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

November 24, 2025Westrian Group listed by Interlockon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Westrian Group 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

JR Engineering

listed as Westrian Group · Claimed by Interlock · listed 6 months ago

Age

since listed · data leaked

Status timeline

Listed
Nov 24, 2025
Data leaked

At a glance

Group: Interlock
Status: Data leaked
Country: United States
Sector: Not Found
Listed on leak site: Nov 24, 2025

About the victim

AI dossier — public-source company profile

JR Engineering is a Colorado-based civil engineering and land surveying consulting firm founded in 1973. The company operates four offices across Colorado (Centennial, Colorado Springs, Fort Collins, and Genesee) and provides services in civil engineering, planning, construction services, landscape architecture, land surveying, transportation, water resources, and subsurface utility engineering. It serves a diverse mix of public and private clients across Colorado, Wyoming, New Mexico, and Arizona.

Industry: Civil Engineering & Land Surveying
Address: Centennial, CO (headquarters); additional offices in Colorado Springs, Fort Collins, and Genesee, Colorado
Employees: 51-200
Founded: 1973

Attack summary

Severity: high — The group claims confirmed exfiltration and public publication of sensitive business data including client databases, confidential contracts, and proprietary engineering designs, representing significant reputational and financial harm to the company and its clients.

The Interlock ransomware group claims to have compromised JR Engineering and exfiltrated data including client databases, confidential client contracts, and current engineering sketches and models, which they state are now publicly available.

high

Data the group says was taken

AI dossier — extracted from the leak post

Client databases
Confidential client contracts
Engineering sketches and models
Business/project files

What the group claims

JR Engineering provides services in land management, surveying, land transportation, water resources, and structural design! This company was compromised due to extremely poor security and a weak IT department. Client databases were lost, including confidential contracts with clients and more! All of the company's current sketches and models are now publicly available, which could ruin its reputation and financial position!

Sources

Victim sitejrengineering.com
Leak posthttp://j76ts5r62mwtfqg6t2po7komao65jzgglaavnvloeltfenazpt57vaad.onion/index.php?p=

Source

Indexed 6 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.