Phrase appears in advanced search
 

Guys, when I do a advanced search on my forum, in the keywords section I see this code pre-entered:

select * from user ORDER BY posts desc limit 10

Could this be from some hack? Code that has been corrupted and pasted twice? I'm not sure where it's coming from but it can be deleted from the search field and the search works fine. I've upgraded fresh three times and this code still appears in the advanced search. I did a mysql search to see if the phrase appears in any template or modification and I got no results. Wondering if anyone would know why it keeps appearing.