esp 3250

Operating System: WIN2KTools: OLLYDBG1.1, ImportREC, LordPE: Http://www.ultraprotect.com/acpr_pro.exeTarget Program: ACProtect 1.21 professional moderator program. Shelling Process:1. Find the Stolen code deformation and its pseudo OEP.After loading with OLLYDBG1.1, stay at the entry of the program:006D4000 pushad006D4001 dec ecx006D4002 sbb esi, B59B7C21006D4008 clc006D4009 mov ecx, ebx006D400B dec ecxUse the IsDebug 1.4 plug-in to remove the Ollydbg debugger flag. Ignore all other exception op

runtimemiddot;mainmiddot;f (SB), rodata,$4 Disassembly verification Just compile a Go program and verify with W32asm. 200419560 Sub ESP, 0000000C : 00419563 mov eax, DWORD pt: [ESP+0C] : o0419$67 Lea ebx, DWORD ptr [ESP+10] : 00419$6B mov DWORD pct [ESP+04], eax : 0041956F MNV DWORD pt: [

shown in 1. Of course, an error will be returned. Following the error prompt, we can easily locate the following code.Figure 1 0041D2E8. 68 98A64300 PUSH # export video.0043a698; Sorry0041D2ED. 68 6CA64300 PUSH # export video.0043a66c; Invalid username or registration code sorry Place a breakpoint at any position above, re-debug, and the software is broken in the following places. 0041D291. E8 FABA0000 CALL 0041D296. 6A 01 PUSH 10041D298. 8BCE mov ecx, ESI0041D29A. C74424 20 000> mov dword ptr

class name in Rtti in VCFrom the chart above, the contents of the RTTI are empty. So the implementation of VC and the model in the book is inconsistent? Isn't rtti on the top of a virtual table? The following validation is followed:2. Put the virtual table above the address of Rtti info, set to 0, then typeid can work? Can dynamic_cast still work? If you can also work, the data that this address points to is irrelevant.If the Rtti pointer on the virtual table is empty, dynamic_cast cannot run,

Several basic assembly instructions in detail common registers Register Device 16 Guests 32 Guests 64 Guests Cumulative register Ax EAX RAX Base Address Register Bx EBX RBX Count Register CX Ecx RCX Data registers Dx EDX Rdx Stack base pointer Bp Ebp RBP Variable address register SI Es

pushed into a total of two dual characters, that is, 8 bytes of data. Then execute the call command. The Call Command pushes the 32-bit address of the return address (mov dword ptr...) into the next command, and then jumps to XXXXXXXX to execute the command. At the entrance of the comb subroutine (XXXXXXXX), the stack status is as follows: 03000000 (recall the small endian format)02000000Yyyyyyyy As mentioned above, the standard starting code of a subroutine is as follows: Push EBP; Save the o

1> in Linux, if the executable files depend on other shared libraries, the system allocates the files from 0x40000000 to the corresponding space and loads the shared libraries into the corresponding space. 2> In i386, esp always points to the top of the stack, while EBP points to a fixed position in the function activity record. EBP points to the value of EBP before calling the function, this ensures secure responses. EBP is also called a frame poin

Method 1 MoV eax, 0MoV EBX, 0MoV ECx, 0MoV edX, 0 Method 2 XOR eax, eaxXOR edX, EDXXOR ECx, ECxXOR edX, ECx Method 3 Hmm... yep, here the stall is partially balanced by the non-change of the source argument (a work/branch avoided by the CPU), so in this specific case, the difference is minimized. XOR eax, eaxXOR ECx, ECxMoV EBX, eaxMoV edX, ECx Technically the "result" stall is slower (but never enough to put a useless instruction! Even a Nop !), There is also possible stall with the sourc

I have been wondering whether C can return a struct over the past few days. I have seen a post on the Internet and I think it is good. I would like to share it with you: To check the alignment of the structure set by Vc by default, the special definition structure is as follows:1: typedef struct _ ctest2 :{3: Char acharacter;4: int inumber1;5: Char bcharacter;6: Char ccharacter;7: int inumber2;8:} ctest, * pctest;9:The getdata () function returns the structure defined above, so that you can obs

0x80483ec 0x80483ee 0x80483f0 0x80483f1 ....End of worker er dump.(GDB) disass hiDump of worker er code for function hi:0x80483d0 0x80483d1 0x80483d3 0x80483d8 0x80483dd 0x80483e0 0x80483e1 0x80483e2 End of worker er dump. Let's take a look at some memory images.(Memory high address)+ -------- +| Bffffbc4 | Address of argv (that is, address of argv [0)0xbffffb84 + -------- +| 00000001 | argc Value0xbffffb80 + -------- +| 400309cb | return address of main0xbffffb7c + -------- + | Bffffb98 | EBP

C program assembly operation mode analysis, assembly Mode Analysis SJTUBEAR Original Works reprinted please indicate the source/"Linux Kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000 1. Assembly In the initial phase of the Linux kernel course, the first thing you need to know is how to operate stacks by assembler and assembler. Next we will analyze how the next simple C program is expressed by the assembler program!2. Get the assembly code. First, we write a simple

; Mp_bit = 30; mp_nail = 32-mp_bit; mp_mask = 3 fffffffh; base 30bit 28 ~ 30; mp_limb_t; mpn_rshift (mp_ptr RP, mp_srcptr up, mp_size_t N, unsigned int CNT); Assert (n> = 1); Assert (CNT> = 1 );; assert (CNT ; ---------------------------; ==|====... ======|=====; Hsb lsb; ----------------------------- align 16mpn_lshift: Label. cp dword at ESP + 4 label. ap dword at ESP + 8 label. n dword at

The parameters of the clang compiled function are stored in the register (saved in a certain rule) and then pressed into the stack in the function.For later use. For example, in the previous example, the Red section: Copy Code code as follows: . Global _dectobin _dectobin: Pushq%RBP Movq%RSP,%RBP Movq%rdi,-8 (%RBP) #第一个参数, stored in RDI Movq%rsi,-16 (%RBP) #第二个参数, kept in RSI Movq-8 (%RBP),%rax Movq-16 (%RBP),%RBX Movq $63,%RCX ...... POPQ