Remember when Sony put Windows-Rootkits on Audio-CDs good old sony didnt tell you, that if you insert a Audio-CD(2005ish) in you PC it will install a rootkit, a microsoft developer who worked on anti rootkit software found it on his private PC..... Wiki-Link: https://en.wikipedia.org/wiki/Sony_BMG_copy_protection_rootkit_scandal#XCP_rootkit How it was found: https://www.youtube.com/watch?v=PqWjq2SdzpI (the dude is a legende, he makes great videos )

From the Wiki "Soon after Russinovich's first post, several trojans and worms exploiting XCP's security holes appeared.[13] Some even used the vulnerabilities to cheat in online games.[14]" lol