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Organizations involved in this incident2026-08-15Ryomo Systems: ransomware attackOpen the incident

5 results

GovernmentMunicipalityGunma, Isesaki[Through a supplier][Critical]
Isesaki City
Incidents 2Latest 2026-10-21
CompanyInformation and communicationsGunma, Kiryu[Breached][Critical]
Ryomo Systems Co., Ltd.
Incidents 1Latest 2026-08-15Employees 759
CompanyElectricity, gas, heat and waterSaitama, Fujimi[Through a supplier][Critical]
Daito Gas Inc.
Incidents 1Latest 2026-08-15Employees 200
CompanyElectricity, gas, heat and waterMie, Nabari[Through a supplier][Major]
Nabari Kintetsu Gas Inc.
Incidents 1Latest 2026-08-15
CompanyElectricity, gas, heat and waterNagano, Nagano[Through a supplier][Major]
Nagano Toshi Gas Inc.
Incidents 1Latest 2026-08-15Employees 231

	Role
Isesaki City	[Through a supplier]	[Critical]	Government	Municipality	Gunma, Isesaki	–	–	2	2026-10-21
Ryomo Systems Co., Ltd.	[Breached]	[Critical]	Company	Information and communications	Gunma, Kiryu	759	–	1	2026-08-15
Daito Gas Inc.	[Through a supplier]	[Critical]	Company	Electricity, gas, heat and water	Saitama, Fujimi	200	–	1	2026-08-15
Nabari Kintetsu Gas Inc.	[Through a supplier]	[Major]	Company	Electricity, gas, heat and water	Mie, Nabari	–	–	1	2026-08-15
Nagano Toshi Gas Inc.	[Through a supplier]	[Major]	Company	Electricity, gas, heat and water	Nagano, Nagano	231	–	1	2026-08-15