I did not find this particular lecture posted here before and it's the best one I have seen so far that covers what became the most famous backdoor of recent history - all in well under an hour (net duration, see chapters).

It is easily distinguished from all the others as it mainly focuses on the "second" part, i.e. how the exploit worked, including with a demo - and so not "just" how it got sneaked into the repo that intrigued many others the most instead.