This is a false positive, if you search ether this forum or google, then you will see it's many over the years that reported this, and many of the virus scanners out there have fixed this problem, but still some of them report mirc as a irc flood trojan, nothing to be alarmed for smile so just keep on chatting smile but if you install scripts you downloaded from the net and then get a alert from your virus scanner, then it's in the script you downloaded, not from mirc it self.

if ($me != tired) { return } | else { echo -a Get a pot of coffee now $+($me,.) }