M.C.S. Steel Public Company Limited

CountryTHThailand

SectorManufacturing

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Key factsRECORD

Ransom amountNot disclosed

Data size exfiltratedNot disclosed

Screenshot on leak siteYes

Press mentioned by groupNo

Description

M.C.S. Steel Public Company Limited M.C.S. Steel Public Company Limited - largest structural-steel fabricatorin Thailand, SET-listed (ticker MCS).Total files: 2,314,625Total volume: 4.2 TB'Senior Advisor to Chairmen of the Board' paid 800,000 JPY/month viaTrust Engineering K.K. (Tokyo) to Keiyo Bank Chiba account 5376091,term Nov-2025..Oct-2027 - while Mr. Yokoyama Yukio also sits on MCSpayroll. Related-party flow outside SET disclosures.Chairman & CEO Dr. Naiyuan Chi carries a PAYROLL 'advisor' gross of12.92M THB/yr (2023-2026); lifetime net receipts ~79M THB (2015-2026).Advisor/consultant contracts to Haneishi, Iijima, Ogilvie, Yang -overlapping the company's Japanese payroll.Identity documents of staff incl. Chairman's daughter (Thai nationalIDs, passport, house registration), foreign managers' work permits.Myanmar workshop staff charged 500-800 THB per clinic visit (signedmemo, 2023) - labour-protection exposure.Prior Faust ransomware infection inside the network (victim idA2242861-3499) - security failures never remediated; SQL credentialsand Windows OEM keys stored in plaintext.Confidential pipeline of Japan's Big-5 contractors incl. site names. More

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