How do I check the digital signature?

FixBlast.exe is digitally signed. Symantec recommends that you only use copies of FixBlast.exe that have been directly downloaded from the Symantec Security Response Web site. To check the authenticity of the digital signature, use the following steps.

  1. Visit the following Web site: http://www.wmsoftware.com/free.htm

  2. Download and save the Chktrust.exe file to the same location where you saved the FixBlast.exe (for example, the C:\Downloads folder or the Windows Desktop).

  3. Depending on your operating system, use one of the following steps:

    • For Windows 2000, from the Start menu, point to Programs, and then click MS-DOS Prompt.
    • For Windows XP, from the Start menu, point to Programs, Accessories, and then click Command Prompt.

  4. At the command prompt, change to the folder where FixBlast.exe and Chktrust.exe are stored. Press the ENTER key.

  5. At the command prompt, type: chktrust -i FixBlast.exe. Press ENTER.

    For example, if you saved the files to the C:\Downloads folder, you would type the following commands:

    cd\
    cd Downloads
    chktrust -i FixBlast.exe

    Press the ENTER key after typing each command.

  6. If the digital signature is valid, you will see the following message: "Do you want to install and run "W32.Blaster.Worm Removal Tool" signed on 8/11/2003 7:14 PM and distributed by Symantec Corporation?"

    Note: The date and time displayed in this message are adjusted to your time zone if your computer is not set to the Pacific time zone. If you are on Daylight Savings time, the displayed time is exactly one hour earlier.

  7. If this message does not appear, there are two possible reasons:

    • The tool is not from Symantec. Unless you are sure that the tool is legitimate and that you downloaded it from the legitimate Symantec Web site, do not run it.
    • The tool is from Symantec and is legitimate, however your operating system was previously set to always trust content from Symantec. For information on this and how to view the confirmation dialog again, read the document "How to restore the Publisher Authenticity confirmation dialog box."

  8. Click Yes to close the dialog box.

  9. Type: Exit, and then press ENTER. This close the MS-DOS prompt.