warning: if you have two DLL, the first of which calls the second DLL function, they are compiled by different compilers using the fastcall call method, there will be unpredictable consequences.
Both MSVC and GCC compilers pass the first and second parameters through ECX and EDX, and pass other parameters through the stack. The stack pointer must be restored to the initial state by the caller (similar to stdcall ).
Listing 64.4: fastcall
push arg3mov
CauseBy default, a registered user of studio can create a course that does not appear to be the usual usage scenario, and the platform owner prefers a review to allow the user to publish the courseIdeasRead the wiki!!For the novice who is tossing edx, I think the first job is two points:1. Let the platform run up2. Read through the wiki (configuration wiki and edx-platform wiki)If you read through the wiki,
I read an article on IAT encryption processing. I learned how to fix IAT after arriving at OEP. If there is any error, please advise.Copyright: evilangel
Test shell is The original program kryton The Krypter [v.0.2]
I. Shell check:
PEiD shell check:Kryton 0.2-> Yado/Lockless
2. Arrive at OEP
First, load the OD, ignore all exceptions, and stop
00434000> 8B0C24 mov ecx, [esp];
Kernel32.7C81702700434003 E9 0A7C0100 jmp 0044BC1200434008 AD lods dword ptr [esi]00434009 42 inc edx0043400A 40 inc eax00
, the application should assign the eax register a value of H and execute the cpuid command:
MOV EAX, 80000000HCPUID
After the execution is complete, the results will be saved in the eax register. To return valid CPU extension information, the eax register should always pass a value greater than or equal to H and less than or equal to the value of the result.
In any case, if the value passed to eax is greater than the maximum value it can accept, or the function that returns the extended informa
From http://zerray.com/
Looking at the hooks in Win32 compilation, I was wondering how to write a whole-person program that changed the keyboard layout.
Check the information and find that the underlying keyboard hook (wh_keyboard_ll) can be implemented. First, install and uninstall the HOOK:
Installhook proc hins: DWORDInvoke setwindowshookex, wh_keyboard_ll, ADDR keyproc, hins, nullMoV hhook, eaxRETInstallhook endp
Uninstallhook procInvoke unhookwindowshookex, hhookRETUninstallhook endp
Like
will only press the parameter stack and then call it, but this is not the form of _ fastcall. it is also because it does not support _ fastcall, which makes assembly and other languages (such as C) mixed programming difficult once _ fastcall is involved.
We all want to adopt some strategies to make MASM support the _ fastcall call method. In other words, it enables MASM to define and call functions of the _ fastcall type.
To achieve this goal, we must first understand the characteristics of t
again!" In this error dialog box today !" . Start OllyDBG, select the menu File> open the CrackMe3.exe file, and we will stop here:
In the Disassembly window, right-click a menu and choose search> all reference text strings and click:
Of course, it is more convenient to use the above super string reference + plug-in. However, our goal is to be familiar with some OllyDBG operations. I will try to use the built-in functions of OllyDBG with less plug-ins. Now, in another dialog box, right-click
choose search> all reference text strings and click:
Of course, it is more convenient to use the above super string reference + plug-in. However, our goal is to be familiar with some ollydbg operations. I will try to use the built-in functions of ollydbg with less plug-ins. Now, in another dialog box, right-click it, select the "Search Text" menu item, and enter "Wrong serial, try again !" The start WORD "wrong" (note that the search content is case-sensitive) to find one:
Right-click
The concept of Emba was first born in the Chicago School of Management in the United States, its ultimate goal is to develop senior management, because the birthplace is in the United States, and therefore, the United States Emba is also relatively perfect, so, then in the United States to study EMBA can apply for foreign academic certification? Sea state education to explain to you:An MBA is a degree that focuses on the development of a comprehensive
performance is still adequate, but nearly 8000 yuan for the price you can choose a lighter and more durable MacBook Air.
So our attitude towards the normal screen MacBook Pro 13 is not recommended for anyone to buy. Next we will analyze the 12-inch new MacBook, 11 and 13-inch MacBook Air, 13 and 15-inch Retina MacBook Pro, and the "all MacBook Notebooks" that are mentioned below won't contain this normal screen version of the MacBook Pro.
No need to pursue the lightest and thinnest
We care a
Codefunction Strtohex (Const str:ansistring): ansistring;AsmPush EBXPush ESIPush EDITest Eax,eaxJZ @ @ExitMOV Esi,edx//Save the EdX value, the address used to generate the new stringMOV edi,eax//Save original stringMOV edx,[eax-4]//Get string lengthTest Edx,edx//Check length
Virus program source code instance analysis-CIH virus [3] code, you need to refer to the jmp ExitRing0Init; exit Ring0 level
; Size of the merged code
CodeSizeOfMergeVirusCodeSection = offset $
; New IFSMgr_InstallFileSystemApiHook function call
InstallFileSystemApiHook:
Push ebx
Call @ 4
@ 4:
Pop ebx; get the offset address of the current command
Add ebx, FileSystemApiHook-@ 4; the offset difference is equal to the offset of FileSystemApiHook.
Push ebx
Int 20 h; call Vxd to remov
Protection Mechanism
[Statement]I write articles mainly for communication, and hope that you can maintain the integrity of the article during reprinting.
[Preface]This time I focused on the protection mechanism and did not write any shell removal method. In fact, I have misled many kind audiences. The most important thing to know about a shell software is its protection mechanism, which I learned later. The following describes some protection mechanisms. This is only for everyone and me to lear
-click a menu and choose search> all reference text strings and click: Of course, it is more convenient to use the above super string reference + plug-in. However, our goal is to be familiar with some ollydbg operations. I will try to use the built-in functions of ollydbg with less plug-ins. Now, in another dialog box, right-click it, select the "Search Text" menu item, and enter "Wrong serial, try again !" The start WORD "wrong" (note that the search content is case-sensitive) to find one:
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