Cyber Threat Intelligence
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IC
Ransomware Victim Consumer Services

ICO

Ransomware attack by Arcusmedia · Disclosed March 3, 2025 · 🇧🇷 Brazil

ico.com.br

Date Disclosed
Mar 3, 2025
2025
Threat Group
Arcusmedia
109 total victims
Country
🇧🇷 Brazil
Industry
Consumer Services

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 107 victims since May 2024.

Incident Analysis

ICO was targeted by Arcusmedia ransomware, one of the most active ransomware groups in our database with 109 confirmed victims globally. The attack was disclosed on March 3, 2025, when ICO appeared on the group's dark web leak site.

ICO is based in Brazil , operating in the Consumer Services sector. Brazil ranks #7 globally for ransomware attacks, with 447 victims in our database.

Sector context: Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Arcusmedia typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Sep 5, 2026 22:00 UTC.

Frequently Asked Questions

Was ICO attacked by ransomware?

Yes. ICO was listed as a victim of the Arcusmedia ransomware group on March 3, 2025. The organisation is based in Brazil and operates in the Consumer Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked ICO?

ICO was attacked by Arcusmedia ransomware. Arcusmedia is one of the most active ransomware groups, having claimed 109 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the ICO ransomware attack occur?

The ransomware attack on ICO was disclosed on March 3, 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 ICO ransomware attack?

The specific data stolen from ICO 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 Consumer Services organisation, ICO likely held sensitive business data, client information, and operational 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.