Was ATG hit by ransomware?

ATG was listed by the coinbasecartel ransomware operation (Sweden), 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 ATG breach?

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

Ransomware victim disclosure

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ATG (Aktiebolaget Trav och Galopp)

listed as ATG · Claimed by Coinbasecartel · listed 7 months ago

43 GB

Data size

Age

since listed · data leaked

Status timeline

ListedDec 12, 2025
Data leakeddate unknown

At a glance

Group: Coinbasecartel
Status: Data leaked
Country: Sweden
Listed on leak site: Dec 12, 2025
Data size: 43 GB

About the victim

AI dossier — public-source company profile

ATG (Aktiebolaget Trav och Galopp) is a Swedish gambling company that operates licensed betting on horse racing, including trotting and galloping. It is owned jointly by the Swedish Trotting Association and the Swedish Jockey Club and holds a dominant position in the Swedish horse racing betting market. The company operates both online and at racetracks across Sweden.

Industry: Horse Racing Betting & Gambling
Address: Hästsportens Hus, Travbanevägen 10, 161 89 Stockholm, Sweden
Employees: 201-500
Founded: 1974

Attack summary

Severity: high — Data has been published ('Leaking' status with new samples added) and 43 GB is referenced in the context of similar victims on the same post. ATG handles regulated gambling operations and likely holds significant customer PII and financial data, making confirmed exfiltration and active publication a high-severity incident.

The coinbasecartel group claims to have exfiltrated data from ATG and lists the victim as 'Leaking' with new samples added, indicating an active and ongoing data publication process. The post references 43 GB of data associated with similarly-staged victims on the same platform.

high

Data the group says was taken

AI dossier — extracted from the leak post

Company internal data
Leaked samples (new samples added)

What the group claims

ATG has since 1974 delivered excitement and entertainment with quality to the Swedish people. The vision is to deliver the world's best gaming expe...

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 siteatg.se
Leak posthttp://fjg4zi4opkxkvdz7mvwp7h6goe4tcby3hhkrz43pht4j3vakhy75znyd.onion/companies/atg

Source

Indexed 7 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.

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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 188 public disclosures across our corpus. First observed on a leak site on September 15, 2025; most recent post July 14, 2026. The operation is currently active.

Also tracked as: coinbase cartel.

Timeline of this disclosure

December 12, 2025ATG listed by coinbasecartelon the group's public leak site

Data size: 43 GB

Other recent disclosures by coinbasecartel

coinbasecartel has been linked to 188 public victims on Darkfield. A sample of the most recent:

See the full coinbasecartel dossier →

Sector and geography

Geographically, ATG is reported in Sweden, a country with 111 ransomware disclosures in our corpus.

If your organisation is affected

A listing by coinbasecartel means ATG 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.
Report the incident to your national CERT, CERT-SE (Sweden), as required for your jurisdiction.
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.