Cyber Incident Victim: 株式会社ホスピタルサービス
Date:
May 2025
Location:
Japan
Summary
Hospital Service Co. experienced unauthorized external access resulting in ransomware infection on its network. The company promptly implemented containment measures, including isolating affected servers and disrupting network segments to prevent further spread. An external expert-assisted response team is actively investigating the incident and working on restoration. While ordering systems and logistics operations are gradually recovering, the investigation into potential personal information compromise continues with no confirmed data breach identified thus far.
| CIA Posture | Motives | Tactics, Techniques & Procedures |
|---|---|---|
| Available to members | 0 motives | 1 technique |
| Threat Actors | Type | Location |
|---|---|---|
| 0 actors | Available to members | Available to members |
Description
On May 15, 2025, 株式会社ホスピタルサービス detected unauthorized external access to its network that resulted in ransomware infection of its servers. The company identified the compromise on the same day and immediately implemented containment measures to prevent further damage, followed by a public disclosure of the incident. By May 22, 2025, the company established a dedicated response headquarters and continued working with external cybersecurity experts to expedite recovery efforts. Critical containment actions included isolating affected servers from the network and disconnecting compromised systems to halt the attack's spread. These measures caused operational disruptions, particularly impacting order processing and logistics systems, though the company reported gradual progress in restoring these functions.
The organization maintained ongoing investigations into potential data exposure but confirmed no evidence of personal information leakage as of May 22. All forensic activities were conducted in coordination with external specialists, with regular updates provided to law enforcement agencies. Business operations continued under restricted network conditions while recovery work progressed. The company committed to disclosing additional confirmed findings promptly but had not released further technical details regarding the ransomware variant, initial attack vector, or full scope of compromised systems beyond the acknowledged server infiltration. No ransomware group claimed responsibility or published stolen data in available reporting periods.