Microsoft says it will issue a software fix to block Chinese hackers at 5.00am Friday, Australian time after "working round the clock" to fix the problem.
The software giant, which has been embarassed by hackers using the flaw in Internet Explorer to hack some of the worlds largest companies undetected since mid-December, says the update will be the standard February cumulative update, with the inclusion of the security flaw fix.
Microsoft said the release would be issued as a "critical" package.
In the meantime, Microsoft continued to recommend people stop using Internet Explorer 6 or 7 immediately, and upgrade to Internet Explorer 8, which has some level of protection against the hackers (though not complete protection). For the protection to be effective, you must also install the latest patches to Windows such as XP SP 3, or Windows Vista SP1 (both of which have data execution prevention enabled by default.)
However, it did not go as far as repeating the German and French governments' advice that people should stop using Internet Explorer altogether, and switch to Firefox or Google Chrome instead, which are not subject to the same security flaw.
Microsoft continued to state that it had only seen live attacks targeted at Internet Explorer 6 users, even though the attackers could exploit machines running IE7 or IE8.