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W32 Blaster Worm Virus

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Microsoft Insider


"At 11:34 A.M. Pacific Time on August 11, Microsoft began investigating a worm reported by Microsoft Product Support Services (PSS). A new worm commonly known as W32.Blaster.Worm has been identified that exploits the vulnerability that was addressed by Microsoft Security Bulletin MS03-026. Who Is Vulnerable?
Users of the following products are vulnerable to infection by this worm:
  • Microsoft® Windows NT® 4.0
  • Microsoft Windows® 2000
  • Microsoft Windows XP
  • Microsoft Windows Server(TM) 2003

Your computer is not vulnerable to the Blaster worm if either of these conditions apply to you:
  • If you are using Microsoft Windows 95; Windows 98; Windows 98 Second Edition (SE); or Windows Millennium (Me).
  • If you downloaded and installed security update MS03-026 prior to August 11, the date the worm was discovered.

4 Steps for Home Users
If you are using Windows NT 4.0, Windows 2000, Windows XP, or Windows Server 2003, you should follow the steps in this sequence to help protect your system and to recover if your system has been infected.

1. Enable a Firewall: Make sure you have a firewall activated to help protect your computer against infection before you take other steps. If your computer has been infected, activating firewall software will help limit the effects of the worm on your computer.

The latest Windows operating systems have a firewall built in. Windows XP and Windows Server 2003 users should print or save the following instructions for how to enable their firewall.

If your computer is rebooting repeatedly, disconnect from the Internet before you enable your firewall. To disconnect your computer from the Internet:

  • Broadband connection users: Locate the cable that runs from your external DSL or cable modem to the wall and unplug that cable either from the modem or from the telephone jack.
  • Dial-up connection users: Locate the telephone cable that runs from the modem inside your computer to your telephone jack and unplug that cable either from the telephone jack or from your computer.


Follow the instructions provided for your operating system, and then reconnect to the Internet.


  1. ZoneAlarm Pro (Zone Labs): http://go.microsoft.com/?linkid=221047

  2. Tiny Personal Firewall (Tiny Software): http://go.microsoft.com/?linkid=221048

  3. Outpost Firewall (Agnitum): http://go.microsoft.com/?linkid=221049

  4. Kerio Personal Firewall (Kerio Technologies): http://go.microsoft.com/?linkid=221050

  5. BlackICE PC Protection (Internet Security Systems): http://go.microsoft.com/?linkid=221051


Windows 2000 users: Alternatively, you can take steps to block the affected ports so that your computer can be patched. Here are some modified instructions from the TechNet article HOW TO: Configure TCP/IP Filtering in Windows 2000: http://go.microsoft.com/?linkid=221052.

2. Update Windows: If you are disconnected from the Internet, remember to reconnect before you take the next steps. Download and install the security update addressed in Security Bulletin MS03-026 for the version of Windows that you are using from the Microsoft Download Center.


3. Use Antivirus Software: Make sure you have the latest updates installed.