Bloodhound functionality?

Dears,

I found this description on bloodhound from the admin guide "Bloodhound locates and isolates the logical regions of a file to detect virus-like behavior", so from what i understand is that its kind of like SONAR but bloodhound functions on pre-execution of the file unlike SONAR that monitors file while in-execution to monitor its behavior, is thats correct?

Thanks in Advance