Sirefef is a Trojan family that includes different types of parasites, which does different things. Every version has it’s own task, like one component opens all firewall blocks, another downloads malicious files and updates from the internet, then the other tries to hide them all from the system. Some other versions redirect web traffic generate pay-per-click traffic and show annoying pop ups.
It is very important to remove Trojan Sirefef from your computer, because it may not only use your computer and internet resources for illegal purposes, but it can also delete files on your system, find sensitive information, like passwords, financial information and send them to a remote server, where cybercriminals can use them. Additionally it may open a remote control connection to your PC.
If you will not remove Trojan Sirefef from your PC, it will continue to change your registry settings and other important windows files, which might cause your computer crash. Additionally, it will make your computer much slower, and you might find it difficult to browse the internet,
or use search engines, to find information.
Microsoft does not look enough to their paid results and Yahoo shows paid results from Bing. Guys at GFI labs cought Sirefef in their PPC results. If you would search for adobe flash player in Bing and Yahoo, you would get these results some time ago. They look innocent, but if you try to get the flash update from there (in this case from getadobeflash.com), you would be redirected to page which looks like a page to get flash.
The page you will land looks like official page from Adobe, where you can get the updates. The small difference is that it is not a page from Adobe. It redirects to a directory on fake site arulbrothers.com, downloading a file from torreandaluz (dot) com/flash/Flash Player 10 Setup.exe. After checking this file on Virustotal.com, GFI found Sirefef.
Sirefef kills any attempt to remove it, and is nearly impossible to clean. Luckily antispyware developers found the way to delete Sirefef trojan for the PC system. Bad news is that manual removal instructions will not work, as Sirefef mutates, but you can use automated solution. For removal of Sirefef trojam we advise to use SpyHunter, STOPzilla or Malwarebytes Anti Malware.
Information added: 09/24/13 07:01;
information updated: 09/24/13 07:01