Jason Garms, Microsoft anti-malware technology team architect and product manager, wrote in a blog entry over the weekend that its December update to the Malicious Software Removal Tool will detect and remove Sony's rootkit.
Beta testers for Microsoft's Windows AntiSpyware, now called Windows Defender, also will receive the security fix in the weekly security update.
Garms also noted the patch will be included in the first public beta of Windows Defender, as well as the Windows Live Safety Center.
''We have analyzed this software, and have determined that in order to help protect our customers we will add a detection and removal signature for the rootkit component of the XCP software to the Windows AntiSpyware beta, which is currently used by millions of users.''
The rootkit component has been in use for months, but it wasn't discovered until recently.