SoftBank IDCF Cloud Ransomware Attack Exposed by Hackers
ID: aaaa4511-8b6a-5f45-87b0-a29c46295f1f
STIX ID: report--aaaa4511-8b6a-5f45-87b0-a29c46295f1f
Feed Name: securityonline.info
On October 7, 2026, IDCF (part of SoftBank Group) suffered a ransomware attack that corrupted four critical partitions and caused partial virtual server outages impacting about 495 corporate and local government customers. Attackers with deep internal privileges placed 225 ransom notes in root directories, observed seven hours of failed recovery attempts by engineers, and ultimately published the ransom note on IDCF’s official website after the company failed to notify customers and closed support tickets without resolving the outage.
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