CONFIRMED RANSOMWARE ATTACKS · COUNTRY
Ransomnews has confirmed 157 ransomware attacks in Brazil between September 2018 and September 2026, each one verified against a public source such as a breach notification, regulatory filing, court record or press report. That is 1.6% of the 9,715 confirmed incidents in the dataset. So far in 2026, 9 have been confirmed, against 13 in 2025 and 22 in 2024. The most affected sector is government, with 74 confirmed victims (47%). São Paulo is the city with the most confirmed victims, at 30. Where the operator is attributed, LockBit leads with 10 confirmed victims. A ransom payment is on the public record in 2 cases and a refusal in 31; the outcome is unrecorded in the remaining 124.
Confirmed ransomware attacks in Brazil by year
The current year is a partial count. Confirmation lags the attack itself, so recent months keep filling in after the fact; read a low figure for the latest year as incomplete rather than as a decline.
| Year | Confirmed attacks | Ransom paid (public) | Ransom refused (public) |
|---|---|---|---|
| 2018 | 1 | 0 | 0 |
| 2019 | 8 | 0 | 3 |
| 2020 | 26 | 0 | 4 |
| 2021 | 35 | 0 | 5 |
| 2022 | 24 | 2 | 3 |
| 2023 | 19 | 0 | 6 |
| 2024 | 22 | 0 | 4 |
| 2025 | 13 | 0 | 4 |
| 2026 (year to date) | 9 | 0 | 2 |
Which ransomware groups attack organisations in Brazil most
The operator is attributed in 87 of the 157 confirmed incidents. Counts are confirmed victims, not leak-site claims, so they run well below the totals the groups publish about themselves. Group names link to the live Ransomtracker profile where one exists.
Most active groups by confirmed victims
Where the confirmed attacks in Brazil fall
Most affected sectors
Cities with the most confirmed victims
Ransom payment outcomes in Brazil
Among the 33 confirmed incidents in Brazil where the outcome is on the public record, 2 paid and 31 refused, a disclosed payment rate of 6.1%. The remaining 124 carry no public statement either way. Victims that pay have every incentive to stay quiet and public bodies are the most likely to announce a refusal, so treat this as the disclosed rate, not the true one. The ransomware payment rate analysis explains how the disclosed rate has moved since 2018 and how it compares with incident-response firm samples.
Largest confirmed ransomware attacks in Brazil by records exposed
Record counts are recorded only where a named source disclosed them, which is the minority of cases, so this table ranks disclosed impact rather than true impact.
| Date | Organisation | Sector | Location | Records | Group | Ransom paid | Source |
|---|---|---|---|---|---|---|---|
| January 2025 | Instituto Saúde e Cidadania (ISAC) | Healthcare | Brasília, Brazil | 500,000 | — | Unknown | cnnbrasil.com.br |
Most recent confirmed ransomware attacks in Brazil
The 25 most recently confirmed of 157 incidents, newest first. Every row links to the public source it was verified against.
| Date | Organisation | Sector | Location | Records | Group | Ransom paid | Source |
|---|---|---|---|---|---|---|---|
| September 2026 | Câmara Municipal de Vereadores de Venâncio Aires | Government | Venâncio Aires, Brazil | — | — | No | folhadomate.com |
| August 2026 | Itaguaí Construções Navais (ICN) | Manufacturing | Itaguaí, Brazil | — | LockBit | Unknown | jornalatual.com.br |
| July 2026 | Mato Grosso do Sul State Gas Company (MSGÁS) | Government | Campo Grande, Brazil | — | Blackwater | Unknown | amp.campograndenews.com.br |
| June 2026 | AmorSaúde | Healthcare | São Paulo, Brazil | — | LockBit | Unknown | tribunaconservadora.com.br |
| March 2026 | Secretaria de Estado de Saúde de Mato Grosso | Government | Cuiabá, Brazil | — | LockBit | No | revistaoeste.com |
| February 2026 | Fundação Getulio Vargas | Education | Rio de Janeiro, Brazil | — | DragonForce | Unknown | oglobo.globo.com |
| February 2026 | Universidade Federal de Sergipe | Education | São Cristóvão, Brazil | — | The Gentlemen | Unknown | ufs.br |
| February 2026 | Centro Universitário Filadélfia (UniFil) | Education | Londrina, Brazil | — | The Gentlemen | Unknown | instagram.com |
| January 2026 | Unimed Anápolis | Healthcare | Anápolis, Brazil | — | The Gentlemen | Unknown | unimed.coop.br |
| December 2025 | Klingele Paper Nova Campina Ltda. | Manufacturing | Nova Campina, Brazil | — | INC | Unknown | klingele.com |
| December 2025 | Prefeitura de São João da Ponte | Government | São João da Ponte, Brazil | — | — | No | otempo.com.br |
| October 2025 | Unimed do Brasil | Healthcare | Porto Alegre, Brazil | — | Sarcoma | Unknown | unimed.coop.br |
| September 2025 | MedicSolution | Healthcare | Palotina, Brazil | — | KillSec | Unknown | resecurity.com |
| July 2025 | Universidade Católica de Pernambuco (UNICAP) | Education | Recife, Brazil | — | — | Unknown | securityleaders.com.br |
| July 2025 | Serviço Autônomo de Água e Esgoto de Barretos (SAAEB) | Government | Barretos, Brazil | — | — | Unknown | saaeb.com.br |
| June 2025 | Prefeitura de Porto Nacional | Government | Porto Nacional, Brazil | — | — | No | folhadobico.com.br |
| June 2025 | Prefeitura de São José do Rio Preto | Government | São José do Rio Preto, Brazil | — | — | Unknown | rarduer.com |
| May 2025 | Prefeitura de Chapadão do Sul | Government | Chapadão do Sul, Brazil | — | — | No | securityleaders.com.br |
| May 2025 | Grupo Jorge Batista (Drogarias Globo, Distribuidora Nazaria) | Healthcare | Floriano, Brazil | — | Gunra | No | gp1.com.br |
| March 2025 | Instituto de Pesquisas Energéticas e Nucleares (IPEN) | Government | São Paulo, Brazil | — | — | Unknown | noticias.r7.com |
| March 2025 | Prefeitura Municipal de Ivinhema | Government | Ivinhema, Brazil | — | — | Unknown | aconteceums.com.br |
| January 2025 | Instituto Saúde e Cidadania (ISAC) | Healthcare | Brasília, Brazil | 500,000 | — | Unknown | cnnbrasil.com.br |
| November 2024 | Prefeitura de Uruguaiana | Government | Uruguaiana, Brazil | — | — | No | securityleaders.com.br |
| November 2024 | Lojas Marisa | Retail | São Paulo, Brazil | — | Medusa | Unknown | tecmundo.com.br |
| October 2024 | Prefeitura de Guajará-Mirim | Government | Guajará-Mirim, Brazil | — | — | Unknown | securityleaders.com.br |
Frequently asked questions
How many ransomware attacks in Brazil have been confirmed?
Ransomnews has confirmed 157 ransomware attacks in Brazil since September 2018, including 9 so far in 2026. Each one is verified against a public source such as a breach notification, regulatory filing or press report. The true total is higher, because many victims never disclose; confirmed counts are a floor, not a ceiling.
Which ransomware group is most active in Brazil?
LockBit, with 10 confirmed victims, followed by Prometheus (7) and RansomEXX (5). These are confirmed victims, not leak-site claims, counted among the 87 incidents where the operator is attributed.
Which sector is hit most by ransomware in Brazil?
Government, with 74 confirmed incidents (47% of the total). Healthcare follows with 21, then Finance with 10.
Which cities in Brazil have the most confirmed ransomware attacks?
São Paulo (30), Rio de Janeiro (14), Brasilia (11), Campinas (3), Curitiba (3). City is recorded where the victim organisation is headquartered or the incident was reported, so distributed organisations are counted once.
How often do ransomware victims in Brazil pay the ransom?
Among the 33 confirmed incidents in Brazil with a public outcome, 2 paid and 31 refused, a disclosed payment rate of 6.1%. Most victims never state whether they paid, and those who pay have the least reason to say so, so the disclosed rate understates real payment behaviour. The payment rate analysis tracks this figure since 2018.
What is the largest confirmed Brazil ransomware attack by records exposed?
Instituto Saúde e Cidadania (ISAC) (Brasília, Brazil, January 2025), with 500,000 records exposed according to cnnbrasil.com.br. Record counts exist only where a source disclosed them, so this ranks disclosed impact.
How to read this page. Every incident counted here was verified by Ransomnews against at least one public source. Leak-site listings alone do not qualify, because operators inflate, duplicate and occasionally fabricate claims, so these totals are a defensible floor rather than a full census. Records exposed and ransom outcomes appear only where a named source disclosed them. The page is regenerated from the live database, which refreshes weekly. Cite as: Ransomnews Confirmed Ransomware Attacks Dataset, ransomnews.com, with a link to this page. Bulk access and methodology questions: [email protected]. See also the monthly ransomware statistics and the Ransomtracker.