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rwp747
Level 7

MWG Anti-Malware changing file size


Hi Folks,

When downloading a file from the support.telco.com the Anti-Malware engine is changing the file size and breaking the file.  Here are two screen shots that show the download when using Anti-Malware and when bypassing Anti-Malware.  Any idea why?

bypassing GAM.JPG

traversing GAM.JPG

Thanks,

Randy

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2 Replies
McAfee Employee

Re: MWG Anti-Malware changing file size

Hi Randy!

This very likley has to do with MWG performing Progress Indication:

When MWG is performing "scanning" (Anti-Malware or other things), MWG will use progress indication to deliver the file to the browser. In doing so MWG may remove the Content-Length header in the response to the client, this way if there is a virus found, MWG is not on the hook to send the rest of the file.

Best Regards,

Jon

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McAfee Employee

Re: MWG Anti-Malware changing file size

I would suggest opening the broken file in a text editor, then scroll to the bottom of the file.

If you find an HTML block page, then it may have been blocked, but you didnt see the page due to data trickling.

Best Regards,

Jon

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