Internet Explore Warning!

As of 4/1/19 having Internet Explorer on your computer can cause security issues. This applies to:

Windows Server 2019 Windows 10 1803 (tbd, codename RS4) Windows 10 1709 (Fall Creators update, codename RS3) Windows 10 1703 (Creators update, codename RS2) Windows 10 1607 (Anniversary update, codename RS1) / Windows Server 2016 Windows 10 1511 (November update, codename TH2) Windows 10 1507 (RTM, codename TH1) Windows 8.1/Windows 2012 R2 Windows 8/Windows 2012 Windows 7 SP1/Windows 2008 R2 SP1 Windows Vista/Windows 2008.

Until Microsoft issues a patch ( that they seem reluctant to do) It is best to let another browser handle Mht files. You can do this by going to control panel/ Default Programs and scroll down the page (Windows 10) and select “Choose default apps by file type”. Scroll down the left side to .MHT, click on Internet Explorer icon on the right and choose another browser.

The problem is a weakness that exploits the way a browser handles MHTML (MHT) files. This is IE’s default web page archiving format. It  allows the remote attacker to steal local files and conduct remote spying on locally installed information.

04/19/19 UPDATE:

Windows 10, IE and MHT files Here’s an easy way to disassociate Internet Explorer from MHT in Win10:

Step 1: Make sure filename extensions are showing. Click on File Explorer (the icon at the bottom that looks like a file folder), then at the top click View. Make sure the box marked File name extensions is checked.

Step 2: Right-click an empty spot on your desktop and choose File > New > Rich Text Format (actually, any kind of file will work). Windows puts a new file of that type on your desktop, with the name already highlighted so you can change it.

Step 3: Rename the file to wow.mht or anythingelse.mht. Make sure you’ve deleted all of the old filename, including the part to the right of the period. Hit enter. Windows will nag you about changing file name extensions. Click Yes, thank you, Mother Microsoft.

Step 4: Right-click on the newly created mht file and click Open with….

Step 5: Click More apps, then Notepad (or some equally innocuous program), check the box marked Always use the app to open .mht files, and click OK.

Step 6: Test to make sure you’ve subverted MHT files by double-clicking on your desktop MHT file. From that point on, any MHT file will open in Notepad – and the infection cycle has been broken.

Windows 7 and 8.1

The process is more straightforward in Win7 and 8.1. Here’s how: Step 1: Click Start > Control Panel > Programs and under Default Programs click Make a file type always open in a specific program. Step 2: On the left, scroll down to .mht. See how it’s associated with Internet Explorer? Click on mht and click Change program… Windows shows you a pane that’s marked Open with. Step 3. On the lower right, click Browse, navigate to c:\Windows\System32, scroll way down, click on Notepad.exe and click Open. Click OK.

The process is more straightforward in Win7 and 8.1.

Step 1: Click Start > Control Panel > Programs and under Default Programs click Make a file type always open in a specific program.

Step 2: On the left, scroll down to .mht. See how it’s associated with Internet Explorer? Click on mht and click Change program… Windows shows you a pane that’s marked Open with.

Step 3. On the lower right, click Browse, navigate to c:\Windows\System32, scroll way down, click on Notepad.exe and click Open. Click OK.

One Response to “Internet Explore Warning!”

  1. Bibi Berezny says:

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