Was AETHOS hit by ransomware?

AETHOS was listed by the Arcusmedia ransomware operation (Brazil), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Arcusmedia ransomware group?

Arcusmedia is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the AETHOS breach?

Arcusmedia published data attributed to AETHOS. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Aethos Sistemas

listed as AETHOS · Claimed by Arcusmedia · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedOct 9, 2026
Data leakeddate unknown

At a glance

Group: Arcusmedia
Status: Data leaked
Country: Brazil
Listed on leak site: Oct 9, 2026

About the victim

AI dossier — public-source company profile

Aethos Sistemas is a Brazilian software company providing enterprise solutions including ERP, CRM, and cloud services. Operating for over 20 years, they serve approximately 800+ companies across distribution, gastronomy, transportation, and retail sectors with tools for inventory control, sales management, and financial oversight.

Industry: Business Management Software & ERP Solutions

Attack summary

Severity: medium — Confirmed data exfiltration announced by ransomware group with published disclosure timeline, but no proof files, specific data inventory details, or operational disruption reported in the leak post.

The arcusmedia group claims to have exfiltrated data from Aethos Sistemas and announced a 5-day sell window and 7-day leak deadline. No specific details on data categories or operational impact are provided in the leak post.

medium

What the group claims

Aethos Sistemas offers a comprehensive suite of software solutions designed to streamline Deadline: 2026-10-16 12:44:00.000000

The leak post

captured from the group's site

* 

###### Aethos Sistemas offers a comprehensive suite of software solutions designed to streamline business management, including ERP, CRM, and cloud services. Their products cater to various sectors such as distribution, gastronomy, transportation, and retail, providing tools for inventory control, sales management, and financial oversight. The company focuses on delivering real-time data and automation t o enhance decision-making and operational efficiency for its clients. With over 800 companies served and more than 20 years of experience, Aethos is committed to supporting businesses in their growth and modernization efforts.EST SELL : 5 DaysEST LEAK : 7 Days

Screenshot of the leak post

Sources

Victim siteaethosconsultoria.com.br
Leak posthttp://arcuufpr5xxbbkin4mlidt7itmr6znlppk63jbtkeguuhszmc5g7qdyd.onion/?p=831

Source

Indexed 5 hours ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Arcusmedia

Arcusmedia is a relatively new ransomware group that emerged in May 2024, operating with apparent financial motivations based on their targeting patterns across multiple countries and sectors. The group's origin and potential state affiliations remain unclear given limited public documentation from established threat intelligence sources, though their targeting of victims across Brazil, the United States, Spain, UAE, and Mexico suggests either a geographically distributed operation or deliberate international scope. With 98 documented victims in a short operational timeframe, Arcusmedia has demonstrated notable activity levels, primarily focusing on technology, business services, agriculture and food production, and transportation/logistics sectors, though their targeting appears opportunistic rather than strategically focused given the "Not Found" classification as their primary sector target. Limited public reporting from major cybersecurity firms and law enforcement agencies means specific details about their attack methodologies, initial access vectors, encryption techniques, or whether they employ double extortion tactics remain undocumented in authoritative sources. No major campaigns, high-profile victims, or significant law enforcement actions against Arcusmedia have been publicly reported by CISA, FBI, or established threat intelligence organizations. Current operational status appears active based on the recent emergence timeframe, though comprehensive threat intelligence profiles from reputable sources have not yet been published given the group's recent appearance in the threat landscape. The group has been linked to 118 public disclosures across our corpus. First observed on a leak site on May 15, 2024; most recent post October 9, 2026. The operation is currently inactive.

Also tracked as: arcus media.

Timeline of this disclosure

October 9, 2026AETHOS listed by Arcusmedia on the group's public leak site

Other recent disclosures by Arcusmedia

Arcusmedia has been linked to 118 public victims on Darkfield. A sample of the most recent:

See the full Arcusmedia dossier →

Sector and geography

Geographically, AETHOS is reported in Brazil, a country with 209 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Arcusmedia means AETHOS appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CERT.br (Brazil), as required for your jurisdiction.
Monitor for the data appearing on Arcusmedia's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.