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 98 public disclosures across our corpus. First observed on a leak site on May 15, 2024; most recent post September 17, 2025. The operation is currently inactive.

Also tracked as: arcus media.

Timeline of this disclosure

September 17, 2025Tunad listed by Arcusmediaon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Tunad is reported in Norway, a country with 11 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Tunad

Claimed by Arcusmedia · listed 8 months ago

Age

since listed · data leaked

Status timeline

Listed
Sep 17, 2025
Data leaked

At a glance

Group: Arcusmedia
Status: Data leaked
Country: Norway
Sector: Not Found
Listed on leak site: Sep 17, 2025

About the victim

AI dossier — public-source company profile

Tunad (tunad.io) is a Media Intelligence Platform based in Norway that focuses on enhancing the results of advertising campaigns. The platform appears to provide analytics or intelligence services to advertisers and media buyers. Limited public information is available beyond the domain and brief description referenced in the leak post.

Industry: Media Intelligence & Advertising Technology

Attack summary

Severity: medium — Data has been published by the threat actor, confirming some level of exfiltration, but no specific data types, volume, or regulated/sensitive data categories (e.g. PII at scale, medical, financial) are confirmed from the available evidence. The company operates in adtech/media intelligence, which may involve client and campaign data of moderate sensitivity.

The Arcusmedia ransomware group claims to have attacked Tunad and has published data ('data_published' status), suggesting exfiltration of company data. No specific ransom amount or data volume was stated in the post.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Advertising campaign data
Platform user data
Business intelligence records

What the group claims

Days: 66 Hours: 22 Minutes: 66 Seconds: 99 Tunad.io Tunad is a Media Intelligence Platform that enhances the results of advertising ca…

Sources

Leak posthttp://arcuufpr5xxbbkin4mlidt7itmr6znlppk63jbtkeguuhszmc5g7qdyd.onion/?p=555

Source

Indexed 8 months 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.