Check for Trojans when updating

Just allowed Parallels to update Parallels to v.16.1.2 and Parallels Toolbox to v.4.1.0 and suddenly was alerted to three Trojans installed found at that time. Two landed in Application Support. All landed in the Library. This is not an accusation against Parallels, but an alert to be watchful. I run a Mac with Paralllels running Windows software. The Trojans could be directed at Windows software and could have been also been hustled in by a MetaTrader 4 Help update that occurred 3 minutes before the Parallels update was offered.
Caution costs nothing and catching Trojans before they do damage is a good thing.