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Van Kessel & Janssen

listed as vkj.nl · Claimed by Lockbit5 · listed 5 days ago

4d
Age
since listed · data leaked

Status timeline

  1. ListedAug 31, 2026
  2. Data leakeddate unknown

At a glance

Group
Lockbit5
Status
Data leaked
Country
Netherlands
Listed on leak site
Aug 31, 2026

About the victim

AI dossier — public-source company profile

Van Kessel & Janssen is a mid-sized Dutch construction project management and advisory firm based in Beuningen. They provide services including project management, cost control, and long-term maintenance planning for housing, office, government, industrial, healthcare, and education sector clients across the Netherlands.

Industry
Construction & Project Management Consulting
Address
Beuningen, Gelderland, Netherlands

Attack summary

Severity: medium — Data published status confirmed but no specific proof files, screenshots, or data inventory are advertised in the available leak post excerpt. The company handles project data for multiple sectors and government clients, suggesting moderate sensitivity, but concrete evidence of what was exposed is absent from the provided post.

LockBit5 claims to have compromised Van Kessel & Janssen's systems. The leak post does not explicitly state what data was exfiltrated or whether encryption occurred, though the disclosed status indicates data publication.

medium

What the group claims

Van Kessel & Janssen begeleidt huisvestingsprojecten met deskundig advies en projectmanagement. Van...

Sources

Source

Indexed 5 days 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 lockbit5

Based on the provided data, LockBit5 appears to be a recently emerged ransomware operation first observed in December 2025, representing what may be a new iteration or rebrand within the LockBit ransomware ecosystem, with primary financial motivations evidenced by their targeting of high-value sectors. Given the LockBit naming convention and the timing of emergence, this group likely operates from Eastern Europe or Russia and may represent either a continuation of previous LockBit operations or a new affiliate group leveraging the established LockBit brand, though specific organizational details remain undocumented by major security agencies. While detailed attack methodologies have not been publicly documented by CISA, FBI, or major security researchers, the group's targeting pattern across 157 victims suggests a broad-spectrum approach focusing on technology, manufacturing, healthcare, and transportation sectors primarily in the United States, Brazil, Germany, Italy, and Mexico. Due to the group's recent emergence in December 2025, there are no publicly documented notable campaigns or major incidents reported by established threat intelligence sources, though the victim count indicates active operations. The group appears to be currently active based on the recent first observation date, though comprehensive analysis from major security agencies has not yet been published given the short timeframe since emergence. The group has been linked to 354 public disclosures across our corpus. First observed on a leak site on December 7, 2025; most recent post September 4, 2026. The operation is currently active.

Timeline of this disclosure

  • August 31, 2026vkj.nl listed by lockbit5on the group's public leak site

Other recent disclosures by lockbit5

lockbit5 has been linked to 354 public victims on Darkfield. A sample of the most recent:

See the full lockbit5 dossier →

Sector and geography

Geographically, vkj.nl is reported in Netherlands, a country with 42 ransomware disclosures in our corpus.

If your organisation is affected

A listing by lockbit5 means vkj.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 lockbit5'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.