UPDATE: See Intego's full security memo with detailed information about the MAC Defender fake antivirus.
If the user continues through the installation process, and enters an administrator's password, the software will be installed.
It is important that users not continue with any unexpected installation of this type. Intego VirusBarrier X6's malware definitions will be updated today, and Intego will be publishing a security memo when we have more information about this malware. For now, the threat is low, but users should be careful not to install software when installers open unexpectedly.