We’ve been analyzing W32.Stuxnet, which is a threat that uses a legitimate digital certificate from a major third party and takes advantage of a previously unknown bug in Windows; ultimately, it searches for SCADA systems and design documents. The findings of our analysis are being documented in a series of blog articles.
"Within the past 72 hours we've seen close to 14,000 unique IP addresses infected with W32.Stuxnet attempt to contact the C&C server."
You can read the rest of this Blog here: W32.Stuxnet Network Information.