Was Clarksville ISD hit by ransomware?

Clarksville ISD 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 Clarksville ISD breach?

Interlock published data attributed to Clarksville ISD. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Clarksville ISD

Claimed by Interlock · listed 7 months ago

Age

since listed · data leaked

Status timeline

ListedDec 18, 2025
Data leakeddate unknown

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Education
Listed on leak site: Dec 18, 2025

About the victim

AI dossier — public-source company profile

Clarksville Independent School District (CISD) is a public K-12 school district located in Clarksville, Texas. It operates multiple schools including Clarksville Middle High School and Cheatham Elementary School, serving the local community under the leadership of Superintendent Dr. Tracie Robinson. The district manages standard educational, administrative, and support functions including transportation, special education, and human resources.

Industry: K-12 Public Education
Address: Clarksville, Texas, United States

Attack summary

Severity: critical — Confirmed exfiltration and publication of SSNs for minors (students) at scale across multiple years, combined with employee SSNs, banking transactions, and financial data — constituting regulated PII (including children's data under FERPA/COPPA frameworks) at significant scale within a public educational institution.

The Interlock ransomware group claims to have exfiltrated a large volume of confidential data from Clarksville ISD, including Social Security Numbers of all students across multiple years and comprehensive employee data including SSNs, banking transactions, and financial records. The disclosure status is listed as data_published, indicating stolen data has been released.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Student Social Security Numbers
Employee Social Security Numbers
Employee banking transaction records
Employee financial data
Student records (multi-year)
Staff/employee personal data

What the group claims

Once again, we see how a certain school organization, Clarksville ISD, was attacked and compromised due to the negligence and irresponsibility of employees with other people's data, that is, other people, as a result of which a large amount of confidential data was compromised, including the SNN of all students for the entire year, as well as all employee data, including SNN, banking transactions, and financial components.

Sources

Victim siteclarksvilleisd.net
Leak posthttp://vhs6omcvvqdtmgae5cvpy4jfxfrw2l4b7e64j7fn7xeaqeppzab67oad.onion/index.php?p=

Source

Indexed 7 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

December 18, 2025Clarksville ISD 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, Clarksville ISD 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 Clarksville ISD 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.