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C3 Group

Claimed by Nitrogen · listed 1 year ago

12m
Age
since listed · data leaked

Status timeline

  1. ListedJul 16, 2025
  2. Data leakeddate unknown

At a glance

Group
Nitrogen
Status
Data leaked
Country
United States
Listed on leak site
Jul 16, 2025

About the victim

AI dossier — public-source company profile

C3 Group is a multi-discipline engineering and contracting organization specializing in building science, restoration, industrial maintenance, foundation systems, environmental technologies, and municipal infrastructure. The group operates multiple subsidiary companies including C3 Environmental, C3 Specialty Glazing, C3 Industrial, and others.

Industry
Engineering & Contracting Services

Attack summary

Severity: medium — Data published by ransomware group with no stated ransom, but lack of proof count, data size inventory, or specifics on sensitive data types prevents higher classification. Engineering/contracting firm data exposure is moderately sensitive but not inherently regulated/PII-at-scale.

Nitrogen claims to have attacked C3 Group and published data. The leak post indicates data exfiltration but provides no specific details on scope, data types, or operational disruption.

medium

What the group claims

C3 Group is a large, well-established engineering company offering a wide range of services, from restoration and industrial injection to water treatment and geotechnical projects.

Screenshot of the leak post

Leak screenshot for C3 Group

Sources

Source

Indexed 1 year 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 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 57 public disclosures across our corpus. First observed on a leak site on September 30, 2024; most recent post June 3, 2026. The operation is currently active.

Timeline of this disclosure

  • July 16, 2025C3 Group listed by Nitrogenon the group's public leak site

Other recent disclosures by Nitrogen

Nitrogen has been linked to 57 public victims on Darkfield. A sample of the most recent:

See the full Nitrogen dossier →

Sector and geography

Geographically, C3 Group is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Nitrogen means C3 Group 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 Nitrogen'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.