- Account hops: the first X accounts are hacked and they bounce the transfer between each other, at some point the transfer gets out to a Nameless account. You know the transfer is made there but you know who's actually the owner. By the time you get the permission to investigate is too late. money are gone. And possibly the original identify was stolen as well.
- Dividi and Impera: you get the payment on one account, than you split between N, where N is small enough to be an hard to track transaction. Later on they merge again.
- Untraceable currency. You get the money in a "standard" currency, and then using the bank as a broker you buy a untraceable currency, let's say bitcoin. At that point, there is no way to track back.
As for any other strategy, you still need an hacked account, or an account with fake identity related. As it is in 2014, there are few countries in the world where is easy to obtain one.
Along with the money, the enterprises issue a payslip, with a duplicate sent to the IRS, and then the IRS falls down on the poor hacker and taxes this income.
As for crackers, I don't have any idea how they do it.