This virus is hard to detect as it uses a stealth technique, which hides in software. It is considered as the largest botnet in the internet affecting over 3.5 million PCs. The one solution that can best work is to run a hardware based solution that is non writable.

Anna Kournikova Worm: This computer worm was written by a Dutch programmer called Jan De Wit. This worm was another mail related attack where an email with subject line ‘Hi check this’ with a pictured labeled Anna Kournikova, but actually never had a picture, but once the mail was opened the worm would automatically launch the message to all the contacts of the victim.

The maker of this virus later turned himself in and was pardoned from the original sentence to 150 hours of community service or 75 days in jail.

Flame:  "According to most threat researchers today, only governments have the necessary resources to design and implement a virus of such complexity," said Lovet of Flame and similar types of cyber espionage attacks as reported by efytimes.com. This malware is the most complex and sophisticated one ever found and it is being used in the Middle Eastern countries to destroy cyber space and also retrieve information.

This malware can basically collect information from almost any source through the computer like video, sound, keyboard, Skype and Bluetooth. Flame uses a high level of defense mechanism to cover the tracks of its user. The origin of this malware is still a speculation where no country is willing to take the responsibility though America and Israel are the main accused.

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