Pequannock Township School District targeted by Interlock ransomware group

• Ransomware group: Interlock
• Country: United States
• Sector: Education
• Announcement date: August 15, 2025

The ransomware group known as Interlock has published a leak announcement on its platform, claiming to have compromised data belonging to the Pequannock Township School District. This announcement, which appeared on August 15, 2025, suggests a significant breach involving the educational institution's digital infrastructure.

Details of the alleged attack

On August 15, 2025, the Interlock group listed the Pequannock Township School District on their dedicated leak site. To support their claim of exfiltrating data, the group shared screenshots displaying a specific directory structure. While information regarding the specific capabilities and background of the Interlock group remains limited, the group's actions in this instance follow a pattern common among modern ransomware operations.

The screenshots provided by the threat actors show several high-level folders. These include directories labeled 'HomeDrive_Staff', 'MainOffice', 'Mathematics', 'Science', and 'IT'. The presence of these specific folder names indicates that the attackers may have gained access to various segments of the district's network, ranging from administrative and information technology sectors to specific academic departments.

Potential data impact

Based on the directory structure revealed in the screenshots, the breach may involve a variety of sensitive files. The visible folder names suggest that the following types of information may have been compromised:

• Staff records
• Administrative documents
• Academic records

The group has not provided specific information regarding the total volume of data stolen or the exact file count involved in this incident. Furthermore, no ransom demand has been publicly stated by the group in relation to this specific listing.

About the Pequannock Township School District

Pequannock Township School District is a public school district serving students from pre-kindergarten through twelfth grade in Morris County, New Jersey, USA. Comprising five schools, the district provides comprehensive educational services to the local community.

Risk assessment and organizational implications

The alleged breach poses a significant risk of exposing sensitive student and staff information, which is typical for educational institutions. Because the entity is a United States-based educational district, the incident may carry legal implications under the Family Educational Rights and Privacy Act (FERPA) and various state-level data privacy regulations. Such regulatory frameworks are designed to protect the privacy of student educational records and personal information.

The exposure of this data could lead to several secondary risks. For students and staff, the primary concerns include the risk of identity theft or being targeted by sophisticated, highly personalized phishing campaigns. In the context of modern cybercrime, leaked data is often leveraged by other threat actors or used as a tool for double extortion. Double extortion is a tactic where attackers not only encrypt an organization's data but also threaten to leak sensitive information publicly to increase pressure on the victim to pay the ransom.

For organizations in the education sector, such incidents highlight the necessity of robust cybersecurity postures. Common defensive steps for institutions include implementing strict access controls, maintaining comprehensive logging and monitoring to detect unauthorized movement within a network, and conducting regular forensic investigations to determine the scope of any potential breach. When a breach is suspected, notifying affected stakeholders is a critical component of incident response and regulatory compliance.