How does a virus like Security Tool get on our pc?

Yes, criminals DO this deliberately....to sell useless software to fix the problem. Or even worse to steal your personal or financial information.

Did you know that stolen credit card numbers are (pretty much) openly sold in the bowels of the Internet?

Computer virus (properly called malware) is a huge multi-billon dollar business worldwide. Just like everything else in life, "It's all about the money".

This sort of malware is often coded in the former colonies of the old USSR. Recently re-minted countries like Ukraine, Latvia, and Estonia etc. Then the "baddies" are often hosted on Chinese servers, making any kind of law-enforcement mostly impossible.

It has nothing to do with vandalism or people being "cruel" for fun.

As they said once-upon-a-time on Hill ST Blues...."hey, lets be careful out there"

The internet is simply a reflection of real-life....just as in real-life it has more than it's fair share of thieves, charlatans, and con-men!

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Thre are hundreds of thousends Downloader Trojans over the internet. When your pc is infected bya downloader trojan, that trojan will contact the remote server. and the program will tell the trojan to download the latest malicious software on the infected computer. Security Tool is a rogue spyware fake program (malicious software). and it comes to your computer by downloader trojans under hidden mode so you don`t know when and how it came.

for more informaion and removal instructions to remove Security Tool, folloe the link

http://darfuns.com/spyware-removal/security-tool-v...

There are suspicious websites that will load a trojan after visiting them. Trojans will download and install Security Tool.

They don't write programs to be cruel. They write them to scam people out of money. Billions of dollars a year are made by these scams.

You download it off of the internet and then it gets on your computer (often disguised as other software, or through scare tactics like popup ads).

Of course people make it, where else would it come from?

User usually allows it to enter...