Was Seoul Semiconductor hit by ransomware?

Seoul Semiconductor was listed by the Metaencryptor 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 Metaencryptor ransomware group?

Metaencryptor 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 Seoul Semiconductor breach?

Metaencryptor published data attributed to Seoul Semiconductor. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Seoul Semiconductor

Claimed by Metaencryptor · listed 3 years ago

$842M

Ransom

demanded

35m

Age

since listed · data leaked

Status timeline

ListedAug 16, 2023
Data leakeddate unknown

At a glance

Group: Metaencryptor
Status: Data leaked
Country: South Korea
Sector: Manufacturing
Listed on leak site: Aug 16, 2023
Ransom demanded: $842M
Estimated revenue: $842M

About the victim

AI dossier — public-source company profile

Seoul Semiconductor is a South Korean LED manufacturer headquartered in Ansan, Gyeonggi-do, and is ranked among the top three LED companies globally. The company converts electric energy into light using eco-friendly and energy-efficient technologies, holding a vast patent portfolio built over more than 30 years of R&D. It is publicly listed on the Korea Exchange with reported 2022 revenue of approximately $842 million USD.

Industry: LED Semiconductor Manufacturing
Address: 97-11, Sandan-ro 163beon-gil, Danwon-gu, Ansan-si, Gyeonggi-do, South Korea
Employees: 1001-5000
Founded: 1987

Attack summary

Severity: critical — Seoul Semiconductor is a globally significant semiconductor/LED manufacturer with extensive proprietary R&D and patent portfolios; confirmed data publication (disclosed status: data_published) of such intellectual property and business data from a top-3 global LED company constitutes a critical exfiltration event with major commercial and national-security-adjacent implications.

The Metaencryptor group claims to have attacked Seoul Semiconductor and has published data, indicating likely exfiltration of company data including what may include proprietary R&D, patent documentation, and business records. The ransom figure cited ($842M) appears to correspond to the company's annual revenue rather than a ransom demand.

critical

Data the group says was taken

AI dossier — extracted from the leak post

R&D documentation
Patent portfolio files
Financial records
Corporate business data

What the group claims

Seoul Semiconductor is the top LED manufacturing company in Korea and No. 3 in the world. Over the past 30 years, Seoul has devoted itself to R&D with a vast patent portfolio and is leading second generation LED technology. Stock: Korea Exchange. Revenue: $842 M Year 2022

Sources

Source

Indexed 3 years 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 31 public disclosures across our corpus. First observed on a leak site on August 16, 2023; most recent post June 24, 2025. The operation is currently inactive.

Timeline of this disclosure

August 16, 2023Seoul Semiconductor listed by Metaencryptoron the group's public leak site

Ransom demanded: $842M

Other recent disclosures by Metaencryptor

Metaencryptor has been linked to 31 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 3,681 disclosures indexed across all operators we track. Geographically, Seoul Semiconductor is reported in South Korea, a country with 48 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Metaencryptor means Seoul Semiconductor 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 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.