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Cyber Threat
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Ransomware victim Healthcare

chmsbc.org.br

Listed by Lockbit5 on · organisation based in Brazil

chmsbc.org.br

Disclosed
Dec 7, 2025
Leak-site listing date
Threat group
Lockbit5
401 victims listed
Country
Brazil
#7 most targeted
Sector
Healthcare

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Lockbit5. Figures and technique mappings are quoted from the source data, not inferred.

About the Lockbit5 group

LockBit 5.0 ("ChuongDong") emerged in September 2025 as the group's resurgence following the February 2024 law enforcement takedown, introducing cross-platform payloads targeting Windows, Linux, and VMware ESXi with enhanced evasion capabilities and continuing the RaaS affiliate model of its predecessors. Lockbit5 has listed 374 victims since April 2023.

Incident analysis

chmsbc.org.br was listed by Lockbit5 ransomware, a group with 401 victims recorded in this database. The listing appeared on the group's leak site on December 7, 2025.

chmsbc.org.br is based in Brazil and operates in the Healthcare sector. Brazil ranks #7 worldwide for ransomware disclosures, with 533 victims in this database.

Sector context. Healthcare organisations are high-value ransomware targets because patient data is extremely sensitive, regulatory penalties for breaches are severe, and operational downtime can threaten patient safety — all factors that increase ransom payment pressure.

Lockbit5 typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was chmsbc.org.br attacked by ransomware?

Yes. chmsbc.org.br was listed as a victim of the Lockbit5 ransomware group on December 7, 2025. The organisation is based in Brazil and operates in the Healthcare sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked chmsbc.org.br?

chmsbc.org.br was attacked by Lockbit5 ransomware. Lockbit5 is one of the most active ransomware groups, having claimed 401 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the chmsbc.org.br ransomware attack occur?

The ransomware attack on chmsbc.org.br was disclosed on December 7, 2025. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the chmsbc.org.br ransomware attack?

The specific data stolen from chmsbc.org.br has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Healthcare organisation, chmsbc.org.br likely held patient records, medical data, and personally identifiable information (PII).

How can organisations protect against Lockbit5 attacks?

To defend against Lockbit5 and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.