Kellermann analyzes the patterns of malware from the two geographies and concludes East European hackers lean towards custom-built, highly complex malware; East Asian hackers use more off-the-shelf malware and simpler techniques.
It’s an insightful argument and the original paper should be read by IT security staff. However, the bottom line is no matter where malware comes from, be prepared.
The bot threat
Some of the most serious threats networks face today are "bots," remotely controlled robotic programs that strike in many different ways and deliver destructive payloads, self propagating to infect more and more systems and eventually forming a "botnet."