Plus, among the predefined types of objects that the ATL COM Wizard natively supports, there's one, the Internet Explorer Object, that is just the type of object a BHO should be.

另外，在ATL COM 向导本地支持的已定义好的对象类型当中，有一个，就是Internet Explorer对象，这正是一个BHO应该具有的类型。

youdao

"The initial program installed itself as a browser helper object (BHO) for Internet Explorer that downloaded a component from childhe.com and attempted to trick the victim into installing a fake anti-virus scanner from bestantispyware securityscan.com and protectionsoft warecheck.com, " he explained.

BBC: Hackers website