W32/Blaster.A

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W32/Blaster.A Destructivity: Spreading: Overall risk:
  
• Detected by virus detection files published: 8/12/2003 • Type: Worm
• Virus characteristics first published: 8/12/2003 • Spreading mechanism: Network
• Virus characteristics latest update: 9/20/2005 • Overall risk: Medium
• Alias: MSBlast.A • Payload: Performs a denial of service attack
• Infection type: Microsoft Windows 95/98/98 SE/ME/NT 4/2000/XP/2003/Vista  

Virus type Spreading
mechanism 		Destructivity
and payload 		Additional
descriptions 		Detection
and removal
The worm checks the time on the infected computer. If the date is the 16th or higher of any month; or if the date is lower than 16th, but month is higher than August, the worm will initiate an attack on Windowsupdate.com, sending a lot of packets on port 80.
This attack takes place in a separate thread; the worm's original infection routine is still running as well.
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