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Nippon Steel Corporation

Claimed by Metaencryptor · listed 15 hours ago

Today
Age
since listed · data leaked

Status timeline

  1. ListedSep 15, 2026
  2. Data leakeddate unknown

At a glance

Group
Metaencryptor
Status
Data leaked
Country
Japan
Sector
Manufacturing
Listed on leak site
Sep 15, 2026

About the victim

AI dossier — public-source company profile

Nippon Steel Corporation is Japan's largest steelmaker and one of the world's leading steel producers, headquartered in Tokyo. The company manufactures advanced steel products for automotive, construction, energy, infrastructure, and industrial sectors, operating globally through subsidiaries and production facilities with approximately 138,000 employees.

Industry
Steel & Metal Manufacturing
Address
Tokyo, Japan
Employees
138453

Attack summary

Severity: low — Listing/announcement with no published proof files, no confirmed data exfiltration details, and no operational impact stated. The group explicitly notes files have not yet been published.

The metaencryptor group claims to have compromised Nippon Steel Corporation but states that files for this campaign have not been published yet. No specific data exfiltration or encryption details are disclosed in the leak post.

low

What the group claims

Nippon Steel Corporation is Japan’s largest steelmaker and one of the world’s leading steel producers. Headquartered in Tokyo, the company manufactures and supplies advanced steel products for the automotive, construction, energy, infrastructure, and industrial sectors. Nippon Steel operates globally through a large network of subsidiaries and production facilities, with annual revenue of approximately $67 billion and more than 138,000 employees.

The leak post

captured from the group's site
Nippon Steel Corporation is Japan’s largest steelmaker and one of the world’s leading steel producers. Headquartered in Tokyo, the company manufactures and supplies advanced steel products for the automotive, construction, energy, infrastructure, and industrial sectors. Nippon Steel operates globally through a large network of subsidiaries and production facilities, with annual revenue of approximately $67 billion and more than 138,000 employees.
Files for this campaign have not been published yet.

Sources

Source

Indexed 15 hours 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 Metaencryptor

Metaencryptor is a relatively new ransomware group that emerged in August 2023, operating with primarily financial motivations and targeting organizations across multiple sectors and geographical regions. The group appears to be an independent operation rather than a Ransomware-as-a-Service model, though limited public documentation makes definitive attribution challenging regarding their specific country of origin or connections to established cybercriminal networks. Based on their targeting patterns, Metaencryptor demonstrates a preference for manufacturing organizations, business services, and transportation/logistics companies, with their operations concentrated primarily in Western nations including Germany, the United States, Canada, Spain, and the United Kingdom. With 31 documented victims since their emergence, the group represents a moderate but persistent threat in the ransomware landscape. However, due to their recent emergence and relatively lower profile compared to major ransomware families, comprehensive technical analysis of their attack methodologies, encryption techniques, and specific initial access vectors has not been extensively documented by major cybersecurity firms or government agencies. The group's current operational status remains active as of available intelligence, though the limited public reporting suggests they operate with a smaller scale and lower visibility than prominent ransomware-as-a-service operations that typically attract more attention from law enforcement and security researchers. The group has been linked to 44 public disclosures across our corpus. First observed on a leak site on August 16, 2023; most recent post September 15, 2026. The operation is currently inactive.

Timeline of this disclosure

  • September 15, 2026Nippon Steel Corporation listed by Metaencryptor on the group's public leak site

Other recent disclosures by Metaencryptor

Metaencryptor has been linked to 44 public victims on Darkfield. A sample of the most recent:

See the full Metaencryptor dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,696 disclosures indexed across all operators we track. Geographically, Nippon Steel Corporation is reported in Japan, a country with 89 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Metaencryptor means Nippon Steel Corporation 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, JPCERT/CC (Japan), as required for your jurisdiction.
  • Monitor for the data appearing on Metaencryptor'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.