You have probably heard of the recent MSBlaster worm which infected about 124,000 computers within hours of being released on the Internet, despite firewalls and anti-virus software being in place for most companies, this caused havoc on many companies networks. The recent "Slammer" worm took 10 minutes to spread world-wide. In fact, 2000 new viruses come out every month!
The reported damage estimate from the "LoveLetter" virus was as much as $10 Billion and Wavex wrote the first fix . (ICSA.Net)
After significant analysis, the Cooperative Association for Internet Data Analysis (CAIDA) found that the "Code Red" worm affected more than 359,000 servers in less than 14 hours. They also determined:
"At the peak of the infection frenzy, more than 2,000 new hosts were infected each minute."
"43% of all infected hosts were in the United States"
"11% originated in Korea"
"5% of [the infected hosts] were in China, and 4% in Taiwan"
As a result of these continuing threats, Wavex believes it is important to determine whether client machines are infected with dormant viruses or exposed to potential future threats. This will involve checking inbound/outbound traffic policies, checking PCs/Servers have virus defense and the appropriate virus updates are being applied.