New Motion in Computer software Defense
Almost all of the offered defense schemes use a so called ‘mounted scheme’ (the defense method adds code to the method which makes it encrypted, compressed and debugger protected). Whenever your plan is started this code unpacks, decrypts and adjusts your software again to its authentic state.
In these kinds of a scenario a cracker’s actions are evident: he suppresses the anti-debugging methods and dumps the unpacked and decrypted application code. Then right after acquiring disassembled and analyzed the code, he just requirements a little patching and he gets a fully functional unprotected duplicate.
What are the weak factors of these defense?
o Defense code extra to an apps is often additional or much less standard and shortly or afterwards it turns into the subject of precise examination. Once the safety code is analyzed, reverse engineering of your guarded application gets a snap. Furthermore there are lots of automatic deprotectors that crackers can use for most preferred defense answers.
o Safeguarded code of the software is encrypted. But prior to it may be executed the protector needs to decrypt it and pass the management to it. This instant is usually intercepted by an intruder so he can obtain the access to the initial code for analyzing/modification.
EXECryptor makes use of a conceptually new strategy to guard software package programs. The core with the defense technological innovation can be a fresh idea with the code transformation referred to as “Code Morphing”. This technological know-how safeguards the code around the CPU-command stage. It can be regarded the x86 processors command procedure is redundant and allows the execution with the similar ‘code’ making use of numerous unique procedure instructions. It breaks up the guarded code into several processor commands or little command snippets and exchange them by other individuals, when sustaining a similar conclusion consequence. Consequently the protector obfuscates the code not within the source level but around the level with the CPU instructions.
The Code Morphing is multilevel engineering that contains countless unique code transformation patterns. Also this technological innovation features the unique layer that transforms some instructions into Virtual Device commands (like P-Code). Code Morphing turns binary code into an undecipherable mess that is definitely not related to regular compiled code, and thoroughly hides execution logic with the protected code.
Unlike other code protectors, there isn’t a principle of code decryption with this technique Protected code blocks are always inside executable state, and they are executed as a transformed code. The initial code is totally lost and code restoration is an NP-hard predicament.
On top of that you do not have to worry with regards to the dimensions or pace of your method since you will not need to remodel its overall code. You must defend only vital sections of your code, responsible for serial amount verification, trial expiration date, together with other evaluation constraints. The rest of application code continues to be intact and software program execution velocity remains the same.
Beneath is really a code sample created by Delphi as well as a partial (the entire listing contains more than 500 recommendations) listing with the transformed code.
Supply code:
writeln(‘Test OK’);
Immediately after compilation:
mov eax, [$ 004092ec]
mov edx, $00408db4
simply call @WriteOLString
contact @WriteLn
get in touch with @_IOTest
Just after the code transformation (partial):
xchg [edi], dl
db 3
increase al, $30
xlat
call +$000025b2
jmp +$00000eec
simply call +$00000941
or al, $4a
scasd
phone -$304ffbe9
rol eax, $14
mov edi, [ebx]
jmp +$00001738
mov ebx, eax
shr ebx, $03
push ebx
jmp +$0001b5e
get in touch with -$000001eb
jmp +$00003203
jmp +$00005df8
name +$00000910
adc dh, ah
fmul st(7)
adc [eax], al
les eax, [ecx+$0118bfc0]
Incoming search terms:
- 3d motion defense
- computer software deffense
- cpu-command level code morphing
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