Is this instantaneous disappearing firewall window pop-up query about process mediasharingd a security issue? Possible rootkit attempt?

Is this a security issue to be really concerned about? A rootkit?
Query window pops out and instantly disappears ("as if it was clicked in", but that’s not possible, because it’s in a flash) on Desktop after booting asking for al… Continue reading Is this instantaneous disappearing firewall window pop-up query about process mediasharingd a security issue? Possible rootkit attempt?