Microsoft has acknowledged that the malware detection of 'Behavior:Win32/Hive.ZY' was due to a problem with a recent update to their virus definitions.
New updates have been deployed by Microsoft to resolve the issue and have already been applied to the majority of computers affected by the issue.
If you are still receiving a warning about being infected with 'Behavior:Win32/Hive.ZY', please run Windows Updates to obtain the most recent virus definitions.