Was Seoyon E-Hwa Summit hit by ransomware?

Seoyon E-Hwa Summit was listed by the netrunner ransomware operation (South Korea), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the netrunner ransomware group?

netrunner is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Seoyon E-Hwa Summit breach?

netrunner published data attributed to Seoyon E-Hwa Summit. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Seoyon E-Hwa Summit

Claimed by Netrunner · listed 3 months ago

Age

since listed · data leaked

Status timeline

ListedApr 3, 2026
Data leakeddate unknown

At a glance

Group: Netrunner
Status: Data leaked
Country: South Korea
Sector: Manufacturing
Listed on leak site: Apr 3, 2026

About the victim

AI dossier — public-source company profile

Seoyon E-Hwa Summit is a subsidiary of Seoyon E-Hwa (KRX: 200880), a South Korean automotive parts manufacturer. It operates as part of Seoyon E-Hwa's international production network, with presence in both India and South Korea. The company manufactures automotive components as part of a global supply chain.

Industry: Automotive Components Manufacturing
Employees: 1500

Attack summary

Severity: high — Confirmed exfiltration and encryption (both) of data from a publicly listed automotive manufacturing subsidiary with ~1500 employees and reported revenues of ~$120M; data has been published, indicating significant business data exposure.

The NetRunner ransomware group claims to have both encrypted and exfiltrated data from Seoyon E-Hwa Summit. The post is marked as 'data_published', indicating exfiltrated data has been or is being released.

high

Data the group says was taken

AI dossier — extracted from the leak post

Exfiltrated company data
Operational/business files

What the group claims

Seoyon E‑Hwa Summit is a subsidiary of Seoyon E‑Hwa that manufactures automotive components, operating as part of Seoyon E‑Hwa’s international production network.

The leak post

captured from the group's site

NetRunner Leak NetRunner Leak Seoyon E-Hwa Summit eoyonehap.com eoyoneh.com India South Korea KRX:200880 120M 1500 Locked, Exfiltrated Seoyon E‑Hwa Summit is a subsidiary of Seoyon E‑Hwa that manufactures automotive components, operating as part of Seoyon E‑Hwa’s international production network. Access Data GEG Telecomunicazioni geg.it Monza, Lombardy, Italy N/A N/A N/A Locked, Exfiltrated GEG srl (est. 1981) designs and builds integrated mobile radio systems across Italy. Over 35 years it served 500+ public administrations and manages 100,000+ radios. Since 2004 it is Italy’s exclusive DAMM TETRA distributor. It held ~60% of the civilian TETRA market (350+ base stations) Access Data Shiraume Hospital www.shiraume.or.jp Iwata, Shizuoka, Japan N/A N/A N/A Locked, Exfiltrated Shiramume Hospital is a regional general hospital in Japan providing comprehensive inpatient and outpatient care. It offers services in internal medicine, surgery, emergency care, obstetrics/gynecology, and rehabilitation, supported by diagnostic imaging and laboratory facilities. Access Data Nippon Medical School Musashi Kosugi Hospital www.nms.ac.jp/kosugi-h Kosugimachi, Kawasaki, Japan N/A 100M 902 Locked, E…

Sources

Victim siteseoyonehap.com
Leak posthttp://netrunrsb3bivj5gnwajzxlig5qkteb6edgthxj7fmsvhkzxtwfxwaad.onion/view/SEOYON

Source

Indexed 3 months 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 netrunner

Based on the limited publicly available information, netrunner is a relatively new ransomware group that first emerged in April 2026 with documented attacks against at least six organizations. The group appears to be financially motivated, targeting a diverse range of sectors including healthcare, consumer services, telecommunications, manufacturing, and agriculture across multiple countries including Japan, the United States, Jordan, Italy, and South Korea. Due to the recent emergence of this group and limited public reporting from established threat intelligence sources, detailed information about their country of origin, operational affiliations, specific attack methodologies, encryption techniques, or whether they operate as a Ransomware-as-a-Service model remains undocumented by major cybersecurity organizations such as CISA, FBI, or Mandiant. The group's targeting pattern suggests opportunistic victim selection rather than geopolitically motivated attacks, given the broad geographic and sectoral distribution of their documented victims. No major high-profile campaigns or significant law enforcement actions against netrunner have been publicly reported by reputable security researchers at this time. Given the group's recent emergence in 2026, current activity status and operational capabilities require further monitoring and analysis by the cybersecurity community. The group has been linked to 9 public disclosures across our corpus. First observed on a leak site on April 3, 2026; most recent post May 16, 2026. The operation is currently active.

Timeline of this disclosure

April 3, 2026Seoyon E-Hwa Summit listed by netrunneron the group's public leak site

Other recent disclosures by netrunner

netrunner has been linked to 9 public victims on Darkfield. A sample of the most recent:

See the full netrunner 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, Seoyon E-Hwa Summit is reported in South Korea, a country with 48 ransomware disclosures in our corpus.

If your organisation is affected

A listing by netrunner means Seoyon E-Hwa Summit 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, KrCERT/CC (South Korea), as required for your jurisdiction.
Monitor for the data appearing on netrunner'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.