There are good hackers that will likely save our world from disaster.

Then there are bad hackers out there with various motives, often monetary. Some of them make a living or get a thrill by propagating viruses.

You will notice there are companies selling software to remove viruses, like the supposed DuckDuckGo virus, for example: http://www.2-spyware.com/remove-duckduckgo.html

There are virus creators out there that take the names of legitimate companies like DuckDuckGo and StartPage, likely to trick people for their own reasons.

Let me emphasize again that DuckDuckGo and StartPage are legitimate search engines, and the reported viruses that try to benefit from respected industry names like these have nothing to do with the legitimate search services.