If you're going to host a server, for the love of god atleast get some sort of forums set-up, domain name, dedicated hosting, more media then some teleport options, some information about your server etc etc, although, this is probably a virus.
Edit, took a look through your launcher, you're using a launcher to download then load another jar file, to download the cache? what.
P.S for those wondering, it's a Ruse leech.