![]() ![]() They can be found in %USERPROFILE%\AppData\Roaming\Microsoft\Windows\SendTo. The following extensions are used by items in the Send To context menu. Although the arrow in the bottom left marks it as a Shortcut, it is likely many users would still click on it. A malicious attacker could send an unsuspecting user to a site laced with browser exploits, malware or other undesirable content. ![]() HKEY_CLASSES_ROOT\Application.Reference\shellex\ContextMenuHandlers\]ĭouble clicking on readme.txt brings up the NCC Group home page. HKEY_CLASSES_ROOT\Application.Reference\shellex\ContextMenuHandlers HKEY_CLASSES_ROOT\Application.Reference\shellex (Default) REG_SZ rundll32.exe dfshim.dll,ShOpenVerbShortcut %1|%2 HKEY_CLASSES_ROOT\Application.Reference\shell\open\command ![]() HKEY_CLASSES_ROOT\Application.Reference\shell\open Here’s the output for the key associated with the .appref-ms extension: C:\>reg query HKCR\Application.Reference /s The registry gives us this information too. The first step is to determine how files with each extension are handled. The interesting question from a security perspective is whether the fact that the extensions above are always hidden could be abused by malware to trick users into opening apparently benign content. Deskconnect valuation software#The list obviously depends on operating system version and what software is installed, so it is highly likely running the tool on different machines would give a different list. Deskconnect valuation windows 7#Running it on my Windows 7 machine gave the following list. I wrote a simple tool to implement this process. Read the default value for each one to get the underlying object type.Get a list of extensions from HKEY_CLASSES_ROOT.Finding all hidden extensionsĮnumerating all extensions with this property is now straightforward. The .mag extension is now visible, so we have confirmed the NeverShowExt value controls which extensions are always hidden. We can check by deleting that value, restarting Explorer, and seeing what the directory looks like. The NeverShowExt value looks suspiciously like what we’re looking for. (Default) REG_SZ Microsoft Access Diagram Shortcut So a .mag file extension indicates an .1 type of object. You can use regedit or the command line equivalent, reg. What is it about .mag that means Explorer doesn’t show it? A good place to start digging is the Registry key concerning the extension. The following sections consider these individually. Why are files with this extension hidden?. Deskconnect valuation code#If there are extensions that allow code to be run that are always hidden, then these attacks become more likely. Another trick was to put lots of spaces before the .exe so it would not be seen in the visible part of the UI. A file that appears to be called readme.txt might actually be , or family.jpg that appears to be a picture could. A trick that malware has used for many years involves taking advantage of the fact that by default, Windows hides many common file extensions. ![]()
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