Was Kalamazoo Public School District hit by ransomware?

Kalamazoo Public School District was listed by the Interlock ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Interlock ransomware group?

Interlock is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Kalamazoo Public School District breach?

Interlock published data attributed to Kalamazoo Public School District. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Kalamazoo Public School District

Claimed by Interlock · listed 1 year ago

13m

Age

since listed · data leaked

Status timeline

ListedMay 23, 2025
Data leakeddate unknown

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Education
Listed on leak site: May 23, 2025

About the victim

AI dossier — public-source company profile

Kalamazoo Public School District is a public educational institution serving the Kalamazoo, Michigan area. It operates 25 public schools providing services from preschool through high school, including adult education, special education, and extracurricular programs.

Industry: Public Education
Address: Kalamazoo, Michigan, United States
Employees: 2000-3000

Attack summary

Severity: high — Public school district breach involving likely student and staff PII at scale; educational institutions handle sensitive minor data and are critical infrastructure. Confirmed data publication by threat actor elevates severity despite lack of specific proof count details.

The Interlock group claims to have breached Kalamazoo Public Schools and published exfiltrated data. The specific nature of the attack (encryption, exfiltration, or both) and the scope of data compromised are not detailed in the available post excerpt.

high

Data the group says was taken

AI dossier — extracted from the leak post

Student records
Staff directory and personnel information
Financial documents
Board meeting materials
Policies and procedures
Administrative communications

What the group claims

Kalamazoo Public Schools oversees 25 public schools in the district . Provides educational services for students ranging from preschool to high school. The district offers diverse programs including adult education, special education, and various extracurricular activities to support student growth. It aims to serve the local community by fostering academic excellence and personal development among students. Additionally, it collaborates with various community organizations to enhance educational outcomes and support for families.

Sources

Source

Indexed 1 year 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 Interlock

Interlock is a recently emerged ransomware group that began operations in October 2024, primarily motivated by financial gain through extortion activities targeting organizations across multiple sectors. The group's country of origin and potential affiliations remain unclear given their recent emergence, with insufficient public documentation to determine whether they operate as an independent entity or under a Ransomware-as-a-Service model. Limited public information exists regarding their specific attack methodologies, initial access vectors, or encryption techniques, as major cybersecurity firms and law enforcement agencies have not yet published comprehensive technical analyses of their operations. Since beginning operations, Interlock has reportedly compromised approximately 100 victims, with their targeting primarily focused on organizations in English-speaking countries including the United States, Canada, United Kingdom, and Australia, as well as Italy, while demonstrating a preference for attacking education, manufacturing, healthcare, and public sector entities. The group remains active as of late 2024, though comprehensive threat intelligence profiles from established security research organizations have not yet been published due to the group's recent emergence in the threat landscape. The group has been linked to 114 public disclosures across our corpus. First observed on a leak site on October 13, 2024; most recent post July 10, 2026. The operation is currently active.

Timeline of this disclosure

May 23, 2025Kalamazoo Public School District listed by Interlockon the group's public leak site

Other recent disclosures by Interlock

Interlock has been linked to 114 public victims on Darkfield. A sample of the most recent:

See the full Interlock dossier →

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 1,082 disclosures indexed across all operators we track. Geographically, Kalamazoo Public School District is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Interlock means Kalamazoo Public School District 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, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Interlock'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.