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ECx, dword ptr [dwmovenum]SHR eax, ClRETMovebitr endp; //////////////////////////////////////// ///////////////////////////Bin2dec proc pbin: DWORD ; Argument checkMoV eax, dword ptr [pbin]Test eax, eaxJZ @ exitPush ESIMoV ESI, eaxXOR eax, eaxXOR edX, EDXClD@@:LodsbTest Al, AlJZ finalflag; FinalCMP Al, 30 h; 0JZ isbinCMP Al, 31 H; 1JZ isbinJnz @ B Isbin:Add edX, EDXLea
key ReadFile is found, after reading the HID device data, what should I do? According to common sense, it is time to analyze and verify it. Indeed, my analysis is correct. Here is the key assembly code obtained at that time, because this article was written in a few months later, therefore, some content can only be recalled. After reading the code, you can fully understand the protocol. 004417B2. 8B0D D8CD9500 mov ecx, dword ptr ds: [95CDD8] // retrieves the high byte of the CH1-CH4004417B8. A3
Network security experts use practice to tell you How situation awareness should be implemented and how network security situation should be handled. In a large-scale network environment, cybersecurity Situation Awareness obtains, understands, displays, and predicts the future development trend of all security elements that can cause changes in the network situation, does not stick to a single security element. The situation awareness system consists
virtual function, the main function reserves 8byte of space on the stack for object x to hold the vptr pointer and member variable i. The following is an assembly code for the constructor of x: ?? 0x@ @QAE @h@z PROC ; X::x, comdat _this$ = ecx ; 5 : X (int ii) { push ebp mov EBP, esp push ECX The purpose of the pressure stack ecx is to reserve 4byte of space mov DWORD PTR _THIS$[EBP] for this pointer (the first address of X object) , ecx; Store the this pointer
the software is the subscription related CD of the Computer newspaper in 2001. The protection at the time of 7.0 is very good. The latest version should be much better now...Okay, let's get started. The first step is to install it (attracting the nheader of the Wolf), and then enter a string for registration. An error dialog box is displayed, the error message "the registration code is incorrect and cannot be registered" is displayed ". Then let's use Fi to see what shell it uses. ASPack 2.001,
ptr [ebx] movl (% ebx), % eaxIn the ATT assembly instruction, the operand extension instruction has two suffixes: One specifying the length of the source operand and the other specifying the length of the target operand. ATT's symbolic extension command is "movs", and the zero extension command is "movz""(Intel commands are" movsx "and" movzx "). Therefore, "movsbl % al, % edx" indicates the register alThe byte data is extended from byte to long, and
compiler will automatically expand a simple function like STD: reverse () in inline mode, the generated Optimization assembly code is as fast as version 1. // Version 3: Use STD: reverse to reverse a range, with high-quality code Void reverse_by_std (char * STR, int N) { STD: reverse (STR, STR + n ); } ======== What code will the compiler generate? Note: Viewing the compiled code generated by the compiler is certainly an important means of understanding program behavior, but never think tha
Virus program source code instance analysis-example code of CIH virus [2] can be referred to push eax; block table size Push edx; edx is the offset of the virus code block table Push esi; buffer address The total size of the merged virus code block and virus code block tables must be smaller than or equal to the unused space size. Inc ecx Push ecx; Save NumberOfSections + 1 Shl ecx, 03 h; multiply by
push EAX; block table size push edx; edx is the offset of the Virus code block table push esi; buffer address Combined virus code block and Virus code block table must be less than or equal to the amount of space not used Inc ECX push ecx; Save numberofsections+1 SHL ecx, 03h; multiply 8 push ecx; reserved virus block table space Add ecx, eax add ecx, edx
cccccccch004011b6 rep STOs dword ptr [EDI]41: A Ca (1 );004011b8 Push 1004011ba Lea ECx, [ebp-8]004011bd call @ ILT + 95 (A: a) (00401064)42: B CB (2 );004011c2 push 2004011c4 Lea ECx, [ebp-10h]004011c7 call @ ILT + 10 (B: B) (0040100f)43: c cc (3 );004011cc Push 3004011ce Lea ECx, [ebp-18h]004011d1 call @ ILT + 105 (C: C) (0040366e)44:45: A * P [3] ={ ca, CB, CC };004011d6 Lea eax, [ebp-8]004011d9 mov dword ptr [ebp-24h], eax004011dc Lea ECx, [ebp-10h]004011df mov dword ptr [ebp-20h], ECx004
:16:error:bad instruction ' PUSHL%edi ' X86cpuid-elf.s:18:error:bad instruction ' Xorl%edx,%edx ' X86cpuid-elf.s:19:error:bad instruction ' PUSHFL ' X86cpuid-elf.s:20:error:bad instruction ' popl%eax ' X86cpuid-elf.s:21:error:bad instruction ' Movl%eax,%ecx ' X86cpuid-elf.s:22:error:bad instruction ' Xorl $2097152,%eax ' X86cpuid-elf.s:23:error:bad instruction ' PUSHL%eax ' X86cpuid-elf.s:24:error:bad instr
installation 00C0E001> 60 pushad 00C0E002 E8 03000000 call UltraISO.00C0E00A 00C0E007-E9 EB045D45 jmp 461DE4F7 00C0E00C 55 push ebp 00C0E00D C3 retn 00C0E00E E8 01000000 call UltraISO.00C0E014 00C0E013 EB 5D jmp short UltraISO.00C0E072 After shelling 00401620> $/EB 10 jmp short dumped.00401632 00401622. | 66: 623A bound di, dword ptr ds: [edx] 00401625. | 43 inc ebx 00401626. | 2B2B sub ebp, dword ptr ds: [ebx] 00401628. | 48 dec eax 00401629. | 4
address for all 6F statements ). This CALL is called not only when the money and wood population changes, but even when the Organization is created or destroyed. All we need here is to HOOK the call to the change of money and wood. After all, other abnormal functions have already been written by our predecessors and there is no need to repeat the wheel. (If you are interested, you can analyze it yourself) You only need to determine the value of edx
the contents of RAM inside pull. You can go to "see the snow" to learn a simple assembler command. 004f3b9c/$ PUSH EBX 004f3b9d |. 83C4 F8 ADD esp,-8 004f3ba0 |. 8BDA MOV Ebx,edx; Data Destination address after decryption 004f3ba2 |. 8bd4 MOV Edx,esp; Data Delivery Destination Address 004f3ba4 |. B9 04000000 MOV ecx,4; The number of passes is 4 004f3ba9 |. E8 12eef8ff call client.004829c0; Pass the 4 valu
The annual "big project" for reinstallation of the system has been under construction. Sort out the tools and materials of last year. Today, we start to give our customers a bit of gameplay assistance. (The customer will not mind if it has been more than a year) Today is the first article. Analysis notes of long Xiang mi Chuan Blame Breakthrough: Ce searches for the change value and does not stop selecting the blame. Locate the following:Code: 00413b5e-89 be B0 00 00-mov [ESI +
ecx0040039f-pop eax00400460:00400460 E 8 f5ffffff Call 0040045A 00400465 0000 add byte ptr [eax], al0040045a:0040045a eax 0040045B 870424 xchg dword ptr [ESP], eax 00400 45E push eax 0040045F C3 retn input function when stack layout $ ==> > 00400465 __CALL_RET_EIP- > Eax$+4 > 0040039E _call_ret_eip-$+8 > 7c800000 kernel32_imagebase out function when stack layout $ ==> > 004 0039E _call_ret_eip$+4 > 00400465 __call_ret_eip$+8 > 7c800000 kernel32.7c800000 came to the conclusion that MOV ecx,00400
follows:Figure 1 shell check for pandatvIt can be seen that this program is not shelled, so it does not involve shelling, and it is written by Borland Delphi 6.0-7.0. The Code Compiled by Delphi is different from the code written by VC ++. The two most obvious differences are as follows:1. When a function is called, parameters are not transferred completely using stacks, but mainly using registers. That is, the Delphi compiler transfers function parameters using register by default. This is tot
, the MOV instruction has a data format and two operands, so the general form is [Movx s D]. where x is the data format, S is the source operand and D is the purpose operand.Here's a simple example, such as we have an instruction for MOVL%edx%eax. The execution process is as shown.As you can see, the contents of the%edx register are copied to the%EAX register after the instruction is executed. It is necessa
that some characters have been entered in the "Serial Number" column. Leave it empty, enter 123456789 in the "Registration Code" column, and then press the "register" button.ProgramInterrupt at 0x004f0b60, trace and find that the input length is required, re-enter 1234567890 abcdef in the "Registration Code" column, and then press the "register" button. After the interruption, the following code will be tracked: Code: 004f0bbb mov eax, [EBP + var_10]; [eax] = "1234567890 abcdef"Code: 004f0bbe
critical module Base address mov esi, DWORD ptr fs: [0x30]; mov esi, [esi + 0x0c]; mov esi, [esi + 0x1c]; mov esi, [esi]; mov edx, [esi + 0x08]; Gets the function address of the GetProcAddress push ebx; Push edx; Call fun_getprocaddress; mov esi, ea
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