Are these ads familiar to you ?!
If yes, you might have "VSearch Mac Adware" also known as "Downlite" or "Conduit" installed on your Mac …
Recently, we have met this Adware many times on our customers Macs . Sometimes users have not even noticed that something went wrong …
This Adware changes your browser's homepage to its own web search results by adding a lot of advertising (as shown in the image above), brings popup windows to your desktop and prevent some settings from being saved under Safari.
Basically, there is a hidden program that runs in the background and changes the browser's traffic.
It will be installed when you try to watch TV or movies from unofficial sources. The most famous website to get it from is "PirateBay" … a famous Torrent site!
To install, the user must still enter a user name and password for administrator, so be careful when entering your administrator password.  Thomas Reed of "The Safe Mac" explains how to get rid of it:
Move the following items to the trash. Please note that removing many of these files requires administrator access so you must be sure that you are logged in to an account on your Mac. If you are not, you will not be able to remove any of them. Some of these files may not be present in all variants of this ad. If you do not know how to find a file based on the path below, read Find Files from Trails.
/ Library / Application Support / VSearch
/ Library / PrivilegedHelperTools / Jack
Once you have moved these items to the Recycle Bin, restart your computer. After you have restarted, you can empty the trash.
It's definitely not true! However, Mac OS X is much safer than Microsoft Windows. Apple also has 2 good built-in soft products to prevent Adware and Malware from being installed on Mac called "GateKeeper" and "XProtect". But as Apple's market grows, we must be prepared to see more like this …
So you wonder why could VSearch Mac Adware be installed since it's known as a malware?
Linc Davis on a thread on Apple Support Communities found the reason:
You may wonder why you did not get a Gatekeeper warning about installing software from an unknown developer as you should have. The reason is that the DownLite developer has a certificate issued by Apple, which allows Gatekeeper to give the installer a passport. Apple could revoke the certificate, but with this writing, it has not done it, even though it is familiar with the problem. This error in the audit is unpredictable and has compromised both the Gatekeeper and the Developer ID program. You can not rely on Gatekeeper alone to protect you from malicious software.
As shown in this post, you can follow some basic rules to protect your Mac from unwanted soft items.
Thomas Reed has joined Malwarebyte's team since 2015 to develop a very useful tool called Malwarebytes for Mac
It is a free software for home users but has a premium package that the free version does not include.
It has become a must software for Mac users and has helped many of our customers in Phuket.