Disclosure context

About Nitrogen

**Nitrogen** is an emerging ransomware group that first appeared in September 2024, operating with apparent financial motivations through targeted extortion campaigns primarily focused on North American and European organizations. The group has claimed responsibility for attacks against 46 documented victims across multiple sectors, with manufacturing companies representing their most frequent targets. Limited public information suggests the group operates independently rather than as a Ransomware-as-a-Service model, though their specific country of origin and potential affiliations with other cybercriminal organizations remain undetermined by major security research firms. Their attack methodology appears to focus on opportunistic targeting across diverse industries including manufacturing, business services, technology, and hospitality sectors, with the United States serving as their primary area of operations followed by significant activity in Canada, Portugal, India, and France. Due to the group's recent emergence and relatively low profile compared to established ransomware families, detailed technical analysis of their encryption methods, data exfiltration practices, and initial access vectors has not been extensively documented by major threat intelligence providers such as CISA, FBI, or Mandiant. Given the group's recent formation in September 2024, no major high-profile campaigns or significant law enforcement actions have been publicly reported, with their victim portfolio consisting primarily of small to medium-sized enterprises rather than critical infrastructure or Fortune 500 companies. Nitrogen appears to remain active as of current reporting, though their limited operational history and relatively small victim count suggest they are still establishing their presence within the broader ransomware ecosystem. The group has been linked to 56 public disclosures across our corpus. First observed on a leak site on September 30, 2024; most recent post May 13, 2026. The operation is currently active.

Timeline of this disclosure

May 13, 2026Fireproof Contractors, Inc. listed by Nitrogenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 415 disclosures indexed across all operators we track. Geographically, Fireproof Contractors, Inc. 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

Fireproof Contractors, Inc.

Claimed by Nitrogen · listed 8 days ago

Age

since listed · listed for ransom

Status timeline

Listed
May 13, 2026

Current state: Listed for ransom

At a glance

Group: Nitrogen
Status: Listed for ransom
Country: United States
Sector: Construction
Listed on leak site: May 13, 2026

About the victim

AI dossier — public-source company profile

Fireproof Contractors, Inc. is a U.S.-based construction company specializing in fireproofing and related contracting services. No public website content was available to confirm additional details about its scale, headquarters, or specific service lines. The company operates in the construction sector within the United States.

Industry: Construction & Fireproofing Contracting

Attack summary

Severity: low — This is a bare listing with no stated ransom, no data size, no proof files, no exfiltration claims, and no operational impact described. The leak post content appears to be a batch listing of unrelated victims with no specific detail attributable to Fireproof Contractors, Inc.

The Nitrogen ransomware group has listed Fireproof Contractors, Inc. as a victim. No specific claims regarding encryption, exfiltration, data volume, or ransom amount are stated in the post.

low

What the group claims

Specializes in commercial fireproofing, thermal and acoustical insulation, waterproofing, and firestop services.

The leak post

captured from the group's site

The world's largest contract electronics manufacturer, whose operations are officially divided into four key segments: consumer electronics, cloud and networking products, computing equipment, as well as components and other products. 
PCCA supports the creation of personalized medicine and innovative products, as well as pharmaceutical compounding. 
One of the leaders in video stream optimization, security, and content monetization. Offers advanced solutions for efficient video delivery across all digital ecosystems. 
TThe company operates in the wholesale trade of engineering materials and equipment.. 
The company specializes in the development, engineering, and manufacturing of various components and systems for the automotive industry and other sectors. 
Specializing in instrumental welding (TIG, Micro TIG, MIG), microlaser welding, laser cladding, laser hardening, laser engraving, stress relieving, and mechanical processing. 
Specializing in the production of structural steel and construction. 
A major manufacturer of art materials for professional artists and designers: acrylic paints, oils, watercolors, pastels and other media/materials. 
AvtechTyee is a company operating in…

Sources

Leak posthttp://nitrogenczslprh3xyw6lh5xyjvmsz7ciljoqxxknd7uymkfetfhgvqd.onion

Source

Indexed 8 days 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.