It seems that attackers have designed this digital worm with a great care so that it wouldn't hit those computers and networks that do not meet specific configurations. According to some security experts, it is also set to apply some self protection tips, like easing itself on June 24 2012 and similar. The way how targets get infected with Stuxnet is really unprecedented - this virus has already used four zero-day vulnerabilities. In addition, this half a megabyte in size virus can also infect system through the removable drives, such as USB drive or similar.