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How to combine multiple Extra.DAT files
Technical Articles ID:   KB68061
Last Modified:  5/12/2015


McAfee Labs
McAfee Extra.DAT files
McAfee ServicePortal
McAfee Platinum Portal


An Extra.DAT file is a temporary detection signature that is provided by McAfee Labs for malware that is not detected in the regular .DAT files. These signatures are usually distributed after submission and testing of infected files that were not properly detected or cleaned.

Only a single Extra.DAT can be used at any given time. In some cases, you may need to combine several Extra.DAT files to defend against multiple new threats. You can upload multiple Extra.DAT files and combine them into a single signature file through the ServicePortal or Platinum Portal.

To combine Extra.DAT files
NOTE: You can combine a negative Extra.DAT and a positive Extra.DAT. However, this will not work if both are for the same driver because they will cancel each other out. 

  1. Log on to the ServicePortal at https://support.mcafee.com.
  2. Click the Tools tab, and then click Combine Extra.DAT Files.
  3. Click Browse and navigate to the location of your Extra.DAT files.
  4. Select a file and click Upload.
  5. Repeat this process for the other files you want to combine.

    NOTE: You can combine up to five Extra.DAT files with this utility.
  6. After you have uploaded all the necessary Extra.DAT files, click Combine.
  7. Click Save and browse to the folder where the combined Extra.DAT file will be stored.

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