olemus
juurkratt, mis on
installitud tootesse
enne selle jõudmist kasutajani

näiteid
http://anonhq.com/lenovo-still-using-rootkit-for-software/

http://www.breitbart.com/tech/2015/11/24/dell-compromises-customers-security-with-pre-installed-rootkit/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+breitbart+%28Breitbart+News%29

https://arstechnica.com/security/2016/11/powerful-backdoorrootkit-found-preinstalled-on-3-million-android-phones/

http://thehackernews.com/2016/11/hacking-android-smartphone18.html

https://lifars.com/2016/11/3-million-android-devices-vulnerable-dangerous-pre-installed-rootkit/