Arcusmedia
Since May 15, 2024, Arcusmedia has listed 121 organizations on its leak site.
Listings per month
- Total listings
- 121
- First listing
- May 15, 2024
- Latest listing
- Oct 9, 2026
- MITRE ATT&CK techniques
- 0
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.
It posted 23 listings in the last 12 months; the busiest month was July 2026 (9 listings).
Most targeted country: Brazil, with 24 listings (20% of the total).
Most targeted sector: Professional Services, with 28 listings (23% of the total).
Targeted countries
Showing 10 of 121 results
What does a ransomware group do?
Ransomware groups break into corporate networks, move data out and encrypt systems. If the ransom is not paid, they list the organization on a leak site and threaten to publish the data.
What should you do if your organization is listed on a leak site?
- Record the listing and any published sample files; do not visit the leak site from the corporate network.
- Isolate affected systems and preserve logs without deleting them.
- Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
- Make any decision about the ransom demand together with legal, management and incident response.
- Do not bring systems back online before the attacker’s entry point is closed.
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