gsx edi

code. The complete code for searching getprocaddress in Kernel32 is as follows: Push ESI; ESI = va kernel32.base; EDI = RVA k32.pehdrMoV EBP, ESIMoV EDI, [EBP + EDI + Peh. datadirectory] Push EDI ESI MoV eax, [EBP + EDI + peexc. addressofnames]MoV edX, [EBP +

00 ................ 0x00401010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0x00401020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ All are 0.1.1.2 dynamic compilation According to the online materials, this section is related to incremental links and dynamic compilation. Check the linker parameters to ensure that the incremental link is opened for verification. Insert a test function before the main function and call it in main: Int add (int A, int B) { Return A +

, special registers (control, debug, segment)Can only be transmitted to the general register, or to the content transmitted from the General Register.When referencing a label:Cases:. Section. DataValue. int 100_start:MOVL value,%eaxMOVL $value,%eaxMovl%ebx, (%edi)MOVL%EBX, 4 (%edi)Where: Movl value,%eax simply passes the memory value currently referenced by the tag value to EAXMOVL $value,%eax passes the me

Learning Goals:Mobile Item Function EncapsulationHomework:Extract the signature of the warehouse list base address, and add back to the warehouse list base address to update the code.BOOL Movegoodtodepot (char*szpgoodsname);//move the specified items in the backpack into the warehouse#define BASE_DEPOTLIST 0x31c9a24//Warehouse list base address DD [[0x31c9a24]+410+4*0]#define BASECALL_MOVEGOODS 0X007A0A20//Mobile Item CallAdd the following member functions in the Backpack list structureBOOL selg

, 29Ch80542599 c686400000001 mov byte ptr [esi + 140 h], 1805425a0 3bec cmp ebp, esp805425a2 758d jne nt! KiFastCallEntry2 + 0 x 49( 80542531)805425a4 83652c00 and dword ptr [ebp + 2Ch], 0805425a8 f6462cff test byte ptr [esi + 2Ch], 0FFh805425ac 89ae34010000 mov dword ptr [esi + 134 h], ebp805425b2 0f8538feffff jne nt! Dr_FastCallDrSave (805423f0)805425b8 8b5d60 mov ebx, dword ptr [ebp + 60 h]805425bb 8b7d68 mov edi, dword ptr [ebp + 68 h]805425be 895

;Farproc closehandleadd;Farproc writefileadd;Farproc createfileaadd;Farproc getmodulehandleaadd;Farproc procloadlib; Farproc apifnadd [1];Farproc procgetadd = 0; Char * stradd, * stradd1, * fmtstr;Int imgbase, fnbase, K, L;Int findaddr;Handle libhandle;DWORD ret; // Create an exception handling code for our own Exception Handling Code_ ASM {// INT 3MoV eax, 1JMP nextcallGetstradd:Pop straddLea EDI,MoV eax, dword ptr fs: [0]MoV dword ptr [

. Recently, because of a "small problem", the kernel level of Linux kernel and FreeBSD has beenTracking and debugging, and then discovering a very interesting problem, I feel that this problem may be different from the Linux shellcode andThe shellcode differences under FreeBSD are also slightly related to the system architecture. The following content isThe following is a compilation of syscall code.In Linux, the application uses the following code to call syscall:420d4330 55 push EBP |420d4331

szReadBuffer3Mov jjj, esiMov esi, offset szReadBuffer2@@:Mov al, [esi]Movzx eax, alMov edi, offset dubisMov ecx, 17Repne scasbXor eax, eaxMov al, 16Sub eax, ecxShl eax, 04Mov ecx, jjjMov [ecx], alInc esiMov al, [esi]Movzx eax, alMov edi, offset dubisMov ecx, 17Repne scasbXor eax, eaxMov al, 16Sub eax, ecxMov ecx, jjjOr [ecx], alInc jjjInc esiInc jjj2. If jjj2 = 34Jmp @ F. EndifJmp @ B@@:;__________________

(Contact feeling processing is a bit complex, involving multiple loops, later by the people reminded that the process also involves linked list operations) First, the assignment operation,%edx=%ebp+8 (that is, the input string start address, also phase_6 passed in parameters) stored at the value,%eax=%ebp-24, and%eax and%edx into the stack, call read_six_numbers function, its functions are described earlier.　　Then the read out of the corresponding processing of the number, followed by a la

1. Debug versionintMain () {011752E0 push ebp 011752E1 mov ebp,esp 011752E3 sub esp,0c0h 011752E9 push EBX 011752EA push esi 011752EB push EDI 011752EC Lea EDI,[EBP-0c0h] 011752F2 mov ecx,30h 011752F7 mov eax,0cccccccch 011752FC rep stos dword ptr Es:[edi] cout5; 011752FE mov esi,esp01175300Push5 01175302mov ecx,dword ptr ds:[1180090h]01175308Call dword ptr ds:[

;>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>; Code Snippets;>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>. CodeSzbuffer db DUP (0);>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>MYINTFUNC procPush edxCall EAXIretdMyintfunc ENDP ;====================================================================addmyint proc uses EDILocal @IDT sidt szbuffer mov EDI, (Idt_reg ptr [szbuffer]). Base

What do you call it? This time I want to use this technology to change the function of an API. I'm not sure if we can call it API redirection again. In this example, I redirect the CALC.EXE shellabout () dialog box to my "Hello world!" Message box (in Pemaker7.zip). You will see how easily you can implement it with the aforementioned code and make very few changes. ...//================================================================Push EDIPush ESIPush EBXMOV ebx,[ebp-10h]Push EBXPush EBXCall

: 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