How to Remove WebMonBHO (WebMonBHO.dll and Baidu Toolbar)?

What is WebMonBHO exactly? It is an add-on on my IE11. I can't disable it (the Disable button is in grey). It installed itself recently (I didn't ask for it). The Publisher is Baidu (China) Co., Ltd. How to remove it?

What is WebMonBHO?

WebMonBHO is a potentially unwanted program that is installed within the context of Internet Explore as a BHO (Browser Helper Object) under the name ‘BDHOOK’. Signed by Baidu, it often comes with a lot of programs or software related Baidu. Commonly, WebMonBHO is often distributed via free downloads. If you install some infected software to your computer, you will get this PUP.