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A New Warning From the Ransomware Underground
Ransomware rarely announces itself with a warning that something is about to go wrong. By the time a company appears on a leak site, attackers may already have spent days or weeks moving through networks, stealing information, and preparing for extortion. That is what makes new victim listings from established ransomware operations so concerning: they can represent only the visible end of a much larger intrusion.
On August 31, 2026, threat-intelligence monitoring attributed two new victim listings to LockBit 5, naming Dutch companies Bartels B.V. and Van Kessel & Janssen (VKJ). The claims were reported by the ThreatMon Threat Intelligence Team through activity observed in the dark web ransomware ecosystem.
At this stage, however, the listings should be treated as ransomware claims rather than independently confirmed breaches. A threat actor adding an organization to a leak site does not, by itself, prove that the attacker successfully compromised the company’s systems, stole data, or encrypted infrastructure.
Two Dutch Companies Named in the Claims
Bartels B.V. Appears on the List
The first organization named in the report is Bartels B.V., operating through bartelsbv.nl. The company describes itself as an established Dutch business specializing in facades and roofing, sustainability-related work, maintenance, service, large-scale projects, complex buildings, renovation, and detailed construction work.
According to the ThreatMon alert, LockBit 5 added Bartels B.V. to its alleged victim list on August 31, 2026.
The timing recorded in the original alert was 13:08:21 UTC+3, equivalent to 10:08:21 UTC.
VKJ Is Also Allegedly Targeted
The second organization named in the same monitoring alert is Van Kessel & Janssen, operating through vkj.nl.
The company focuses on project management and advisory services for construction projects, describing its role around effective project management, clear advice, and practical results.
ThreatMon likewise attributed the listing to LockBit 5 and reported it at the same recorded timestamp.
Why Two Construction Firms Matter
Construction Companies Are Valuable Targets
Construction organizations can hold a surprisingly broad collection of commercially sensitive information. Their systems may contain contracts, architectural documents, project schedules, invoices, employee records, supplier information, customer details, engineering files, and communications with contractors and partners.
A successful intrusion therefore does not necessarily need to stop construction equipment or physically disrupt a building site to cause serious damage.
Project Information Can Be Extremely Sensitive
Large construction projects depend heavily on digital documentation. Plans, bids, budgets, schedules, procurement records, specifications, and change orders may all be stored electronically.
If attackers obtain such information, the consequences can extend beyond the victim itself. Contractors, suppliers, customers, architects, engineers, and other business partners could potentially become part of the incident’s wider impact.
Operational Disruption Can Become Expensive Quickly
Construction companies often coordinate many parties simultaneously. If email, file servers, project-management platforms, accounting systems, or authentication infrastructure become unavailable, work can slow dramatically.
Even when systems are eventually restored, the resulting delays can create contractual disputes, missed deadlines, emergency recovery expenses, and reputational damage.
The Importance of the LockBit 5 Label
The Name Alone Does Not Prove the Intrusion
The most important distinction in this report is the difference between an alleged victim listing and a verified cyberattack.
Threat actors can publish organizations on leak sites for several reasons. A listing may correspond to a genuine compromise, but it can also involve disputed claims, recycled information, exaggerated statements, or attempts to pressure a company into negotiations.
For that reason, the LockBit 5 attribution should currently be described as a claim reported by threat intelligence monitoring, rather than established fact.
Dark Web Listings Are Part of the Extortion Strategy
Modern ransomware groups increasingly treat the leak site as part of the attack itself.
The threat is straightforward: if the victim refuses to cooperate, stolen information may eventually be published or sold.
That pressure can be particularly powerful for organizations whose data includes customer records, financial documents, contracts, or proprietary business information.
The Double-Extortion Problem
Encryption Is Only One Part of the Threat
Traditional ransomware focused primarily on encrypting files and demanding payment for decryption.
Modern operations can use a much broader model. Attackers may first steal sensitive information and then encrypt systems. Even if the victim has reliable backups, the criminals can still threaten to release the stolen information.
This is commonly described as double extortion.
Backups Do Not Automatically Solve the Problem
A company with good backups may be able to recover its files without purchasing a decryptor.
But backups do not necessarily prevent the publication of stolen data.
That means organizations need two different defensive strategies: one for availability and recovery, and another for data confidentiality and exfiltration prevention.
Why Threat Intelligence Monitoring Matters
Early Visibility Can Buy Valuable Time
Threat intelligence services can sometimes identify ransomware claims before an organization publicly acknowledges an incident.
That information can give security teams an opportunity to investigate authentication logs, endpoint telemetry, network traffic, privileged accounts, and unusual data transfers.
The earlier a potential compromise is investigated, the greater the chance of identifying the intrusion before additional systems are affected.
A Listing Should Trigger an Investigation
A victim listing should not automatically be dismissed as false simply because it has not been independently verified.
Organizations named in ransomware intelligence should investigate immediately.
Security teams should determine whether there are signs of unauthorized access, credential theft, persistence, lateral movement, privilege escalation, or large-scale data transfers.
What Businesses Should Watch For
Suspicious Account Activity
Unexpected authentication from unfamiliar locations, unusual login times, newly created accounts, or sudden privilege changes can provide clues that attackers have gained access.
Unusual File Transfers
Large outbound transfers involving sensitive documents deserve particular attention, especially when they originate from servers or employee devices that normally do not transmit significant quantities of data externally.
Unexpected Administrative Activity
Attackers frequently seek elevated privileges because administrative access can make lateral movement and data collection significantly easier.
New administrator accounts, changes to security policies, or suspicious remote-management activity should therefore receive immediate scrutiny.
Unusual Endpoint Behavior
Security teams should investigate unexpected scripting, credential-dumping indicators, remote-access tools, disabled security controls, or suspicious processes appearing across multiple endpoints.
Deep Analysis: Commands Security Teams Should Consider
Command 1 — Review Recent Authentication Events
Security teams should search identity-provider and Windows authentication logs for unusual successful and failed login patterns.
Useful investigation concepts include:
4624 — successful Windows logon
4625 — failed Windows logon
4672 — special privileges assigned to a new logon
4720 — user account created
4728/4732 — membership changes involving privileged groups
These events should be correlated with source IP addresses, devices, usernames, timestamps, and normal user behavior.
Command 2 — Hunt for Suspicious PowerShell Activity
PowerShell can be used legitimately by administrators, but attackers frequently abuse it after obtaining access.
Security teams can search for suspicious combinations involving encoded commands, download activity, hidden execution, unusual parent processes, and remote execution.
Example defensive hunting concept:
powershell.exe -EncodedCommand
The appearance of encoded PowerShell alone is not proof of malicious activity, but it can be a useful investigation signal.
Command 3 — Search for Unusual Outbound Connections
Network defenders should identify endpoints communicating with unfamiliar external infrastructure, particularly immediately before or after suspicious authentication events.
Look for unusual destinations, rare domains, abnormal ports, and significant increases in outbound traffic.
Command 4 — Examine Privileged Group Changes
Investigators should review recent additions to administrative groups.
A newly created privileged account or an unexpected user added to an administrative group can indicate privilege escalation or persistence.
Command 5 — Check Backup Infrastructure
Backup servers should be investigated separately from ordinary endpoints.
Attackers commonly understand that backups represent the
Security teams should verify that backup repositories remain accessible, intact, and isolated from compromised credentials.
Command 6 — Search for Data Staging
Large collections of files appearing in unusual temporary directories can indicate that an attacker is preparing information for exfiltration.
Investigators should correlate file creation, compression utilities, network activity, and account behavior.
Command 7 — Examine Remote Administration
Unexpected use of remote-management tools should receive additional scrutiny.
Tools used legitimately by IT departments can also be abused by attackers because their presence may appear normal.
The key question is not simply whether a tool exists, but who used it, from where, when, and for what purpose.
Command 8 — Preserve Evidence Before Cleanup
Organizations should avoid immediately wiping suspicious machines before collecting forensic evidence.
Memory captures, disk images, endpoint telemetry, authentication records, firewall logs, and cloud audit information may reveal how attackers entered and what they accessed.
Destroying evidence too early can make the investigation substantially harder.
The Bigger Ransomware Picture
Ransomware Is Becoming an Ecosystem
The modern ransomware economy is no longer simply about one group breaking into one company.
It can involve initial-access brokers, credential thieves, malware developers, affiliates, data brokers, infrastructure providers, and extortion operators.
That specialization allows criminal groups to move quickly and attack organizations that may have never been directly exposed to the original malware campaign.
The Construction Sector Should Not Be Considered Low Risk
Construction businesses sometimes operate with a mixture of corporate IT, cloud applications, subcontractor access, remote workers, specialized software, and external vendors.
Every connection creates another potential avenue for attackers.
A smaller organization can therefore become attractive not because it is globally famous, but because its defenses may be perceived as weaker than those of a major enterprise.
What Undercode Say:
The Most Important Word Is “Claims”
The central issue in this report is credibility. At the time of publication, the available information establishes that ThreatMon reported LockBit 5 listings naming Bartels B.V. and Van Kessel & Janssen. It does not independently establish that the two companies were successfully breached.
Ransomware Groups Have an Incentive to Create Pressure
Threat actors benefit from making their claims visible. Public victim listings can pressure companies, attract attention, and potentially encourage negotiations.
That means every listing should be investigated seriously while still being described cautiously.
Two Listings at Once Increase Attention
The appearance of two Dutch construction-related organizations in the same monitoring alert is notable.
It could represent coordinated targeting, opportunistic victim selection, or simply two unrelated claims appearing at approximately the same time.
There is currently insufficient evidence to establish a connection between the two alleged incidents.
Construction Data Has Real Extortion Value
Project contracts, architectural documents, invoices, customer information, and supplier records can have significant commercial value.
Even information that appears ordinary in isolation can become damaging when aggregated.
The Real Risk May Be Data Theft
If the claims are eventually verified, the most consequential question may not be whether files were encrypted.
Investigators will need to determine what information was accessed and whether it left the organization.
Backups Remain Essential
Reliable offline or otherwise protected backups remain one of the most important defenses against destructive ransomware.
However, backups must be combined with strong identity security and data-loss controls.
Identity Has Become the New Perimeter
Strong passwords alone are no longer sufficient.
Organizations should prioritize phishing-resistant multifactor authentication, privileged-access management, conditional access, and rapid detection of abnormal account behavior.
Vendor Access Requires Attention
Construction businesses frequently work with external partners.
Third-party credentials and remote access should therefore be monitored carefully, particularly accounts that can access shared documents or internal systems.
Security Monitoring Should Extend Beyond Endpoints
Endpoint detection is important, but ransomware investigations frequently require evidence from identity systems, cloud platforms, firewalls, VPNs, email systems, and file servers.
A fragmented logging strategy can leave investigators with major blind spots.
The First Hours Matter
If either company confirms a compromise, the initial response will be critical.
Organizations should isolate affected systems, protect backups, revoke compromised credentials, preserve forensic evidence, and determine whether attackers remain inside the environment.
Communication Can Become a Security Control
Employees need clear instructions during an incident.
Confusion can cause people to reconnect compromised devices, reset systems incorrectly, or destroy evidence.
Public Claims Can Move Faster Than Facts
Ransomware groups can publish allegations within minutes.
Corporate investigations may take days or weeks.
That difference in speed creates an environment where speculation can spread before investigators have completed their work.
Independent Verification Is Essential
A responsible assessment should distinguish between threat intelligence observations, company statements, forensic evidence, and confirmed regulatory disclosures.
Each represents a different level of certainty.
LockBit 5 Should Be Monitored Closely
If the LockBit 5 attribution proves accurate, additional activity surrounding the two organizations could provide clues about the campaign.
Security teams should monitor relevant threat intelligence for new postings, data samples, infrastructure indicators, or further victim claims.
Data Samples Could Change the Assessment
If attackers eventually publish sample files or verifiable information allegedly taken from either organization, researchers could gain stronger evidence that the compromise occurred.
Until then, the claims remain unconfirmed.
The Absence of Public Confirmation Means Little
Companies do not necessarily disclose cyber incidents immediately.
Legal reviews, forensic investigations, insurance requirements, regulatory obligations, and negotiations can all affect the timing of public statements.
Silence Is Not Proof of Safety
At the same time, silence should not be interpreted as confirmation of compromise.
The absence of a company statement simply means that publicly available information remains incomplete.
Ransomware Prevention Requires Layered Security
There is no single control capable of stopping every ransomware campaign.
Effective defense combines identity protection, patching, endpoint detection, segmentation, backups, email security, logging, threat intelligence, and employee awareness.
Recovery Planning Should Be Tested
A backup strategy that has never been tested is an assumption, not a recovery plan.
Organizations should regularly perform restoration exercises and confirm that critical systems can actually be rebuilt.
Privileged Accounts Deserve Special Protection
Administrative credentials can provide attackers with disproportionate power.
They should be minimized, monitored, protected with strong authentication, and separated from ordinary user accounts.
Network Segmentation Can Limit Damage
If an attacker compromises one workstation, segmentation can prevent easy movement into servers, backup environments, and critical applications.
This can transform a potentially catastrophic compromise into a contained incident.
Encryption Is Not the Only Indicator
Security teams should not wait for ransom notes or encrypted files.
Credential abuse, unusual administrative activity, data staging, and suspicious outbound traffic can appear much earlier.
Threat Intelligence Is Most Valuable When Actionable
Knowing that a company appears on a ransomware list is useful.
Knowing which accounts, domains, IP addresses, malware indicators, or behaviors are associated with the intrusion is far more useful.
Companies Should Prepare Before a Claim Appears
Incident-response plans should already identify who has authority to isolate systems, contact forensic specialists, communicate with customers, and coordinate with legal and regulatory teams.
Waiting until ransomware appears can cost valuable time.
The Human Element Remains Important
Phishing, credential theft, social engineering, and malicious attachments continue to provide attackers with practical routes into organizations.
Technology alone cannot eliminate these risks.
Small and Medium Businesses Need Enterprise-Level Discipline
An organization does not need thousands of employees to require serious cybersecurity.
A single compromised administrator account can potentially expose an entire business.
The Supply Chain Creates Additional Exposure
Construction projects involve many organizations.
A compromise affecting one supplier, contractor, consultant, or technology provider can potentially create consequences for others.
Ransomware Risk Is Also a Business Risk
The cost of ransomware is not limited to cybersecurity.
Downtime, contractual penalties, lost productivity, legal expenses, customer notification, forensic investigations, and reputational damage can all become part of the final bill.
The Most Important Defensive Question
Organizations should regularly ask a simple question:
If an attacker obtained one
The answer can reveal weaknesses that conventional vulnerability scans may not identify.
Verification Should Continue
For Bartels B.V. and Van Kessel & Janssen, the next important development will be independent confirmation or denial of the allegations.
Until additional evidence emerges, the most accurate description remains that LockBit 5 allegedly listed the two Dutch companies as victims.
The Lesson Extends Beyond These Companies
Whether the claims ultimately prove accurate or not, the incident highlights a broader reality: ransomware groups can target businesses that may not appear to be obvious high-profile targets.
Organizations holding valuable operational and commercial data can become attractive simply because that data can be used as leverage.
Preparedness Is Still the Best Advantage
The strongest position is reached before an attacker gains access.
MFA, least privilege, segmented networks, secure backups, endpoint monitoring, centralized logging, tested incident-response procedures, and employee awareness can dramatically improve an organization’s ability to withstand ransomware.
❌ The ransomware attack itself is not independently confirmed by the supplied information. The available material reports threat-intelligence monitoring of LockBit 5 victim listings, but does not provide forensic evidence proving that either company was compromised.
✅ ThreatMon is identified as the source of the ransomware activity report. The supplied post explicitly attributes the detection to the ThreatMon Threat Intelligence Team.
✅ Bartels B.V. and Van Kessel & Janssen are the two organizations named in the supplied claims. Both appear in the provided material as alleged LockBit 5 victims on August 31, 2026.
❌ There is not enough evidence to conclude that data was stolen, encrypted, or leaked. A ransomware-group victim listing alone does not establish the specific nature or success of an intrusion.
Prediction
(-1) If the LockBit 5 claims are confirmed, both organizations could face significant operational and reputational pressure, particularly if sensitive project, customer, financial, or contractual information was accessed.
(-1) The situation could become more serious if stolen data is later published. A confirmed data leak would increase potential consequences beyond ordinary system disruption.
(+1) If the listings are inaccurate or cannot be substantiated, the immediate risk to the two organizations may be substantially lower than the claims suggest.
(+1) If the companies already have strong segmentation, protected backups, multifactor authentication, and mature incident-response capabilities, any confirmed intrusion could potentially be contained before becoming a major operational crisis.
(+1) The fastest route to clarity will be independent verification. Company statements, forensic findings, published evidence, or credible samples of allegedly stolen data would significantly strengthen or weaken the current claims.
Final Assessment
The August 31 listings are a reminder that ransomware intelligence must be read carefully. LockBit 5 has reportedly claimed Bartels B.V. and Van Kessel & Janssen as victims, but the supplied evidence does not independently confirm successful compromise.
For defenders, however, the correct response to an alleged ransomware listing is not to wait for certainty. It is to investigate immediately, preserve evidence, review identity and network activity, protect backups, and determine whether sensitive information has actually been accessed or removed.
In ransomware defense, the difference between an allegation and a confirmed breach matters—but so does the speed at which an organization responds to the allegation.
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