You probably meant to say that they are the only CA Comodohacker admitted attacking and failing to obtain any fraudulent certificates. Given that there are over

You probably meant to say that they are the only CA Comodohacker admitted attacking and failing to obtain any fraudulent certificates. Given that there are over 100 CAs, it's likely that the same person/organisation attempted attacking others and failed. One interesting thing about that incident is that Startcom never released a report to state exactly what had happened, which is in contrast with some other hacking incidents they suffered. If what Comodhacker said was true (that he had been able to communicate with the NSM), then they definitely were hacked -- just not critically.