The download is available here: http://www.microsoft.com/downloads/details.aspx?FamilyID=4D056748-C538-46F6-B7C8-2FBFD0D237E3&DisplayLang=en
The update disables the ADODB.Stream object from Internet Explorer. This vulnerability has been known for about a year, but has not previously been acknowledged by Microsoft. It has been used in dozens of attacks to silently install and run malicious software, including the last week's Download.Ject attack (also known as JS.Scob.Trojan, Scob, and JS.Toofeer), and this week's attack which installs a malicious BHO through compromised advertisement servers which then steals on-line banking account names and passwords, called "Trojan.Spy.Small.AA", "PWS.Banker.C.Trojan", "PWS-WebMoney.gen", and "bankhook.a".
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