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Cyber Threat
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Ransomware victim Education

Colégio Nova Dimensão

Listed by Arcusmedia on · organisation based in Brazil

colegiond.com.br/

Disclosed
May 18, 2024
Leak-site listing date
Threat group
Arcusmedia
121 victims listed
Country
Brazil
#7 most targeted
Sector
Education

ThreatAI analysis

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

About the Arcusmedia group

Arcus Media is a ransomware-as-a-service group that emerged in May 2024, employing double extortion with ChaCha20 + RSA-2048 encryption and recruiting affiliates via a referral-based vetting process, claiming 50+ victims across manufacturing, healthcare, retail, and business services globally. Arcusmedia has listed 115 victims since May 2024.

Incident analysis

Colégio Nova Dimensão was listed by Arcusmedia ransomware, a group with 121 victims recorded in this database. The listing appeared on the group's leak site on May 18, 2024.

Colégio Nova Dimensão is based in Brazil and operates in the Education sector. Brazil ranks #7 worldwide for ransomware disclosures, with 532 victims in this database.

Sector context. Educational institutions often have under-resourced IT security teams and hold large amounts of student and faculty personal data, making them attractive targets for ransomware groups.

Arcusmedia 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 Colégio Nova Dimensão attacked by ransomware?

Yes. Colégio Nova Dimensão was listed as a victim of the Arcusmedia ransomware group on May 18, 2024. The organisation is based in Brazil and operates in the Education sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Colégio Nova Dimensão?

Colégio Nova Dimensão was attacked by Arcusmedia ransomware. Arcusmedia is one of the most active ransomware groups, having claimed 121 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Colégio Nova Dimensão ransomware attack occur?

The ransomware attack on Colégio Nova Dimensão was disclosed on May 18, 2024. 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 Colégio Nova Dimensão ransomware attack?

The specific data stolen from Colégio Nova Dimensão 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 Education organisation, Colégio Nova Dimensão likely held student and faculty personal data and academic records.

How can organisations protect against Arcusmedia attacks?

To defend against Arcusmedia 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.