Bishop Ireton High School listed on Interlock ransomware leak site

• Ransomware group: Interlock
• Country: United States
• Sector: Education
• Announcement date: November 3, 2025

Interlock claims data breach at Bishop Ireton High School

The threat actor known as Interlock has listed Bishop Ireton High School on its leak site, claiming to have compromised the institution's data. This announcement, which was discovered on November 3, 2025, suggests a significant breach involving the educational institution's digital environment. While the group has made these claims, the full extent of the incident remains to be verified through independent investigation.

Ransomware groups often utilize leak sites to exert pressure on their victims. In many modern cyberattacks, groups employ a tactic known as double extortion. In this scenario, attackers do not just encrypt an organization's files to disrupt operations; they also exfiltrate sensitive data before the encryption occurs. The threat of releasing this stolen information on a public platform serves as additional leverage to compel the victim to pay a ransom. By publishing a victim's name, the group aims to damage the organization's reputation and create urgency through the threat of public exposure.

Details of the alleged attack

According to the claim made by Interlock, the alleged attack took place on November 20, 2024. This suggests that the data may have been exfiltrated a significant time before the public announcement was made on the leak site. The listing provided by the threat actor includes a directory structure that allegedly belongs to the school's administrative and academic departments.

The group has provided screenshots to support their claim, which display several specific folders. These folders are labeled as 'Administration', 'Fac', 'FSE', 'FSSRV', and 'ZABICKI-2024'. While the specific contents of every file are not detailed in the public announcement, the directory names suggest that the breach involves various internal organizational structures. No information was provided regarding the total size of the data stolen or the specific amount of files contained within the directories.

Potential data exposure

Based on the directory structure and the nature of the institution, it is assessed that the leaked files may contain administrative and academic documentation. The specific categories of data identified as potentially affected include:

• Administrative documents
• Academic data

The exposure of such documentation can lead to various secondary risks. For educational institutions, the loss of sensitive information can result in identity theft and targeted phishing attacks directed at students, parents, and staff members. When personal information is leaked, attackers often use it to craft highly convincing social engineering campaigns, making it difficult for individuals to distinguish between legitimate communications and malicious attempts to steal further credentials or funds.

About Bishop Ireton High School

Bishop Ireton High School is a Catholic college preparatory school located in Alexandria, Virginia. The school offers academic programs and a variety of extracurricular activities focused on the spiritual, intellectual, creative, and social development of its students.

Implications and organizational response

This breach may pose significant risks to the school community. Such attacks on educational institutions may trigger legal processes under US state laws and relevant data privacy regulations due to the exposure of sensitive personal information. The content of the leaked data may contain critical information regarding the institution's operational processes, which could impact the school's day-to-day functions.

Public information about the Interlock group is limited, making it difficult to attribute the attack or understand the group's full capabilities. For organizations facing such threats, it is often considered important to fulfill data breach notification obligations and inform the affected parties promptly. Taking proactive steps, such as implementing robust multi-factor authentication, maintaining regular offline backups, and conducting regular security awareness training, are common defensive measures used to mitigate the impact of such incidents. For an institution in this sector, ensuring compliance with privacy regulations and maintaining transparent communication with stakeholders is a critical component of incident response.