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

July 27, 2025College stjb listed by Arcusmediaon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 694 disclosures indexed across all operators we track. Geographically, College stjb is reported in France, a country with 472 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

Collège Saint Jean-Baptiste de La Salle

listed as College stjb · Claimed by Arcusmedia · listed 10 months ago

Age

since listed · data leaked

Status timeline

Listed
Jul 27, 2025
Data leaked

At a glance

Group: Arcusmedia
Status: Data leaked
Country: France
Sector: Education
Listed on leak site: Jul 27, 2025

About the victim

AI dossier — public-source company profile

Collège Saint Jean-Baptiste de La Salle is a Catholic secondary school in France, as indicated by the domain stjb-delasalle.fr and the group's post referencing it as a Catholic establishment.

Industry: Education – Secondary School

Attack summary

Severity: medium — Data has been published (disclosed status: data_published) from an educational institution, which typically holds PII of minors and staff, but without detail on the volume, specificity, or operational disruption, confidence remains moderate.

Arcusmedia claims to have compromised the school and published data. The specific data exfiltrated and operational impact are not detailed in the available post excerpt.

medium

Data the group says was taken

AI dossier — extracted from the leak post

School records
Student/personnel information

What the group claims

Days06Hours23Minutes22226666Seconds22229999 stjb-delasalle.frThe Collège Saint Jean-Baptiste de La Salle is a Catholic establishment b…

Sources

Leak posthttp://arcuufpr5xxbbkin4mlidt7itmr6znlppk63jbtkeguuhszmc5g7qdyd.onion/?p=533

Source

Indexed 10 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.