Was Kent District Library hit by ransomware?

Kent District Library 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 Kent District Library breach?

Interlock published data attributed to Kent District Library. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Kent District Library

Claimed by Interlock · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedMay 11, 2026
Data leakeddate unknown

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Public Sector
Listed on leak site: May 11, 2026

About the victim

AI dossier — public-source company profile

Kent District Library (KDL) is a public library system serving Kent County, Michigan, operating multiple branch locations throughout the region. It provides library services including lending, digital resources, and community programming to residents of the greater Grand Rapids area. KDL is a publicly funded institution governed by a board of trustees.

Industry: Public Library System
Address: 814 West River Center Drive NE, Comstock Park, MI 49321
Employees: 201-500
Founded: 1937

Attack summary

Severity: high — Confirmed exfiltration and publication of PII for both customers and employees of a public institution, combined with sensitive operational data (building plans, incident reports) and financial records; the public-sector nature and scale of patron data elevates severity to high.

The Interlock ransomware group claims to have exfiltrated confidential data from Kent District Library, including financial documents, organizational contact information, personal data on customers and employees, building plans and blueprints, and information about concealed incidents; the data has been published as disclosed status indicates.

high

Data the group says was taken

AI dossier — extracted from the leak post

Confidential financial documents
Organizational contact information
Customer personal data
Employee personal data
Building plans and blueprints
Incident reports

What the group claims

Kent District Library (KDL) is a public library system that owns and operates libraries throughout Michigan. However, it does not manage its own security, which is damaging its reputation. We are providing you with confidential financial documents, contact information for organizations, personal data on customers and employees, building plans and blueprints, as well as information about various incidents that they are concealing.

Sources

Victim sitehttps:kdl.org
Leak posthttp://k6aw4if6phmqcdp5wzfdjfb3plmybzpkcssmgvv5nltv23tndvh4ewid.onion/index.php?p=

Source

Indexed 2 months 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 11, 2026Kent District Library 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 Public Sector sector, which has 466 disclosures indexed across all operators we track. Geographically, Kent District Library is reported in United States, a country with 3,115 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Interlock means Kent District Library 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.