Was Efficy - 43gb leaked hit by ransomware?

Efficy - 43gb leaked was listed by the coinbasecartel ransomware operation (Belgium), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the coinbasecartel ransomware group?

coinbasecartel is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Efficy - 43gb leaked breach?

coinbasecartel published data attributed to Efficy - 43gb leaked (~43 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Efficy - 43gb leaked

Claimed by Coinbasecartel · listed 2 months ago

43 GB

Data size

Age

since listed · data leaked

Status timeline

ListedMar 30, 2026
Data leakeddate unknown

At a glance

Group: Coinbasecartel
Status: Data leaked
Country: Belgium
Sector: Technology
Listed on leak site: Mar 30, 2026
Data size: 43 GB

About the victim

AI dossier — public-source company profile

Efficy is a European CRM software provider headquartered in Belgium, serving approximately 13,000 companies across Europe with more than 25 years of CRM expertise. The company offers an all-in-one platform covering sales, marketing, and customer service, with AI-driven features, European data sovereignty, and on-premise or cloud deployment options. It provides tailored CRM solutions to industries including financial services, law firms, construction, and IT & telecoms.

Industry: CRM Software & Business Services
Employees: 201-500
Founded: 1999

Attack summary

Severity: high — 43 GB of data is confirmed exfiltrated and published by the threat actor. As a CRM platform serving 13,000 European companies, Efficy likely holds significant volumes of customer business data, contact records, and potentially regulated PII across its client base, constituting significant business and third-party data exposure.

The coinbasecartel group claims to have exfiltrated 43 GB of data from Efficy and has published it, listing the victim status as 'Leaked' on their dashboard. No ransom amount was stated and the specific categories of exfiltrated data are not detailed in the post beyond the volume figure.

high

Data the group says was taken

AI dossier — extracted from the leak post

43 GB of company data (unspecified categories)
Potentially customer/CRM data
Potentially internal business documents

Original description

AI-summarised, not from the leak post

Efficy is a Belgian company that specializes in developing CRM (Customer Relationship Management) software solutions for businesses to improve customer service and streamline sales processes. They offer tools for managing contacts, sales, customer support, etc. However, the term "43gb leaked" seems to reference a cyber attack or data breach incident, implying there could have been a significant leak of data from the company.

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 siteefficy.com
Leak posthttp://fjg4zi4opkxkvdz7mvwp7h6goe4tcby3hhkrz43pht4j3vakhy75znyd.onion/companies/efficy

Source

Indexed 2 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

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 187 public disclosures across our corpus. First observed on a leak site on September 15, 2025; most recent post June 10, 2026. The operation is currently active.

Also tracked as: coinbase cartel.

Timeline of this disclosure

March 30, 2026Efficy - 43gb leaked listed by coinbasecartelon the group's public leak site

Data size: 43 GB

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 2,526 disclosures indexed across all operators we track. Geographically, Efficy - 43gb leaked is reported in Belgium, a country with 28 ransomware disclosures in our corpus.

If your organisation is affected

A listing by coinbasecartel means Efficy - 43gb leaked appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Monitor for the data appearing on coinbasecartel's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.