Dutch Authorities Arrest Cybercriminal Linked to ShinyHunters: Group Targets FBI and Cl0p
Dutch authorities have arrested a 24-year-old previously convicted cybercriminal, Pepijn van der Stap, known by the alias "Umbreon". The arrest is linked to his alleged involvement with ShinyHunters, a group responsible for large-scale data theft and extortion. In response, the remaining members of the collective have intensified their activities, hacking the FBI's recruitment site and extorting the Russian ransomware gang Cl0p.
Quick Response
Pepijn van der Stap, alias "Umbreon", has been arrested in the Netherlands for his alleged involvement with ShinyHunters. The group recently hacked the FBI's website and extorted the ransomware gang Cl0p. ShinyHunters exploited a vulnerability in Oracle PeopleSoft (CVE-2026-35273) for their attacks.
The Dual Life of Van der Stap
Van der Stap, convicted in 2023 for data theft and extortion that earned him between 1.5 and 2.7 million euros, led a double life. By day, he worked as a software engineer for Hadrian, an Amsterdam cybersecurity startup, and collaborated with the Dutch Institute for Vulnerability Disclosure (DIVD). By night, he operated as a hacker under the alias "Umbreon", publishing stolen data on forums like RaidForums and Breached. In 2023, he was sentenced to four years in prison, one of which was suspended, for his crimes.
The Arrest and ShinyHunters' Reaction
Arrested around September 16, 2026, Van der Stap is currently in pre-trial detention. Dutch authorities are trying to identify the voice of a ShinyHunters member in a phone recording related to the breach of Odido, the largest mobile telecommunications service provider in the Netherlands. In that breach, ShinyHunters stole data on over 6.2 million people.
In response to the arrest, ShinyHunters published a statement claiming to support their arrested member and harshly criticizing the Dutch police, calling them "incompetent" and "useless". The group also threatened further large-scale attacks.
The Attack on the FBI and the Oracle PeopleSoft Vulnerability
Just a few days after Van der Stap's arrest, ShinyHunters claimed responsibility for an attack on the FBI's recruitment site, apply.fbijobs.gov. The stolen data includes Social Security numbers and personal information on over 5,000 FBI officials, including sensitive medical and psychiatric files.
The group exploited a recently patched vulnerability in Oracle PeopleSoft (CVE-2026-35273), a widely used software-as-a-service platform for human resource management. Oracle released a patch for the vulnerability, but ShinyHunters used a URL encoding trick to bypass the web firewall rules suggested by Mandiant to mitigate the threat.
The Evolution of ShinyHunters Under Rey's Leadership
Sources close to the investigation state that ShinyHunters' recent bold actions against the FBI and Cl0p represent a significant shift in the group's behavior. This change is attributed to the rise of Rey, a teenage cybercriminal from Amman, Jordan, who now leads the collective. Rey is known for his conflicts with Van der Stap over control of the ShinyHunters brand and its data.
The presence of the ASCII image of the Pokémon Umbreon in the defacing message of the FBI site is seen as an attempt by Rey to blame Van der Stap for the attack. Rey was previously identified by the cybersecurity firm KELA in March 2025.
Van der Stap's Transition to Cybersecurity
After his conviction, Van der Stap claimed to want to reform and contribute positively to society. He worked as an offensive security manager for Neo Security, a Dutch company. However, it is unclear whether his transition was completed, given that he was arrested shortly after an interview in which he claimed to want to compensate his victims.
Implications for Corporate Cybersecurity
ShinyHunters' attacks highlight the importance of robust ransomware protection and an effective incident response. Companies using Oracle PeopleSoft should ensure they apply the latest patches and implement Security Information and Event Management solutions to detect and quickly respond to any breaches.
ShinyHunters' attacks against the FBI and Cl0p also underscore the need for rigorous identity management and a zero trust architecture to protect sensitive data. Organizations should consider implementing Data Loss Prevention solutions to prevent the loss of critical information.
The Impact on the Cybercriminal Ecosystem
The arrest of Van der Stap and ShinyHunters' recent actions are reshaping the dynamics of the underground cybercriminal world. The tension between Van der Stap and Rey has created fragmentation within the group, which now has to deal with unstable leadership and internal conflicts. This scenario offers an opportunity for other criminal actors to infiltrate or take advantage of the organizational chaos.
Analysts at KELA have observed a 40% increase in activity on forums dedicated to the sale of stolen data, with many actors seeking to acquire sensitive information related to recent attacks. The situation resembles the chaos that followed the fall of REvil, when several groups attempted to fill the void left by the ransomware gang.
Implications for NIS2 and DORA Compliance
ShinyHunters' attacks against government institutions and critical service providers raise important questions regarding NIS2 compliance and the DORA regulation. Both frameworks require robust measures of cloud security and incident response, but recent attacks demonstrate that even well-prepared organizations can be vulnerable.
Legal experts suggest that the FBI may face internal investigations to determine if it has met the security requirements set by the legislation. Furthermore, the case could accelerate the adoption of stricter standards for managing sensitive data, with a significant impact on the market for cyber insurance and MDR services.
The Future of ShinyHunters and Next Moves
With Rey in command, ShinyHunters seems to have adopted a more aggressive strategy, targeting high-profile objectives to maximize media impact and potential extortions. However, the lack of internal cohesion and pressure from authorities could lead to the group's decline or reorganization.
Sources close to the cybercrime world suggest that other actors, including groups affiliated with Conti and LockBit, may seek to ally with ShinyHunters or acquire its most qualified members. This scenario would further complicate investigations by authorities and require greater international cooperation.
The Challenges for Victims and Remediation Options
Victims of ShinyHunters' attacks, including the FBI and Odido, face significant challenges in managing the consequences. The theft of sensitive data, including Social Security numbers and medical information, requires a rapid incident response and the implementation of advanced Data Loss Prevention measures.
For affected organizations, the immediate priority is to notify the competent authorities and provide support to those affected, including offering credit monitoring services and legal assistance. Additionally, assessing existing vulnerabilities and updating security infrastructures are crucial steps to prevent future attacks.
Prospects for Corporate Cybersecurity
The ShinyHunters case underscores the importance of rigorous identity management and a zero trust approach to protect sensitive data. Companies using platforms like Oracle PeopleSoft must ensure that all security patches are applied promptly and that Security Information and Event Management solutions are implemented to detect and quickly respond to any breaches.
Furthermore, collaboration with SOC as a Service providers and the adoption of MDR services can offer an additional level of protection, allowing organizations to benefit from specialized skills and a more effective incident response.
Lessons Learned and Preventive Measures
ShinyHunters' attacks offer valuable lessons for the cybersecurity sector. First, the need for continuous vulnerability assessment is evident, as even recent patches can be bypassed with advanced techniques. Second, staff training and threat awareness are fundamental to preventing social engineering attacks.
Finally, the importance of a robust disaster recovery strategy cannot be underestimated. Organizations must ensure that critical data is protected and that recovery plans are in place to minimize the impact of any breaches.
The Role of Cyber Insurance
The ShinyHunters case highlights the importance of an adequate cyber risk policy. Cyber insurance can provide coverage for the costs related to security incidents, including reimbursements for victims, forensic investigations, and legal expenses. Additionally, many policies include incident response services and support in crisis management.
However, it is essential that organizations understand the terms and conditions of their policies, ensuring that they cover all specific risks they are exposed to. Negotiating customized clauses and regularly reviewing coverage are crucial steps to ensure adequate protection.
Conclusions and Future Predictions
The cybercrime landscape is constantly evolving, with groups like ShinyHunters adopting increasingly bold and sophisticated strategies. The collective's recent actions suggest that attacks against government institutions and critical service providers will become more frequent, requiring a coordinated and proactive response from authorities and organizations.
It is expected that the adoption of advanced cloud security technologies and zero trust architectures will increase, with a particular focus on protecting sensitive data and preventing breaches. Additionally, international collaboration and information sharing between security agencies will become fundamental to counter emerging threats.
Finally, the importance of rigorous NIS2 compliance and DORA compliance cannot be underestimated. Organizations must ensure that their security infrastructures are up to current regulations, adopting preventive and reactive measures to protect data and critical information.
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