edi 845

ESI, dword ptr [ESI + 78 H] // data directory Table offsetAdd ESI, EBXMoV EDI, dword ptr [ESI + 20 h] // function name array offsetAdd EDI, EBXMoV ECx, dword ptr [ESI + 14 h] // number of elements in the function address ArrayPush ESIXOR eax, eaxMoV edX, dword ptr [ESI + 24 h] // function name sequence number table array offsetAdd edX, EBXSHL eax, 1 // count * 2Add eax, EDX // count + function name sequenc

sufficiently compatible with the real attack features? Through vulnerability analysis, we will naturally draw a conclusion. Czy82 on the nsfocus Technology Forum published a detailed analysis of this vulnerability, see the original article: http://bbs.nsfocus.net/index.php? Act = se F = 3 t = 159298 P = 299648 The code analysis snippets of server processing commands and parameters in the analysis document are as follows: ========================================================== ============

filetime * lpfiletime, // pointer to file time to convert; Lpsystemtime // pointer to structure to receive system time;);Invoke filetimetolocalfiletime, ADDR stfilelastwritetime, ADDR stlocalfiletimeInvoke filetimetosystemtime, ADDR stlocalfiletime, ADDR stsystime. If eax = 0MoV dwresult, offset g_szfiletimetosystemtimeerr. ElseInvoke policime2str, ADDR stsystime, lpstrbufMoV dwresult, 0. Endif. EndifInvoke closehandle, hopenfileMoV eax, dwresult. Endif RETG_szfailtocreatefile DB "file creation

determines whether the returned result is near or far (of course, the pseudo command is not visible from the executable file ).In wvin7 + vs2008 + release, this situation is much more complicated. --- D: \ coding \ helloworld \ testc \ main. c optional int main () {00331370 push EBP 00331371 mov EBP, esp 00331373 sub ESP, 0c0h 00331379 push EBX 0033137a push ESI 0033137b push EDI 0033137c Lea EDI, [ebp-0C

xchg ESI, EBX @ 1: CMP eax, EDX Jae @ 2 xchg eax, EDX xchg ESI, EDI @ 2: CMP ECx, edX jbe @ 3 xchg ECx, EDX xchg EBX, EDI @ 3: end; // In: ESI = srcpixel, EDI = dstpixel, eax = gray // out: [EDI] = mixercolorprocedure colormix; const grayconst: array [0 .. 2] of intege R = (113,604,307); var gray, max_min: longword; A

Reading Tips: 《Delphi Image ProcessingThe series focuses on efficiency. The general code is Pascal, and the core code is BaSm. 《C ++ Image ProcessingThe series focuses on code clarity and readability, and all uses C ++ code. Make sure that the two items are consistent and can be compared with each other. The code in this article must include the imagedata. Pas unit in "Delphi Image Processing-data type and public process. The minimum value processing of an image is centered on the current pixel

the API function address we want to intercept, modify it. Invoke GetModuleHandle, addr DllName; get the name of the DLL where the API is to be intercepted Invoke GetProcAddress, eax, addr ApiName Mov ProcAddr, eax; gets the address of the API we want to intercept and stores it in ProcAddr. . While! ([Esi]. originalFirstThunk = 0 [esi]. timeDateStamp = 0 [esi]. forwarderChain = 0 [esi]. name1 = 0 [esi]. firstThunk = 0); The imported table is ended by an IMAGE_IMPORT_DESCRIPTOR of all 0. Mov

The place that strcpy didn't take into account Original posted Address:Http://eparg.spaces.live.com/blog/cns!59BFC22C0E7E1A76!1498.entryOriginal Paste Time:2006-08-16Original Paste Author:EpargThe discussions of the year were in: Http://eparg.spaces.live.com/blog/cns!59BFC22C0E7E1A76!533.entry When Http://eparg.spaces.live.com/blog/cns!59BFC22C0E7E1A76!875.entry first considered the performance of strcpy, only 4bytes copies were considered. But ignoring a key question is how to judge the end of

, Then use SoftICE to set a breakpoint on the address, SoftICE should be immediately broken, You'll see mov DWORD PTR ds:[eax+ecx*8+eb4],edi, In the client, the position is 0x4b2c74, You can change the course of the game, Put mov DWORD PTR ds:[eax+ecx*8+eb4], EDI changed into a E9 xx xx xx xx 90 90, JMP the free address between the rsrc and. Data in the process. The code (xx xx xx xx) + 0x4b2c74 + 5 is modi

#include #include int main (){__asm{CLD//empty flag bit DFPush 0X1E380A6A//press-in Messageboxa-->user32.dllPush 0x4fd18963//press-in Exitprocess-->kernel32.dllPush 0x0c917432//press-in Loadlibrarya-->kernel32.dllmov Esi,esp//esi=esp, pointing to the address in the stack where LoadLibraryA is storedLea Edi,[esi-0xc]//edi = stack top position -0xc, e.g. 0x0012ff28-0xc==0x0012ff1c====== open up some stack spa

: 0803DD09 xor eax, ebp. Text: 0803DD0B mov [ebp + 108 h + var_4], eax. Text: 0803DD11 push 4Ch. Text: 0803DD13 mov eax, offset loc_8184A54. Text: 0803DD18 call _ EH_prolog3_catch // set up an SE handler. Text: 0803DD1D mov eax, [ebp + 108 h + arg_C]. Text: 0803DD23 mov edi, [ebp + 108 h + arg_0]. Text: 0803DD29 mov ebx, [ebp + 108 h + arg_4]. Text: 0803DD2F mov [ebp + 108 h + var_130], edi. Text: 0803DD32

: 00412AC6 test cl, cl. Text: 00412AC8 jz short loc_412B06. Text: 00412AC8. Text: 00412ACA lea ecx, [esp + 8 + var_4]. Text: 00412ACE lea edx, [esp + 8 + arg_0]. Text: 00412AD2 push ecx. Text: 00412AD3 push edx. Text: 00412AD4 push eax. Text: 00412AD5 call sub_4444C0.. Text: 004444C0 sub esp, 5Ch. Text: 004444C3 push ebx. Text: 004444C4 push ebp. Text: 004444C5 push esi. Text: 004444C6 push edi. Text: 004444C7 mov

Debug versionESP stack top pointerEBP holds stack pointer Empty program: Int main () { 00411360 push ebp, press into EBP 00411361 mov ebp,esp; EBP = ESP, keep esp, wait for function call to resume, ESP is definitely used in a function call. 00411363 Sub esp,0c0h; esp-=0c0h (192); Leave temporary storage for the function ; put the values in other pointers or registers into the stack to use them in the function. 00411369 push ebx; Press into EBX 0041136A push esi, press into ESI 0041136B pu

, ESI73D311B9 FF50 60 call dword ptr ds: [EAX + 60]; PreTranslateMessage (Message preprocessing)73D311BC 85C0 test eax, EAX73D311BE 75 0E jnz short MFC42.73D311CE73D311C0 57 push edi; message preprocessing returns FALSE73D311C1 FF15 ACB6DC73 call dword ptr ds: [73D311C7 57 PUSH EDI73D311C8 FF15 30B6DC73 call dword ptr ds: [;73D311CE 6A 01 PUSH 1; return TRUE73D311D0 58 POP EAX73D311D1 5F POP EDI73D311D2 5E POP ESI73D311D3 C3 RETN Tip:A. OD after the p

From [wenjuliu25]: HelloWorld disassembly Analysis Lab environment:Visual c ++ 6.0 Objective: To analyze the memory allocation of a simple c program during program execution using assembly language /******* Mymain. cpp *********/ 1: # include 2: int main () 3 :{ 4: int x = 1; 5: printf ("Hello Canney \ n "); 6: return0; 7 :} /******* Mymain. asm *********/ 1: # include 2: int main () 3 :{ 00410950 push ebp 00410951 mov ebp, esp 00410953 sub ESP, 44 h // ESP = esp-0x40, allocate stack space t

stack occupied by the pressed ParameterPush ESI // protect the peripheral memoryPush EDIPush ECxPush edXMoV eax, [esp + 11bch]Push eaxMoV ESI, [esp + 11bch]Push 11a9h // Replace the value with an overflow ValueLea ECx, [esp + 24 h]PushecxMoveax, [esp + 11bch]PusheaxCall Recv // Recv forwardingTest eax, eaxJle loc_2CMP eax, ESI // determine whether the packet is receivedJle loc_1Movedx, [esp + 11ach]Xoreax, eaxDec eaxCmpedx, 0x90909090 // compare the specified overflow address valueJneloc_2Movea

CPU switches from user mode to privileged mode, then jump to the kernel code to execute the exception handling program.In the "B INT" command, the value 0x80 is a parameter. In exception handling, the parameter determines how to handle the problem. In the Linux kernel, an int 0x80 exception is called a system call.The values of C eax and EBX registers are two parameters passed to the system call. The value of eax is the system call number, 1 indicates _ exit call, and EBX indicates the paramete

;//////////////////////////////; First get the relocation difference Call rebaseRebase:Pop EBP;Sub EBP, offset rebase;; Get the kernel32.dll's base address; By peb direct access; Place in here not routine; Because we need it afterAssume FS: nothing; MoV eax, FS: [30 h]; PTR _ TebMoV eax, [eax + 0ch]; PTR _ peb_ldr_dataMoV eax, [eax + 1ch]; list_entry ininitializationordermodulelist. flinkMoV eax, [eax]; flink's flinkMoV eax, [eax + 08 h]; The Kernel32's base addressMoV [EBP + dwbase], eax;MoV EC

about some personal opinions. Next, we will conduct some small tests and explain them in assembly language. You can do it together. (1) Char name [] and char * Name 1:2: void process()3: {00401020 push ebp00401021 mov ebp,esp00401023 sub esp,4Ch00401026 push ebx00401027 push esi00401028 push edi00401029 lea edi,[ebp-4Ch]0040102C mov ecx,13h00401031 mov eax,0C

the arguments of the constructor, and is initialized with 1, which omits a step, speeds up the operation, and achieves the same effect. Note: In the above assembly, Visual Studio compiler optimizations have been turned off, indicating that this approach has been used as a general method of Visual Studio, rather than as a vs-perceived optimization tool.Initialize 3:classtest ct3 = Ct1Classtest ct3 = ct1;//Copy Initialization00b09538 Lea Eax,[ct1]00b0953e push EAX00b0953f Lea ECX,[CT3]00b09545 ca