
I know the image above may be misleading, because we'll be talking about a product related to MacScan, but not MacScan itself, but this was the best image matching the topic, and here's why...
Usually, antivirus companies release free tools that are able to eliminate single threats, or a reduced number of viruses from the same family, and SecureMac, MacScan's producer, did exactly the same thing by releasing DNSChanger Removal Tool.
This small freeware program has only one purpose - to detect and eliminate from your Mac what seems to be the latest spyware for this platform, known as OSX.RSPlug.A Trojan Horse, or simply the DNSChanger Trojan.
Rated as a highly dangerous threat, this spyware changes your DNS records and redirects your Internet traffic to various malitious sites that can infect you with even more viruses, as well as to pornographic sites.
To see if your computer is clean, all you have to do is download DNSChanger Removal Tool from here and perform a quick scan. Good luck!