Botnets are networks of hijacked computers that can be controlled remotely without the computer's owner knowing about it.
The Aisuru botnet consisted of several million compromised online devices, such as routers and webcams, according to a statement from police and prosecutors.
The second, the associated Kimwolf botnet, consisted of several million infected devices.
Correction: An earlier version of the text provided an incorrect definition of botnets.
