Microsoft Update - 0% Detection Rate *

Did you just find a download or a file on your computer that has been digitally signed by Microsoft Update? If so, please read on.

You'll probably notice Microsoft Update when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screengrab shows:

You can view the additional details from the Microsoft Update digital signature with the following procedure:

1. Open Windows Explorer and locate the Microsoft Update file
2. Right-click on the file and select Properties
3. Click the Digital Signatures tab
4. Click on the View Certificate button

Here is a screenshot of a file digitally signed by Microsoft Update:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This implies that the file has been published by Microsoft Update and that the file has not been tampered with.

If you click the View Certificate button shown in the screengrab above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also see the address for Microsoft Update, such as the street name, city and country.

Microsoft Update Signing CA 1.1 and Microsoft Update Signing CA 2.1 has issued the Microsoft Update certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screencap above.

Microsoft Update Files

These are the Microsoft Update files I've collected, thanks to the FreeFixer users.

* How the Detection Percentage is Calculated

The detection percentage is based on that I've collected 182 scan results for the Microsoft Update files. 0 of these scan reports came up with some sort of detection. If you like, you can view the full details of the scan results by examining the files listed above.

Analysis Details

The analysis is based on certificates with the following serial numbers:

• 33000000089fe2e3d3a694cfa4000000000008
• 330000001ef31020becea7b90200000000001e
• 3300000030bb21ae45d87f35e4000000000030

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