This material has only educational purpose!
Target: OllyDbg
Difficulty: n/a
Tools: Api Reference, OllyDbg, mASM and Brain.
Introduction
The year is 2004.The ring-3 debuggers are used often and often.Since
they offer Windows GUI they are more handy instead of the ring-0
debuggers (like SoftIce).In this essay i will talk (write) about the
detection of one of the best ring-3 debuggers - OllyDbg.Many have heard
of the IsDebbugerPresent and of the fs:[20] detecting tricks, but what
about some other new ones? Here I will present you some of my own
detecting tricks.I will give you the general explanation so you would
be able to use your fantasy to improve it yourself.