Microsoft has decided that the Sony malware (masquerading as DRM software) is a problem:

We use a set of objective criteria for both Windows Defender and the Malicious Software Removal Tool to determine what software will be classified for detection and removal by our anti-malware technology. 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.

I suspect that other vendors that haven't already done so will follow suit. I wonder when Sony will figure out that they have a PR problem of epic proportions on their hands?