Mac security firm Intego sounded the alarm Thursday on a trojan horse it spotted hiding in pirated copies of Apple’s iWork ’09. Since then, several more security solution providers have responded. On the surface, the trojan — OSX.Trojan.iServices.A — might seem relatively benign. After all, only those who stole a copy of iWork ’09 can get it. While those numbers may edge into the thousands, pirate Mac lovers tend not to be clients of enterprise Mac security solution providers.