Criminals are stepping up their attacks leveraging an unpatched flaw in Microsoft's Internet Explorer
browser, using it to install fake antivirus
products and malicious back doors on victim's computers.
Microsoft first warned
of the bug on March 9, saying that it had been used in "targeted attacks." But now, according to researchers, the exploits are much more widespread. By late last week, security vendor AVG was getting reports of 30,000 attacks per day, according to Roger Thompson, AVG's chief research officer.