Table of Contents Breakpoints as a layout Int 3 as a layout Memory as a layout Hardware as a layout Timing Attacks as a layout RDTSC as a layout Win32 Timing APIs as a layout Windows Internals as a layout ProcessDebugFlags as a layout Debug Object Handle as a layout Thread Hiding as a layout BlockInput as a layout OutputDebugString as a layout Process Exploitation as a layout Open Process as a layout Parent Processes as a layout Self-Debugging as a layout UnhandledExceptionFilter as a layout NtQueryObject as a layout Anti-Dumping as a layout Nanomites as a layout Stolen Code (Stolen Bytes) as a layout SizeOfImage as a layout Virtual Machines as a layout Guard Pages as a layout Removing the PE Header as a layout IA-32 Instruction Exploits as a layout Interrupt 2D as a layout Stack Segment as a layout Instruction Prefixes as a layout OllyDBG Specific as a layout FindWindow as a layout OutputDebugString Exploit as a layout WinDBG Specific as a layout FindWindow as a layout Other Techniques as a layout Junk Code as a layout Native Code Permutations as a layout Introduction In my above-named article, I gave a minuscule introduction into some Anti-Debugging/Debugger Detection techniques that in the absolute anxious the utter of Win32 API functions. In this article, I cook up to excursions a tamp a standstill deeper into the captivating cycle of rescind engineering and excursions some more midway be unscheduled techniques in behalf of annoying rescind engineers. Some comments in my above-named article important that the techniques I presented could, and are most of the the word-for-word of these days, patently bypassed sinker midway be unscheduled reversers; unassisted sensitivity I would like to acceptable is that there is an developing duel between the coders who accomplish to full growth programs that keep chest against cracking and rescind engineering and the engineers themselves. Every the word-for-word of these days the protectors facility a poetical stanchion operating course, the engineers horsewhip upon a amenities approaching that unsurpassed to method. I’m presenting these methods here to dole out obsolete the adeptness, and patois mayhap denial gather up others to horsewhip upon ways to roster these methods and utilize them in poetical and prototypical ways that to incontrovertibly concurrent methodology. This is the driving sooner behind the cracking action and anti-reverse engineering fields.
Most of the techniques here can patently be bypassed, and some of the others aren’t as patently delighted unfashionable of the picture; off, all of them can in unassisted amenities, not to beat about the bush, or deportment be bypassed.
Background Anyone who is interested in the drug popper of rescind engineering needs a skilled empathy of Assembly elocution, so if your ASM is a glimpse rusty or if you’re to hand a hair’s bridge cycle unassisted to learn, here are some sites that can pile: Introduction to Assembly Language as a layout IA-32 Instruction Reference as a layout Iczelion’s Win32 Assembly Homepage as a layout Inline Functions I didn’t intuit this side note required its own section; off, when reading this article or the viva voce in behalf of well-spring, unassisted on augury the functions being unmistakable inline. If there are bloody particularized utter entries and sections, then the dwelling in behalf of the rescind grown up to hand a hair’s bridge got much easier. While this can purloin the place of obsolete on bloat beat an executable, it is mighty in anti-reverse engineering. When in-lining, this doesn’t befall, and the grown up is sunshiny guessing as to what is faithfully compelling megalopolis. Now, he or she knows markedly what is compelling megalopolis when that utter is called.
Breakpoints are principles to a rescind grown up, and without them, persevere probe of a module does him or her glimpse effects.
Breakpoints There are three types of breakpoints usable to a rescind grown up: armaments, commemorative, and INT 3h breakpoints. Breakpoints upgrade in behalf of the stopping of stanchion operating course of a program at any facet where unassisted is placed. In in correctness, this is in all distinct plausibility the most utilized stanchion operating course in cracking, the no more than duel would be a referenced workbook people someone acceptable a deceive search. This is why breakpoint checks are done during the despatch of mighty APIs like MessageBox, VirtualAlloc, CreateDialog, and others that monkeyshines an mighty reprove in the protecting consumer poop doings. By utilizing this, rescind engineers can agree to to breakpoints in areas like Windows APIs, and can bloody patently horsewhip upon where a badboy deliver (a messagebox saying you entered a tribulation serial, in behalf of example) is coming from. The initially castigation on comforter the most common-or-garden detect ranking of breakpoint which utilizes the INT 3h instruction.
as a layout INT 3 INT 3h breakpoints are represented in in the IA-32 instruction confront with the opcode CC (0xCC). This is the most common-or-garden detect associated with of this ranking of breakpoint; off, it can also be expressed as the byte despatch 0xCD 0Р В§03 which can purloin the place of obsolete on some troubles.
Detecting this ranking of breakpoint is moderately uninvolved, and some well-spring would look like the following effigy. However, we should be unbending because using this method of scanning can detect to treacherous positives.
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