I'm still guessing it's the support email platform they are using...
Btw what the file does is download something from dropbox that will send your wallet.dat somewhere and delete yours. This can easily be prevented by not having it at the default location.
this is not support platform. it is Zendesk we are using , a hosted service which is used by millions of other companies.
As mentioned before my problems regarding this spam started when you asked me to send my inquiry via a different email account. So I sent my inquiry (which still has not been answered) via three different email accounts, two of them have never been in touch with bitcoin/litecoin related websites. Several hours later I received emails from "Minereu" with "invoice" as topic including those JAR Files on each of my accounts which I previously used to send the email. (Unfortunately I opened the .jar file and lost ~90LTC but this is not the point here)
I still receive that spam emails on those accounts although I never used them on other btc/ltc related sites before or after I sent you the inquiry.