Rintatsu: its server was accessed without authorization, and it stopped PCs and the network because of a ransomware risk

In the early morning it recognized suspected unauthorized access to its server from outside. It set up a special response team with outside experts, stopped the affected servers and PCs and cut the network. It reported to the police. [1]

It confirmed a ransomware risk, and that the effect was limited to certain servers. [1]

It announced the case. It is restarting servers and PCs that have been confirmed safe and resuming communication in turn. [1]

It announced that servers were restored and normal operations resumed. It confirmed encryption by ransomware but found no trace of a leak. [2]