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Your mileage may vary.Windows Defender Antivirus Definition Updates for timely updating of your Windows Defender if the automatic update happens to fail.

We found it easiest to just change directories to C:\ProgramData\Microsoft\Windows Defender\platform\.9-0\ and then proceed from there. "" is where you want the file to go, and you have to include the filename there as well: "C:\Users\You\Downloads\foobar.txt". "" is the URL you're downloading from, and it has to include the filename you want, such as "." But make sure you know what you're doing:Ĭ:\ProgramData\Microsoft\Windows Defender\platform\.9-0\MpCmdRun.exe -DownloadFile -URL -path If you're wondering how to do this, here's the filepath and commands. You can try this at home (but most people shouldn’t) We've reached out to Microsoft for comment and will update this story when we receive a reply. And of course Windows Defender is still present on every Windows 10 PC, whether or not you use third-party antivirus software. So in those respects, the Windows Defender download tool can't be used to do anything worse than any malware that successfully infected your system could normally be permitted to do, such as downloading a file through a web browser.īut there's always stuff that AV software won't detect. We don't use Windows Defender ourselves as our default antivirus software, but Windows Defender would almost certainly have also spotted and defanged the EICAR test file as well. In other words, malware can't use it to easily seize system control.Īlso, our Bitdefender antivirus software spotted and quarantined the EICAR test file right away every time. That conforms to the Windows user parameters and indicates that this Windows Defender download tool can't be used to escalate privileges.

We were not able to download the EICAR test file to another user's download folder or to directories to which we weren't entitled to write to or hadn't created ourselves - even when logged in as an administrator. This means that any piece of decently functioning malware that infects even a limited-user account will be able to use Windows Defender itself to download any file from the internet. These programs detect malicious files downloaded to the system through the antivirus file download feature."Ī Microsoft spokesperson clarified that the statement also applies to Windows Defender Antivirus, the antivirus software that comes bundled into Windows 10 Home.

"Despite these reports, Microsoft Defender antivirus and Microsoft Defender ATP will still protect customers from malware. Microsoft responded to our request for comment with this statement, in full: (Image credit: Future) Microsoft responds