The biggest issue facing cybercrime fighters at the moment was the fact that it was borderless, he told the BBC.
"Criminals no longer come to our countries, they commit their crimes from a distance and because of this I cannot use the normal tools to catch them.
"I have to work with countries I am not used to working with and that scares me a bit," he said
The majority of the cybercrime "kingpins" were located in the Russian-speaking world, he said.
Relationships with Russian law enforcers have not always been good but were "improving". He revealed that he had recently been on a trip to Moscow to discuss four big cybercrime cases and was hopeful that arrests and jail sentences would follow.
Mr Oerting described how Russian-speaking criminal gangs were creating and testing malware and then selling it as a service in online forums.
"Then it is downloaded by all kinds of criminals, from Eastern Europe, Europe, Africa and America," he said.
This commercialisation of cybercrime is making his job harder.
"It is so easy to be a cybercriminal. You don't have to be a cyber-expert because you just download the programs that you want to use."