We know that Paul Manafort lives at Trump Tower, he has his business there, and a computer and he did work in the Ukraine before Candidate Trump hired him to be the Campaign head during the National Election, then Trump let him go after he won the Election...
Manafort goes all over the world in his business, so maybe they picked up some of Manafort’s server activity since it's in the same building...???
There are probably hundreds of computers in the building, and some may very well have malware and stuff on them. Are all the computers in residences/businesses in the tower on the same local network (i.e. share the same external IP address), or are only some on a shared network... or do they all have their own connection to the Internet?
I have more questions than answers at this point... and none in the media are asking even the most basic questions... intentionally most likely.