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The Blaster Worm (also known as Lovsan, Lovesan or MSBlast) was a computer worm that spread on computers running the Microsoft operating systems Windows XP and Windows 2000, during August 2003. The worm was first noticed and started spreading on August 11, 2003. The rate that it spread increased until the number of infections peaked on August 13, 2003. Once a network (such as a company or university) was infected, it spread quicker within the network because firewalls typically did not prevent internal machines from using a certain port. Filtering by ISPs and widespread publicity about the worm curbed the spread of Blaster. On March 12, 2004, Jeffrey Lee Parson, an 18-year-old from Hopkins, Minnesota, was arrested for creating the B variant of the Blaster worm; he admitted responsibility and was sentenced to an 18-month prison term in January 2005. == Creation and effects == According to court papers, the original Blaster was created after security researchers from the Chinese group Xfocus reverse engineered the original Microsoft patch that allowed for execution of the attack. The worm spread by exploiting a buffer overflow discovered by the Polish security research group Last Stage of Delirium in the DCOM RPC service on the affected operating systems, for which a patch had been released one month earlier in (MS03-026 ) and later in (MS03-039 ). This allowed the worm to spread without users opening attachments simply by spamming itself to large numbers of random IP addresses. Four versions have been detected in the wild. These are the most well known exploits of the original flaw in RPC, but there were in fact another 12 different vulnerabilities which never saw very much media attention. The worm was programmed to start a SYN flood against port 80 of windowsupdate.com if the system date is after August 15 and before December 31st and after the 15th day of other months, thereby creating a distributed denial of service attack (DDoS) against the site.〔(【引用サイトリンク】title=W32.Blaster.Worm : Technical details )〕 The damage to Microsoft was minimal as the site targeted was windowsupdate.com, rather than windowsupdate.microsoft.com to which the former was redirected. Microsoft temporarily shut down the targeted site to minimize potential effects from the worm. The worm's executable, MSBlast.exe, contains two messages. The first reads:
This message gave the worm the alternative name of Lovesan. The second reads:
This is a message to Bill Gates, the co-founder of Microsoft and the target of the worm. The worm also creates the following registry entry so that it is launched every time Windows starts:
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