
The Prefeitura Municipal de Uruguaiana suffered a cyberattack where threat actors encrypted files across all municipal departments, demanding a $10,000 ransom in digital currency. Despite engaging encryption specialists, recovery efforts failed due to the attack's complexity, though essential systems like payroll, invoicing, and creditor payments remained operational, maintaining core administrative services. This incident reflects a broader trend of escalating cyberattacks targeting Brazilian municipal administrations, including major cities like Porto Alegre and Rio de Janeiro. The municipality is collaborating with authorities and experts to investigate and mitigate impacts, highlighting urgent data protection needs for public institutions.
| CIA Posture | Motives | Tactics, Techniques & Procedures |
|---|---|---|
| Available to members | 1 motive | 1 technique |
| Threat Actors | Type | Location |
|---|---|---|
| 0 actors | Available to members | Available to members |
Description
On November 25, 2024, the Municipal Prefecture of Uruguaiana in Rio Grande do Sul state, Brazil, publicly disclosed a cyberattack that compromised its administrative systems. Attackers encrypted files across all municipal secretariats, rendering data inaccessible, and demanded a ransom payment of $10,000 in cryptocurrency (approximately R$60,000 based on Bitcoin exchange rates at the time). The ransomware attack targeted stored files but did not disrupt essential operational systems, allowing core administrative functions like payroll processing, tax invoice issuance, and creditor payments to continue without interruption. Municipal authorities engaged specialized encryption recovery firms immediately after detecting the incident, but restoration attempts proved unsuccessful due to the attack's technical sophistication. No data destruction or exfiltration was mentioned in official communications, though the full scope of encrypted records remained unspecified. Service continuity measures prevented operational collapse despite the ongoing data inaccessibility affecting unspecified non-critical functions.
The incident occurred amid escalating ransomware campaigns against Brazilian municipal governments throughout 2024, with major cities including Porto Alegre and Rio de Janeiro experiencing similar attacks. Uruguaiana's administration collaborated with cybersecurity experts and law enforcement agencies to investigate the intrusion while maintaining unaffected critical services. No evidence suggested citizen-facing services experienced outages, though internal document access remained impaired. The attack highlighted systemic vulnerabilities in municipal IT infrastructure across Brazil, demonstrating threat actors' increasing capability to disrupt local governments despite preserved core operations. Recovery efforts continued without confirmation of data restoration success at the time of reporting, with authorities focusing on forensic analysis rather than ransom payment considerations. This event reinforced documented patterns of ransomware targeting under-resourced public sector entities throughout the year.