Was Kooijman Vianen (kooijmanvianen.nl) hit by ransomware?

Kooijman Vianen (kooijmanvianen.nl) was listed by the Fog ransomware operation (Netherlands), 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 Fog ransomware group?

Fog 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 Kooijman Vianen (kooijmanvianen.nl) breach?

Fog published data attributed to Kooijman Vianen (kooijmanvianen.nl) (~25.7 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Kooijman Vianen

listed as Kooijman Vianen (kooijmanvianen.nl) · Claimed by Fog · listed 1 year ago

25.7 GB

Data size

17m

Age

since listed · data leaked

Status timeline

ListedJan 23, 2025
Data leakeddate unknown

At a glance

Group: Fog
Status: Data leaked
Country: Netherlands
Sector: Transportation/Logistics
Listed on leak site: Jan 23, 2025
Data size: 25.7 GB

About the victim

AI dossier — public-source company profile

Kooijman Vianen is a Dutch transportation and logistics company operating under the domain kooijmanvianen.nl. Beyond the domain name, no public company details are available.

Industry: Transportation & Logistics

Attack summary

Severity: medium — Data exfiltration of 25.7 GB is confirmed by publication, but the post provides no proof files, screenshots, or specific data inventory. No operational impact is stated. The transportation/logistics sector may hold sensitive operational or customer information, but without detail on what was taken, assessment is constrained to the volume alone.

The Fog ransomware group claims to have exfiltrated 25.7 GB of data from Kooijman Vianen. The specific nature of encrypted systems and the content of the exfiltrated data are not detailed in the available post.

medium

What the group claims

25.7 GB

Sources

Victim sitekooijmanvianen.nl
Leak posthttp://xbkv2qey6u3gd3qxcojynrt4h5sgrhkar6whuo74wo63hijnn677jnyd.onion/posts/6792584fc2ca92c59469507a/

Source

Indexed 1 year 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 Fog

Fog is a relatively new ransomware group that emerged in July 2024, operating with apparent financial motivations and demonstrating rapid expansion in their victim targeting across multiple geographic regions and industry sectors. The group's origin and specific affiliations remain unclear due to their recent emergence, though their operational patterns suggest they likely operate independently rather than as part of an established Ransomware-as-a-Service ecosystem. Given the limited public documentation from major security agencies and researchers due to the group's recent appearance, specific details about their attack methodology, initial access vectors, and encryption techniques have not yet been comprehensively analyzed or reported by authoritative sources such as CISA, FBI, or major threat intelligence firms. The group has reportedly victimized 189 organizations primarily across the United States, Germany, France, Australia, and Brazil, with their attacks predominantly targeting the technology sector, followed by education, business services, and manufacturing industries, though no specific high-profile campaigns or record ransom demands have been publicly documented by major security researchers at this time. As of current reporting, Fog appears to remain active given their recent emergence and ongoing victim acquisition patterns observed throughout 2024. The group has been linked to 189 public disclosures across our corpus. First observed on a leak site on July 16, 2024; most recent post March 20, 2025. The operation is currently inactive.

Timeline of this disclosure

January 23, 2025Kooijman Vianen (kooijmanvianen.nl) listed by Fogon the group's public leak site

Data size: 25.7 GB

Other recent disclosures by Fog

Fog has been linked to 189 public victims on Darkfield. A sample of the most recent:

See the full Fog dossier →

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 1,081 disclosures indexed across all operators we track. Geographically, Kooijman Vianen (kooijmanvianen.nl) is reported in Netherlands, a country with 150 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Fog means Kooijman Vianen (kooijmanvianen.nl) 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, NCSC-NL (Netherlands), as required for your jurisdiction.
Monitor for the data appearing on Fog'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.