reversing secrets of reverse engineering phần 10 potx
reversing secrets of reverse engineering phần 10 potx
... a number of high-
level object-oriented languages) for an “object” in the object-oriented design
sense of the word. These are logical constructs that contain a combination of
data and of code ... every aspect of the program revolves around them. Therefore, it
is important to develop an understanding of how they are implemented and of
the various ways to identify them while reve...
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... software that is immune to
reversing. This chapter presents the most powerful and common reversing
approaches from the perspectives of both a software developer interested in
developing a software ... Preventing or obstructing reversers from looking inside copy
protection technologies is often a crucial step of creating an effective means of
protection.
Additionally, some software d...
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... Output 103
The I/O System 103
The Win32 Subsystem 104
Object Management 105
Structured Exception Handling 105
Conclusion 107
Chapter 4 Reversing Tools 109
Different Reversing Approaches 110
Offline ... low-level software and
reverse engineering. There is then a brief introduction of the reverse- engineering
process and the tools of the trade. Finally, there is a d...
reversing secrets of reverse engineering phần 2 ppsx
... keys that can
somewhat affect the size of some of these areas. Figure 3.1 shows a typical lay-
out of the Windows kernel address space. Keep in mind that most of the com-
ponents have a dynamic size ... language.
Assembly Language 101
In order to understand low-level software, one must understand assembly lan-
guage. For most purposes, assembly language is the language of revers...
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... of a humongous
operating system and communicates with dozens of libraries, often developed
by a number of different people.
This chapter deals with one of the most important applications of reversing:
reversing ... Win32VersionValue;
DWORD SizeOfImage;
DWORD SizeOfHeaders;
DWORD CheckSum;
WORD Subsystem;
WORD DllCharacteristics;
DWORD SizeOfStackReserve;
DWORD SizeOfStackCommit;...
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... creation of programs that can accept and produce compatible data is
another branch of reverse engineering that is often referred to as data reverse
engineering. This chapter demonstrates data reverse- engineering ... Workshop is one
of the more powerful data -reversing tools. Here are the first 64 bytes of the
Test1.crx file just produced.
00000000 4372 5970 5465 5839 0100...
reversing secrets of reverse engineering phần 5 doc
... 004 0103 0.
004 0103 0 PUSH ECX
004 0103 1 PUSH ESI
004 0103 2 MOV ESI,SS:[ESP+C]
004 0103 6 PUSH EDI
004 0103 7 MOV EDI,SS:[ESP+14]
004 0103 B MOV ECX ,100 8
004 0104 0 LEA EAX,DS:[EDI-1]
004 0104 3 MUL ECX
004 0104 5 ... cl,cl
004 0107 8 jnz Chapter7!launch+0x10 (004 0107 0)
004 0107 a push edi
004 0107 b lea edi,[esp+0x4]
004 0107 f dec edi
004 0108 0 mov al,[edi+0x1]
004 0108 3 inc edi
00...
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... exception handler
100 000 size of stack reserve
100 0 size of stack commit
100 000 size of heap reserve
100 0 size of heap commit
0 loader flags
10 number of directories
5060 [ 35] RVA [size] of Export Directory
5008 ... in Listing 10. 2.
004 0100 0 push esi
004 0100 1 push edi
004 0100 2 mov edi,dword ptr [esp+10h]
004 0100 6 xor eax,eax
004 0100 8 xor esi,esi
004 010...
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... evaluate their effectiveness against reverse
engineering. For those looking for an accurate measurement of the impact of
obfuscators on the complexity of the reverse- engineering process, there is cur-
rently ... how easy it is for developers of decompilers or disassemblers to work
around these kinds of tricks.
Reversing Obfuscated Code
The following sections demonstrate som...
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... Microsoft compiler in this case:
mov eax, DWORD PTR [c]
mov ecx, DWORD PTR [array]
cmp eax, 100 0
jge EndOfLoop
LoopStart:
mov DWORD PTR [ecx+eax*4], eax
add eax, 1
cmp eax, 100 0
jl LoopStart
EndOfLoop:
It ... none of the conditions are satisfied.
With the more optimized technique, the approach is the same, except that
instead of using an unconditional jump, the last condition is rever...