[jorgesborges]

Are most machines involved in attacks like this compromised? Are we talking generic consumer desktop machines, like my grandma’s old XP desktop running in her basement?

[IceWreck]

> Are most machines involved in attacks like this compromised?

Yes

> Are we talking generic consumer desktop machines, like my grandma’s old XP desktop running in her basement?

Those combined with hundreds of thousands of compromised VPSes, etc.

[bombcar]

And don’t forget the millions of IoT devices.