Recently, with the monitoring of how high Google indexes my site by key words, I discovered that I disappeared from the first pages, although there were 3-4 top positions. Then I found your snippet with some Japanese characters and some hidden advertising (will attach screenshot).
At the moment, all the Google searches in my website shows in this broken form, Organic traffic dropped to almost zero. However, other search engines (yahoo) give results in normal looking as they should, everything is OK.
My developer has checked all files and found 2 Trojan, cleaned them up, but it is not clear they were the problem or not.
I will be glad any advice on how to get rid of this problem and to restore the reputation of Google. Thank you.