When you search for OOO000000, you find 12 results relating to a backdoor script in PHP.
Questions about this specific backdoor still do come up every once and a while, and we always close them as Too Localized. Since these questions do seem to repeat themselves, Too Localized seems to have lost some of its merit.
Now I've found this, which can be considered as some sort of reference question.
I request assistance in closing the other questions as duplicates of that, so that we can use it as a sink for all of this types of questions.