In the new millennium, the most common form of malware attack has become known as drive-by downloads.

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According to a study by Google researchers last February, more than 3 million out of 60 million pages analyzed were found to perform "drive-by downloads, " invisibly installing malicious software on users' machines.

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In several recent cases, hackers have infected hundreds of thousands of Web servers with software that performs "drive-by downloads" on any visitor's machine, installing password-stealing Trojans or turning the PC into a spam-spewing zombie.

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According to a study by Google (nasdaq: GOOG - news - people ) researchers last February, more than 3 million out of 60 million pages analyzed were found to perform "drive-by downloads, " invisibly installing malicious software on users' machines.

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Thakur might have also noted that users have some responsibility for avoiding drive-by-downloads, too.

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Unlike smart phone hacks or other mostly-theoretical vulnerabilities, PCs are constantly hijacked by drive-by-downloads that exploit browser flaws.

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