By all accounts it was a modified HQ-9 interceptor which was piggybacked on a short/medium range ballistic missile (mostly because of the high inclination of the test satellite, which might mean it's quite likely to be potentially capable of reaching LEO VISINT satellites which pass over the interceptor on it's own).
Chinese source: http://blog.sina.com.cn/s/blog_49e4b637010007hi.html
I don't speak Chinese but it seems to translate rather well.
