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Ransomware victim Manufacturing

Proterial America, Ltd.

Listed by Metaencryptor on · organisation based in United States

us.proterial.com

Disclosed
Nov 7, 2026
Leak-site listing date
Threat group
Metaencryptor
62 victims listed
Country
United States
#1 most targeted
Sector
Manufacturing

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Metaencryptor. Figures and technique mappings are quoted from the source data, not inferred.

About Proterial America, Ltd.

Proterial, Ltd., headquartered in Tokyo, Japan, with consolidated revenue totaled about 881 billion yen ($8.3 billion) in fiscal 2019 (ended March 31, 2020), is one of the major member companies of the Proterial Group. Proterial America manufactures and markets a diverse portfolio of high-grade metal products and materials, magnetic materials and applications, high-grade functional components and equipment, wires, cables and related products. Data size: —

Source record: ransomware.live

About the Metaencryptor group

MetaEncryptor is a ransomware group first observed in mid-2023, targeting medium-to-large enterprises in legal, technology, logistics, manufacturing, and finance sectors primarily in the UK, Europe, and Southeast Asia, using AES-256/RSA-2048 encryption and double extortion. Metaencryptor has listed 55 victims since August 2023.

Incident analysis

Proterial America, Ltd. was listed by Metaencryptor ransomware, a group with 62 victims recorded in this database. The listing appeared on the group's leak site on November 7, 2026.

Proterial America, Ltd. is based in United States and operates in the Manufacturing sector. United States ranks #1 worldwide for ransomware disclosures, with 10,362 victims in this database.

Sector context. Manufacturing companies are frequently targeted because production downtime directly translates to financial loss. Ransomware operators exploit this time-sensitivity to demand higher ransoms and faster payment.

Metaencryptor typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was Proterial America, Ltd. attacked by ransomware?

Yes. Proterial America, Ltd. was listed as a victim of the Metaencryptor ransomware group on November 7, 2026. The organisation is based in United States and operates in the Manufacturing sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Proterial America, Ltd.?

Proterial America, Ltd. was attacked by Metaencryptor ransomware. Metaencryptor is one of the most active ransomware groups, having claimed 62 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Proterial America, Ltd. ransomware attack occur?

The ransomware attack on Proterial America, Ltd. was disclosed on November 7, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Proterial America, Ltd. ransomware attack?

The specific data stolen from Proterial America, Ltd. has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Manufacturing organisation, Proterial America, Ltd. likely held sensitive business data, client information, and operational records.

How can organisations protect against Metaencryptor attacks?

To defend against Metaencryptor and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.