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Cyber Threat
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Ransomware victim

AETHOS

Listed by Arcusmedia on · organisation based in Brazil

aethosconsultoria.com.br

Disclosed
Oct 9, 2026
Leak-site listing date
Threat group
Arcusmedia
121 victims listed
Country
Brazil
#7 most targeted
Sector
Not recorded

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.

Arcusmedia listed threat actor AETHOS on its dark web leak site for the first time on 9 October 2026, marking the group's presence in Brazil.

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

AETHOS was listed by Arcusmedia ransomware, a group with 121 victims recorded in this database. The listing appeared on the group's leak site on October 9, 2026.

AETHOS is based in Brazil. Brazil ranks #7 worldwide for ransomware disclosures, with 514 victims in this database.

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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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

Yes. AETHOS was listed as a victim of the Arcusmedia ransomware group on October 9, 2026. The organisation is based in Brazil. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked AETHOS?

AETHOS 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 AETHOS ransomware attack occur?

The ransomware attack on AETHOS was disclosed on October 9, 2026. 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 AETHOS ransomware attack?

The specific data stolen from AETHOS 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. Sensitive business data was likely targeted.

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.