IT Security Center

Yearly reported numbers for 2004 was 52,151 for which about tripled comparing with 17,425, reported numbers marked in previous year, 2003 and far to exceeded 50,000, the worst-ever reported numbers.

Case numbers actually infected to PC (actually damaged) tends to decrease from 20% taking over against whole figure marked in 2000; 8% in 2002 and in 2004, the actual damage withhold only 1%. It can be considered that increasing awareness about security countermeasures by installing anti-virus software, etc.

2. Reported Virus

Total reported virus numbers was 142 kinds (94 kinds in 2003) and initially reported virus in 2004 was 53 kinds (29 kinds in 2003). Of the mostly reported virus was W32/Netsky and W32/Bagle and W32/Mydoom followed.

Name of Virus	2004	2003	Exploits Mail Function	Exploits Security Holes
W32/Netsky	15,895	-	Yes	Yes
W32/Bagle	4,838	-	Yes	Yes
W32/Mydoom	4,388	-	Yes	Yes
W32/Klez	3,498	4,538	Yes	Yes
W32/Lovgate	2,569	165	Yes	Yes
W32/Swen	1,776	1,673	Yes	Yes
W32/Bugbear	1,727	1,602	Yes	Yes
W32/Mimail	1,629	883	Yes	Yes
W32/Zafi	1,557	-	Yes	Yes
VBS/Redlof	1,162	803	Yes	Yes
Other Viruses	13,112	7,761
Total	52,151	17,425

Note: Numbers above contain variants reported.

 Those viruses exploiting mail function and security holes are the viruses that likely to infect when mail body is displayed unless you open attachment file to e-mail.