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 109 public disclosures across our corpus. First observed on a leak site on October 13, 2024; most recent post May 11, 2026. The operation is currently active.

Timeline of this disclosure

October 29, 2025Pritchard Brown & Chillicothe Metal listed by Interlockon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, Pritchard Brown & Chillicothe Metal is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Pritchard Brown & Chillicothe Metal Company (CMCO)

listed as Pritchard Brown & Chillicothe Metal · Claimed by Interlock · listed 7 months ago

Age

since listed · data leaked

Status timeline

Listed
Oct 29, 2025
Data leaked

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Manufacturing
Listed on leak site: Oct 29, 2025

About the victim

AI dossier — public-source company profile

Pritchard Brown and Chillicothe Metal Company (CMCO) are two collaborating U.S. manufacturers specializing in custom protective enclosures and microclimate control systems for harsh operating environments. Their combined portfolio serves industries including energy, utilities, petrochemical, mining, and defense, with over 40,000 projects completed worldwide. Notable projects include work on the Statue of Liberty and NASA facilities.

Industry: Protective Enclosures & Microclimate Control Systems Manufacturing
Founded: 1947

Attack summary

Severity: high — Data has been published (confirmed exfiltration) for two manufacturers operating in defense, energy, and critical infrastructure sectors; defense-related project data and engineering files represent significant sensitivity even absent confirmed PII at scale.

The Interlock ransomware group claims to have compromised both Pritchard Brown and Chillicothe Metal Company, disclosing the attack with a 'data_published' status, indicating exfiltration and publication of company data. No specific ransom amount or data volume has been stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business/operational documents
Engineering and design files
Project records
Corporate data

What the group claims

Pritchard Brown and Chillicothe Metal Company (CMCO) are two manufacturers that collaborate to develop comprehensive solutions in the field of protective enclosures and microclimate control systems. Founded in 1947, Pritchard Brown specializes in custom-designed protective enclosures, offering a range of weatherproof, weather-resistant, and noise-absorbing models specifically designed for harsh operating environments. With over 50 years of experience, Chillicothe Metal Company complements Pritchard Brown's offerings by specializing in protective enclosures and complete generator sets. Operating in a wide range of industries, including energy, utilities, petrochemical, mining, and defense, CMCO has completed more than 40,000 projects at facilities around the world. Its expertise in design, engineering, and manufacturing is evidenced by its work on high-profile projects such as the Statue of Liberty and NASA.

Sources

Victim sitepritchardbrown.com & cmcousa.com
Leak posthttp://5s2rv76limdt3eelmoh2vw6xovckjl563tjdifplvyxezdchcyn5xxyd.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.