The timing and scale of the attacks suggest the Russians may be looking for the same kind of damaging information on Joe Biden that President Trump wanted from Ukraine, security experts say.
www.nytimes.com
It is not yet clear what the hackers found, or precisely what they were searching for. But the experts say the timing and scale of the attacks suggest that the Russians could be searching for potentially embarrassing material on the Bidens — the same kind of information that Mr. Trump wanted from Ukraine when he pressed for an investigation of the Bidens and Burisma, setting off a chain of events that led to his impeachment.
(bolding mine)
... or what they were planting.
According to a security expert, the "fingerprints" on the Burisma attack were exactly the same as those on the DNC hack, and point straight to the GRU. They didn't even bother to disguise themselves. So not only were they searching for (or planting) evidence, they were giving a great big "nyah-nyah-nyaaaaahhh" to Western intelligence, knowing that Barr/Trump - or "Barrump" - will short-circuit any possible investigation. Facepalm!
But..Hey!...I mean, it could be Russia, but it could also be China. It could also be lots of other people. It also could be somebody sitting on their bed that weighs 400 pounds, OK? You don’t know who broke in to Burisma