The yearly reported number for 2010 was 13,912: decreased 15.1 percent from 16,392 in 2009. This reported number has gradually been decreasing year by year as a virus that massively distributes a virus-contaminated e-mail to causes a large-scale infection has not existed in the past several years.

Figure1-1: Virus Report Count for Each Year

Number of viruses reported was 101 (2009: 125): of which 5 viruses were reported to IPA for the first time in 2010 (2009: 9).

Of the viruses reported, W32/Netsky was most frequently detected, followed by W32/Mydoom and W32/Mum. Since 2004, W32/Netsky has most frequently been reported every year and its detection count is taking a large proportion of the total detection count. As for W32/Mydoom, its detection count remained at the same level.

Among those that marked a relatively-high detection count in a short period of time were: W32/Mumu (from January to March), W32/Waledac (in January and August), W32/Koobface (in May) and W32/Autorun (in July), etc.

Figure2-1: Detection Count by Virus

When we look at the detection count by virus, we can see that a large number of reports concerning W32/Netsky, W32/Mydoom and W32/Autorun have been submitted to IPA. While overall report counts have been on the decrease, W32/Netsky continues to be flat (See Figure 2-2).

Figure2-2: Report Count by Virus

Information-Technology Promotion Agency, Security Center
Tel:+81-3-5978-7591
Fax:+81-3-5978-7518
E-mail: