The creators of the latest MyDoom variant, which exploits a recently discovered iFrame vulnerability in Internet Explorer, may have timed the release of the viruses to throw Microsoft's

In its latest monthly update on Tuesday, Microsoft was not able to fix a serious vulnerability in the Internet Explorer browser because the flaw was discovered only a few days before the company's regular update was due. The two variants of the MyDoom virus were released earlier this week, leaving the software giant without any option but to ignore the problem--for now.