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McMillan James Equipment Company (MJEC)

Claimed by Weyhro · listed 1 year ago

15m
Age
since listed · data leaked

Status timeline

  1. ListedMar 25, 2025
  2. Data leakeddate unknown

At a glance

Group
Weyhro
Status
Data leaked
Country
United States
Sector
Manufacturing
Listed on leak site
Mar 25, 2025

About the victim

AI dossier — public-source company profile

McMillan James Equipment Company (MJEC) is an HVAC-R and plumbing solutions provider headquartered in Texas, USA, established in 1987. The company specializes in custom heating, ventilation, air-conditioning systems, and engineered plumbing solutions for commercial and industrial applications, serving over 1,200 clients and representing 30+ manufacturers.

Industry
HVAC & Plumbing Solutions
Founded
1987

Attack summary

Severity: low — Post indicates data_published status but provides no proof files, screenshots, or specific data inventory. No operational impact or sensitive data categories are confirmed in the available excerpt.

The weyhro group claims to have compromised MJEC and published data. No specific details regarding encryption, exfiltration method, or data categories are explicitly stated in the available post excerpt.

low

Original description

AI-summarised, not from the leak post

McMillan James Equipment Company (MJEC) specializes in providing end-to-end HVAC solutions for commercial and industrial applications. The company, headquartered in Texas, USA, offers a variety of services, including system design, equipment sales, installation, and maintenance. MJEC prides itself on implementing innovative technologies to improve indoor air quality and energy efficiency.

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 weyhro

Weyhro is an emerging ransomware group that was first observed in March 2025, appearing to be primarily financially motivated based on their targeting patterns and operational behavior. The group's origin and affiliations remain unclear due to their recent emergence, with insufficient public documentation from major threat intelligence sources to confirm their country of origin, potential links to established ransomware families, or whether they operate under a Ransomware-as-a-Service model. With only 14 documented victims since their March 2025 debut, specific details about their attack methodology, initial access vectors, encryption techniques, and data exfiltration practices have not been comprehensively documented by CISA, FBI, Mandiant, or other reputable security researchers. The group has demonstrated a geographically diverse targeting approach, primarily focusing on victims in the United States, Germany, Canada, Barbados, and Italy, with a sector preference for manufacturing, financial services, business services, and technology organizations. Given the group's recent emergence and limited victim count, no major high-profile campaigns, record ransom demands, or law enforcement actions have been publicly reported. Weyhro appears to remain active as of current reporting, though their operational tempo and long-term sustainability remain to be determined given the limited intelligence available on this nascent threat actor. The group has been linked to 14 public disclosures across our corpus. First observed on a leak site on March 6, 2025; most recent post August 11, 2025. The operation is currently inactive.

Timeline of this disclosure

  • March 25, 2025McMillan James Equipment Company (MJEC) listed by weyhroon the group's public leak site

Other recent disclosures by weyhro

weyhro has been linked to 14 public victims on Darkfield. A sample of the most recent:

See the full weyhro dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,681 disclosures indexed across all operators we track. Geographically, McMillan James Equipment Company (MJEC) is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by weyhro means McMillan James Equipment Company (MJEC) 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 weyhro'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.