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Hartwig Mechanical Inc

Claimed by Medusa · listed 1 year ago

456 GB
Data size
13m
Age
since listed · data leaked

Status timeline

  1. ListedJun 9, 2025
  2. Data leakeddate unknown

At a glance

Group
Medusa
Status
Data leaked
Country
United States
Sector
Construction
Listed on leak site
Jun 9, 2025
Data size
456 GB

About the victim

AI dossier — public-source company profile

Hartwig Mechanical Inc is a commercial and residential construction company based in Harvard, Illinois, with 10–19 employees and annual revenue between $1–5 million.

Industry
Commercial & Residential Construction
Address
20800 E. Brink Street, Harvard, IL 60033
Employees
10-19

Attack summary

Severity: high — Large-scale data exfiltration (456 GB) confirmed published by the ransomware group, affecting a small business with likely customer and operational data at risk.

Medusa claims to have exfiltrated 456 GB of data from the company. The group has published the data, though specific details on data categories are not provided in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Business records
  • Operational files
  • Client information

What the group claims

Hartwig Mechanical Inc is a company that operates in the Commercial & Residential Construction industry. It employs 10to19 people and has 1Mto5M of revenue. The company is headquartered in 20800 E. Brink Street Harvard, IL 60033 The total amount of data leakage is 456 GB

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 Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 635 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post May 5, 2026. The operation is currently active.

Also tracked as: MedusaLocker, MEDUSA LOCKER.

Timeline of this disclosure

  • June 9, 2025Hartwig Mechanical Inc listed by Medusaon the group's public leak site
Data size
456 GB

Other recent disclosures by Medusa

Medusa has been linked to 635 public victims on Darkfield. A sample of the most recent:

See the full Medusa dossier →

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 988 disclosures indexed across all operators we track. Geographically, Hartwig Mechanical Inc is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Medusa means Hartwig Mechanical Inc 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 Medusa'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.