If you have been suffering from Google redirections, there is a high possibility that you are infected with Cycbot or one of its versions (Cycbot.b or Win32/Cycbot.B). Note that Cycbot is a dangerous trojan horse that belongs to the backdoors category. It is used not only to open the backdoors of the system and let its owner to get a remote control over its target computer but may also be a tool helping for the scammer to download fake antivirus on it. However, the main reason of creating and distributing Cycbot trojan is Google search redirections. Note that this virus is also capable to hijack other search engines as well and redirect your Yahoo/Bing or other browser sessions to harmful websites.
As soon as you get infected with Cycbot, this trojan creates a trustworthy-looking file to hide under. It may hide under dwm.exe, svchost.exe and other files that seem to be safe and vital for normal computer's functionality. In addition, it starts following its owner's commands and tracks victim's activity on the Internet, opens the backdoors of the system, downloads and installs malware files and does other stuff. The most obvious sign of having this trojan on board is Google redirections to insecure websites and annoying pop-up ads.
If you have also been suffering from Cycbot, don't waste your time on dealing with this virus because it may cause serious problems for you and your computer. You should simply check your computer with reputable anti-spyware program and remove infected items from it. More information can be found on this post:http://www.2-spyware.com/remove-cycbot-trojan.html