@wired420 is absolutely correct. However you don't have to take our word for it. You can double check the current random name by opening the EQBCS.ini file (located in the base folder for your MacroQuest installation) and the MacroQuest.ini (located in the config folder of your MacroQuest installation) file in a text editor.
The EQBCS file will have an entry that looks like:
[Internal]
RenamedProcess=some_random_characters.exe
Meanwhile the MacroQuest.ini file will have a section that looks like:
[Internal]
SpawnedProcess=a_different_set_of_random_characters.exe
If your anti-virus program blocked a file that matches one of these two file names you can be assured it's safe to ignore the antivirus warning and whitelist the Macroquest installation folder.