Virusdefender.org is a misleading and dangerous site that distributes malware. Basically, it's screen with a fake animation, false system security threats and errors (fake online anti-malware scanner). As you can see in images below, Virusdefender.org fake scanner uses Windows Vista OS style, icons and etc. to make that scam look more realistic. Of course, it's kind of funny when you see Vista icons on a computer running Windows XP. Virusdefender.org domain was registered through bizcn.com and as you may guess its owner is from China. Registrant information:
After the fake scan, Virusdefender.org reports false scan results and prompts to download free malware removal tool. This supposed malware removal tool is actually a Trojan virus Win32/Agent.QOH [ESET]. If you have inadvertently downloaded something from Virusdefender.org then you should definitely scan your computer with antivirus or anti-malware program. You may choose from MalwareBytes' Anti-malware, Spyware Doctor, SUPERAntispyware, Spybot S&D, Combofix. If you have any questions please don't hesitate and ask or leave a comment. Good luck and be safe!
Screen shots of Virusdefender.org:
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