Adware.Grambler is Malwarebytes' detection name for a specific program called Gramblr that displays advertisements on the affected system. Newer versions of the same software no longer show this behavior, but the installer is a bundler.
Bundles containing Adware.Grambler can be downloaded from several sites that specialize in this type of bundled software. The program Gramblr is advertized as an Instagram uploader.
Users may see this type of screens during the installation process:
and this entry in the list of installed Programs and Features:
Since later versions of this program are not detected, removal may be incomplete. It is advisable to use the regular uninstall routine to remove the program and use Malwarebytes to check for (potentially) unwanted guests.
The bundler that is available on gramblr.com is detected as:
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