Disclosure context

About coinbasecartel

CoinbaseCartel is a ransomware group that emerged in September 2025 with financially motivated operations targeting organizations across multiple sectors and geographic regions. The group has demonstrated significant activity in a short timeframe, compromising at least 102 known victims primarily across the United States, United Arab Emirates, Germany, Canada, and Brazil. Their targeting patterns show a preference for technology companies, financial services organizations, manufacturing entities, and consumer services businesses, suggesting an opportunistic approach focused on organizations likely to have both valuable data and the financial resources to pay ransoms. Given the group's recent emergence and limited public documentation from established threat intelligence sources, details regarding their specific attack methodologies, infrastructure, and organizational structure remain largely unconfirmed by major cybersecurity firms or law enforcement agencies. The group appears to maintain active operations as of late 2025, though comprehensive analysis of their tactics, techniques, and procedures awaits further investigation and reporting by established threat intelligence organizations. The group has been linked to 176 public disclosures across our corpus. First observed on a leak site on September 15, 2025; most recent post May 16, 2026. The operation is currently active.

Also tracked as: coinbase cartel.

Timeline of this disclosure

April 15, 2026UOM University listed by coinbasecartelon 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, UOM University is reported in MT.

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

University of Macedonia

listed as UOM University · Claimed by coinbasecartel · listed 1 month ago

35d

Age

since listed · data leaked

Status timeline

Listed
Apr 15, 2026
Data leaked

At a glance

Group: coinbasecartel
Status: Data leaked
Country: MT
Sector: Education
Listed on leak site: Apr 15, 2026

About the victim

AI dossier — public-source company profile

The University of Macedonia (Πανεπιστήμιο Μακεδονίας) is a public higher education institution located in Thessaloniki, Greece. It offers undergraduate and postgraduate programs across schools covering Economics, Business Administration, Information Sciences, and Social and Humanistic Sciences. It is an internationally recognised academic institution serving the educational, cultural, and economic life of Northern Greece.

Industry: Higher Education
Address: 156 Egnatia Street, Thessaloniki 54636, Greece
Employees: 501-1000
Founded: 1948

Attack summary

Severity: high — The disclosure status is 'data_published', indicating confirmed exfiltration from a public university that holds PII of students and staff, academic records, and potentially research data at meaningful scale, though no ransom or specific data volume was stated.

The coinbasecartel group claims to have attacked the University of Macedonia and lists the disclosure status as data_published, indicating data exfiltration has occurred; however, the leak post itself contains no specific details about the nature of the attack, encrypted systems, or the precise data stolen.

high

Data the group says was taken

AI dossier — extracted from the leak post

Student records
Staff/faculty personal data
Academic administrative data
Research data
Financial/procurement records

Original description

AI-summarised, not from the leak post

N/A

The leak post

captured from the group's site

System Breach • Coinbasecartel We are looking for new partners/insiders. Send us a message to dicuss We are looking for new partners/insiders. Send us a message to dicuss CRITICAL ANNOUNCEMENTS &times; Contact Update We have changed our contact method. We now exclusively use qTox Messenger for all communications. SimpleX and Session have been discontinued. Our Tox ID: A7580331D4D16453CCE86D7ADFBCF0CEED0D0D1AEA8F4DBEEBCA9E3B46308F260DE9B41BD838 TO APTIM You may have noticed the sudden, heavy silence. The corporate VPNs are dead. We have been the silent architects of your network for the past three weeks. While your &#34;elite&#34; investigators from Mandiant sat in your logs, we sat directly beside them burning through over a hundred of your corporate identities like disposable tools. we have had your entire network and internal protocols. HOW LONG WILL YOU KEEP YOUR THOUSANDS OF FIELD WORKERS LOCKED OUT? We have successfully exfiltrated the most sensitive engineering data held by any firm in your sectors We hold the complete Navisworks 3D models, P&amp;ID diagrams, and maintenance logic for your major energy plants. This includes the granular Honeywell DCS controller logic. We know…

Sources

Victim sitewww.uom.gr
Leak posthttp://fjg4zi4opkxkvdz7mvwp7h6goe4tcby3hhkrz43pht4j3vakhy75znyd.onion/companies/uom

Source

Indexed 1 month 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.