Blaster (computer worm)
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. Filtering by ISPs and widespread publicity about the worm curbed the spread of Blaster.
On August 29, 2003, 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.
The worm was programmed to start a SYN flood against port 80 of windowsupdate.com if the system date is after August 15th and before December 31st and after the 15th day of other months, thereby creating a distributed denial of service attack (DDoS) against the site. The damage to Microsoft was minimal as the site targeted was windowsupdate.com instead of windowsupdate.microsoft.com to which it was redirected. Microsoft temporarily shut down the targeted site to minimize potential effects from the worm.
The worm's executable contains two messages. The first:
I just want to say LOVE YOU SAN!!soo much
Which is why the worm is sometimes called the Lovesan worm. The second:
Billy Gates why do you make this possible ? Stop making money
and fix your software!!
The worm also creates the following registry entry so that it is launched every time Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\windows auto update=msblast.exe
Side effects 
Although the worm can only spread on systems running Windows 2000 or Windows XP (32 bit) it can cause instability in the RPC service on systems running Windows NT, Windows XP (64 bit), and Windows Server 2003. In particular, the worm does not spread in Windows Server 2003 because Windows Server 2003 was compiled with the /GS switch, which detected the buffer overflow and shut the RPCSS process down.When infection occurs, buffer overflow makes RPC service crash, leading Windows to display the following message and then automatically reboot, usually after 60 seconds. (default RPC service failure behaviour) 
This system is shutting down. Please save all work in progress and log off. Any unsaved changes will be lost. This shutdown was initiated by NT AUTHORITY\SYSTEM
Time before shutdown: hh:mm:ss
Windows must now restart because the Remote Procedure Call (RPC) Service terminated unexpectedly.
This was the first indication many users had an infection; it often occurred a few minutes after every startup on compromised machines. A simple resolution to stop countdown is to run the "shutdown -a" command in the Windows command line, causing some side effects such as an empty (without users) Welcome Screen. The Welchia worm had a similar effect. No more than a year later, the Sasser worm surfaced, which caused a similar message to appear.
See also 
- Helpful worm
- List of convicted computer criminals
- Timeline of notable computer viruses and worms
- "CERT Advisory CA-2003-20 W32/Blaster worm". Cert.org. Retrieved 2010-09-23.
- "Blaster worm author gets jail time". infoworld. 28 January 2005. Retrieved 23 August 2008. "An 18-month prison sentence is probably the best that Jeffrey Parson could have realistically hoped for. The U.S. authorities have demonstrated their determination to deal with virus writers and other cybercriminals," said Graham Cluley, senior technology consultant for security software company Sophos"
- Iain Thomson. "FBI arrests 'stupid' Blaster.B suspect - V3.co.uk - formerly". vnunet.com. Retrieved 2010-09-23.
- "MSBlast W32.Blaster.Worm / LovSan :: removal instructions". Able2know.org. 2003-08-12. Retrieved 2010-09-23.
- "W32.Blaster.Worm". Symantec. Retrieved 2010-09-23.
- "W32.Blaster.Worm : Technical details". symantec.com. December 9, 2003.
- "Why Blaster did not infect Windows Server 2003 - Michael Howard's Web Log - Site Home - MSDN Blogs". Blogs.msdn.com. 2004-05-26. Retrieved 2010-09-23.
- "Blaster technical details - Trend Micro Threat Encyclopedia". Trendmicro.com. Retrieved 2011-03-25.
- "Blaster Worm-Virus or Its Variants Cause the Computer to Shutdown with an NT AUTHORITY\SYSTEM Error Message Regarding Remote Procedure Call (RPC) Service". HP Customer Care.
- "What is the Blaster Worm". Techopedia. Retrieved 14 February 2013.