I recently downloaded and installed game on my PC and Norton flagged a security issue and put it in quarantine. It has happened at least twice. Norton complained that Destiny2.was is infected with IDP.SEMS.RAT.Bifrost3.
I have sent Destiny2.exe for Norton to further analyze it.
Please not I am not a new player and used to play Destiny2 long time back and never had such error . I am setting it up so that I can play when Final Updates drop on June 9th.
I was able to play again after game repair. I use Xbox by the way and not Steam to play on PC if that makes any difference.
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That's a "usual" false positive.