unidentified possible Trojan horse

I think that my computer is infected with some sort of Trojan. I bought this MacBook Air in October and it worked perfectly until today. I tried to read a Web site and page could not finish loading and it kept opening other tabs very suspicious. When I visited perfectly firefox regularly guarded site redirecting them to pages like this:

And there's always a pop up window asking me to download MacKeeper (I didn't download it!). The same thing happens when I use Safari.

I checked the Add-ons, and I don't know what could cause me (even if I don't know what these modules are Flash and Java). I read that Java can cause Trojans and I installed it recently. But it was earlier this week and I did not notice something different.

Then I not unhooked firefox and installed again, but nothing has changed. I googled and found that trojans and malware can be in the library, and then I found this:

What should I remove without damaging my brand new computer? One of them may be the Trojan horse that I'm looking for? Besides that I also found a local.cfg in Macintosh HD, is that suspicious?

I've updated to El Capitan earlier this week, and that's all right. A day earlier, I installed Adobe Illustrator and it required me to install Java, I don't like at all about Java. But as I said before this computer started showing this odd behavior today. Yesterday, I tried to download a pdf file from a Web site with a lot of pop ups, that could be the cause. But what can I do? I searched a lot of common trojans and found nothing.

I have a friend suggested that I should download Malwarebytes and run tests. But is it safe?

It's a scam jump upward. Do not call or click on anything either that it asks you. If you use Safari, force quit Safari then all by pressing and holding SHIFT restart Safari.

MalwareBytes is safe.

Tags: Mac OS & System Software

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