See it like stealing from a museum: very easy to break in (weak password -> breaking a window), hard to get out of here with all the paintings unnoticed - and t

See it like stealing from a museum: very easy to break in (weak password -> breaking a window), hard to get out of here with all the paintings unnoticed - and that, on a daily basis. The amount of effort and different techniques they've put in to remain undetected for months (years?) while infecting a lot of actors is pretty impressive.