Back in middle to late 2000s, me and my friend discovered that our Delphi 7 installations were infected by Induc.A, which infected the compiler by registering a

Back in middle to late 2000s, me and my friend discovered that our Delphi 7 installations were infected by Induc.A, which infected the compiler by registering a pascal module and including itself in all the builds compiler produced. We traced the infection back to a legit software build (it was either AIMP player or QIP messenger, I don't remember already), that was apparently built with an infected compiler.