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Organizations involved in this incident2024-05-29Iseto: ransomware leaks data of about 3.07 million people from about 100 client organizationsOpen the incident

13 results

GovernmentPrefectureTokushima, Tokushima[Through a supplier][Critical]
Tokushima Prefectural Government
Incidents 2Latest 2026-10-21
GovernmentMunicipalityAichi, Toyota[Through a supplier][Critical]
Toyota City
Incidents 2Latest 2026-10-21
GovernmentMunicipalityWakayama, Wakayama[Through a supplier][Critical]
Wakayama City
Incidents 1Latest 2024-05-29
CompanyInformation and communicationsKyoto, Kyoto, Nakagyo[Breached][Critical]
Iseto Inc.
Incidents 1Latest 2024-05-29Employees 439
CompanyFinance and insuranceEhime, Matsuyama[Through a supplier][Critical]
The Iyo Bank, Ltd.
Incidents 2Latest 2026-10-21
CompanyEducation and learning supportOsaka, Osaka, Yodogawa[Through a supplier][Critical]
Kumon Institute of Education Co., Ltd.
Incidents 1Latest 2024-05-29
CompanyFinance and insuranceTokyo, Chiyoda[Through a supplier][Major]
Sumitomo Mitsui Trust Bank, Limited
Incidents 1Latest 2024-05-29Employees 13,810
CompanyFinance and insuranceOsaka, Osaka, Kita[Through a supplier][Major]
Kubota Credit Co., Ltd.
Incidents 1Latest 2024-05-29Employees 150
NonprofitOther servicesKyoto, Kyoto, Shimogyo[Through a supplier][Major]
Kyoto Chamber of Commerce and Industry
Incidents 1Latest 2024-05-29
CompanyFinance and insuranceTokyo, Shinjuku[Through a supplier][Major]
Manulife Life Insurance Company
Incidents 1Latest 2024-05-29
CompanyFinance and insuranceOsaka, Osaka, Chuo[Through a supplier][Major]
Nippon Life Insurance Company
Incidents 2Latest 2026-10-21
CompanyFinance and insuranceTokyo, Shinjuku[Through a supplier][Major]
Saikyo Shinkin Bank
Incidents 1Latest 2024-05-29
CompanyFinance and insuranceAichi, Nagoya, Naka[Through a supplier][Major]
Tokai Shinkin Business Inc.
Incidents 1Latest 2024-05-29

	Role
Tokushima Prefectural Government	[Through a supplier]	[Critical]	Government	Prefecture	Tokushima, Tokushima	–	–	2	2026-10-21
Toyota City	[Through a supplier]	[Critical]	Government	Municipality	Aichi, Toyota	–	–	2	2026-10-21
Wakayama City	[Through a supplier]	[Critical]	Government	Municipality	Wakayama, Wakayama	–	–	1	2024-05-29
Iseto Inc.	[Breached]	[Critical]	Company	Information and communications	Kyoto, Kyoto, Nakagyo	439	–	1	2024-05-29
The Iyo Bank, Ltd.	[Through a supplier]	[Critical]	Company	Finance and insurance	Ehime, Matsuyama	–	–	2	2026-10-21
Kumon Institute of Education Co., Ltd.	[Through a supplier]	[Critical]	Company	Education and learning support	Osaka, Osaka, Yodogawa	–	–	1	2024-05-29
Sumitomo Mitsui Trust Bank, Limited	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Chiyoda	13,810	–	1	2024-05-29
Kubota Credit Co., Ltd.	[Through a supplier]	[Major]	Company	Finance and insurance	Osaka, Osaka, Kita	150	–	1	2024-05-29
Kyoto Chamber of Commerce and Industry	[Through a supplier]	[Major]	Nonprofit	Other services	Kyoto, Kyoto, Shimogyo	–	–	1	2024-05-29
Manulife Life Insurance Company	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Shinjuku	–	–	1	2024-05-29
Nippon Life Insurance Company	[Through a supplier]	[Major]	Company	Finance and insurance	Osaka, Osaka, Chuo	–	–	2	2026-10-21
Saikyo Shinkin Bank	[Through a supplier]	[Major]	Company	Finance and insurance	Tokyo, Shinjuku	–	–	1	2024-05-29
Tokai Shinkin Business Inc.	[Through a supplier]	[Major]	Company	Finance and insurance	Aichi, Nagoya, Naka	–	–	1	2024-05-29