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Solution to two ANTI-W32dasm programs

7615 jbe 004614C8: 004614B3 80FB3A cmp bl, 3A: 004614B6 7310 jnb 004614C8.: 004614B8 889D0CF6FFFF mov byte ptr [ebp + FFFFF60C], bl: 004614BE C6850DF6FFFF00 mov byte ptr [ebp + FFFFF60D], 00: 004614C5 83C602 add esi, 00000002 * Referenced by a (U) nconditional or (C) onditional Jump at Addresses:|: 004614B1 (C),: 004614B6 (C)|: 004614C8 8D850CF6FFFF lea eax, dword ptr [ebp + FFFFF60C]: 004614CE 50 push eax: 004614CF E8EC9D0400 call 004AB2C0: 004614D4 59 pop ecx: 004614D5 8945F4 mov dword ptr [e

PowerShadow Master V2.6 Registration Algorithm Analysis

test ax, AX0000004b JE shadowse.00000010800426051 mov ecx, dword ptr ss: [ESP + C]00426055 PUSH EDI00426056/cmp ax, 30; number?0000005a | jb short shadowse.0000006c; 003665c | cmp ax, 3900426060 | ja short shadowse.0020.6c;> "9" indicates the hop.00426062 | and eax, 0 FFFF00426067 | sub eax, 30;-0x300000006a | jmp short shadowse.00000096003666c | cmp ax, 41; uppercase letters?00426070 | jb short shadowse.00000082; 00426072 | cmp ax, 5A00426076 | ja short shadowse.00000082;> "Z" indicates the ho

Make up for the regret of CCDebuger

[1-4]004011F6 |. 8B1D 64214000 mov ebx, dword ptr ds: [402164]; Take the username 5th to 8th characters004011FC |. 3305 71214000 xor eax, dword ptr ds: [402171]; User [1-4] xor sn [1-4] = k100401202 |. 331D 75214000 xor ebx, dword ptr ds: [402175]; User [5-8] xor sn [5-8] = k200401208 |. 25 0F1F3F7F and eax, 7F3F1F0F; K1 and 7f3f1f0f = p10040120D |. 81E3 00010307 and ebx, 7030100; K2 and 7030100 = p200401213 |. 33C9 xor ecx, ECX; Use ECX for Loop00401215 |> 8BF0/mov esi, EAX00401217 |. 8BFB | m

Exim string_vforat () Overflow Vulnerability Analysis

and long string "looooooooooooong buffer. First, p and last are set: -P points to the buffer at the 0x08CCC965 address-Last point to 0x08CCC965 + 3-1 = 0x08CCC967 Then, start processing "% c", p points to the address plus the size of a char and a space: P = 0x08CCC965 + 2 = 0x08CCC967 Then, the width and precision are set to-1. Then process "% s ": -Set slen to 21 (using strlen ()).-If width and precision are false, set them to 21. Last minus the new width value and less than p: 0x08CCC967-21 =

Platform cannot apply Stanford theme

Here is the steps to enable a custom theme using the manual method described here:Https://github.com/edx/edx-platform/wiki/Stanford-ThemingFirst create the base VM:mkdir fullstackcd fullstackcurl -L https://raw.githubusercontent.com/edx/configuration/master/vagrant/release/fullstack/Vagrantfile > Vagrantfilevagrant plugin install vagrant-hostsupdaterexport OPENED

Ollydbg entry series (III)-function reference

ran to system airspace. The code shown in the ollydbg Disassembly window is as follows: 77d3213c 6a 0C push 0c77d3213e 68 a021d377 push user32.77d321a077d32143 E8 7864 feff call user32.77d185c0 What should I do? Don't worry. Let's press Alt + F9: 00401328 |. E8 a5000000 call crackhea.004013d2; key: Press F7.0040132d |. 3bc6 CMP eax, ESI; Comparison0040132f |. 75 42 jnz short crackhea.00401373; wait until it is finished The cursor stops at the command at the 00401328 address. Now we press F7

Optimization of memcpy by VC

From: http://blog.codingnow.com/2005/10/vc_memcpy.html In many compilers, memcpy is an intrinsic function, that is, this function is implemented by the compiler. It is easier to be optimized during compilation than the inline function. The compiler can make multiple versions based on whether the memcpy parameter is a constant or a variable to achieve optimal performance. This cannot be done using inline or template. Let's take a look at the optimization of memcpy by VC. (Vc6) Void Fo

Function parameter transfer mechanism (zz) in C/C ++)

unit opened by SWAp in the stack as the form parameter X and Y. This can be seen from the following Assembly Code (the author adds the annotation ):22: void main ()23 :{............13: int A = 1, B = 2;00401088 mov dword ptr [ebp-4], 100401_f mov dword ptr [ebp-8], 214: int * P1 = ;00401096 Lea eax, [ebp-4]00401099 mov dword ptr [ebp-0Ch], eax15: int * P2 = B;00401_c Lea ECx, [ebp-8]0040366f mov dword ptr [ebp-10h], ECx16: swap (P1, P2 );004010a2 mov edX

[Assembly Learning] For beginners in assembly-function call stack Change Analysis (from hacker situation)

(const char *,);9. This function is not called to clear the stack because it does not know how many parameters there are.10; instead, the caller is responsible for clearing the stack.11. Data12 sztextfmt byte '% d', 0; this is used for type conversion. It is the same as that of C, and the character is of the byte type.13a DWORD 1000; hypothesis14B DWORD 2000; the processed values are all double-character, no difference between int and long.1516; /**///////////////////////////////////// ////////

Fast fastposchar algorithm (improved version) by codegame

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->SSE optimization algorithm: Function cgposcharsse (subchar: Char; srcstring: pchar; Len: integer; Order: Boolean = true): integer; // Subchar-> Al; srcstring-> edX; Len-> ECx order-> [EBP + 8] ASM Push ESI Push EBX Test ECx, ECx JZ @ notfound Test edX, EDX JZ @ notfo

[Add to favorites] Use seh for reverse tracking

Use seh for reverse trackingI don't want to perform literacy for seh hereWhen a program is debugged and encounters INT 3, the debugger will be interrupted.When a program runs normally and encounters INT 3, an exception occurs. The system reports an error. If seh is setFor the moment, no error is reported, and the processing permission is handed over to Seh. We can make some effort in it to determine whether the software has been tracked. The following is a routine I wrote: . 386. Model flat, std

The current compiler is really Nb.

After reviewing the compilation principles, yundun issued a question like this:SourceProgram: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 Void F ( Int A, Int B, Int C, Int D, Int X, Int Y, Int Z) 2 { 3 While ( B) 4 { 5 If (C D) 6 X = X + Z; 7 Else 8 X = Y - Z; 9 } 10 } The maximum optimization compiled with GCC 3.3.5 is: Code highlighting produced by Actipro CodeHighl

Disassembly Analysis of auto-increment operations

mov dword ptr [I], eax; assign 1 to I00411a65 mov ECx, dword ptr [I]; load I into ECx. In this case, ECx = 100411a68 add ECx, 1; ECx = ECx + 1, ECx = 200411a6b mov dword ptr [I], ECx; assign ECx to I, at this time I = 200411a6e mov edX, dword ptr [I]; load I to edX, (EDX) = 200411a71 add edX, 1;

Create a Windows Virtual Machine Under xen

corresponding bit to 1# '0' -> force to 0# 'x' -> Get a safe value (pass through and mask with the default policy)# 'k' -> pass through the host bit value# 's' -> as 'k' but preserve across save/restore and migration# # Expose to the guest multi-core cpu instead of multiple processors# Example for intel, expose a 8-core processor :#cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,# ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx',# '4,0:eax=001

Csapp 3e:bomb Lab (Secret_phase)

This is a secret level that needs to be triggered by actively invoking the Secret_phase function and can be invoked via call secret or jump *0x address.Paste out function: (fun7 function part without comments, and then continued on the handwritten figure to parse the function)0000000000401204401204: - theEc , Sub$0X8,%RSP401208: - -FfTest%rdi,%rdi 40120b: About2bJE 401238;if%rdi==0,ret. 40120d: 8b - mov(%rdi),%edx

In-depth understanding of computer systems (3.8)------array allocation and access

array starts at 0, when I equals 0 o'clock, the address we access is XAFor example, the following array declaration: Char a[12]; Char *b[8]; Double c[6]; Double *d[5];We can get the following information: note Because both B and D are declared arrays, in IA32, pointer variables occupy 4 bytes of memory space.   such as the following code:#include Printing results are:  From the above we can also see that the starting address is 6356736, that is, the address of a[0], the back of the acce

Linux-0.11 Kernel Memory Management get_free_page () function analysis

/**author:davidlin*date:2014-11-11pm*email: [email protected] or [email protected]*world:the City of SZ, in China*ver:000.000.001*history:editor time do1) Linpeng 2014-11-11 created this file!2)*/Linux-0.11 Memory Management module is more difficult to understand in the source code part, now the author's personal understanding publishedFirst hair Linux-0.11 kernel memory management get_free_page () function analysisHave time to write other functions or files:)/** Get Physical Address of first (a

Linux-0.11 Kernel Memory Management get_free_page () function analysis

/**author:davidlin*date:2014-11-11pm*email: [email protected] or [email protected]*world:the City of SZ, in China*ver:000.000.001*history:editor time do1) Linpeng 2014-11-11 created this file!2)*/Linux-0.11 Memory Management module is more difficult to understand in the source code part, now the author's personal understanding publishedFirst hair Linux-0.11 kernel memory management get_free_page () function analysisHave time to write other functions or files:)/** Get Physical Address of first (a

C Language inline Assembler API memory search engine Instance _c language

, pprocnameaddress, pprocindexaddress; _asm { Push EBX Push ESI mov eax, hmodule MOV EDX,DWEXPORTCRC//edx= function name CRC32 mov ebx, eax//ebx= base mov eax, [ebx+0x3c]//eax= file header offset mov esi, [ebx+eax+0x78]//esi= output table offset, file header + Optional header length =$78 Lea ESI, [ebx+esi+0x18]//esi= function Name quantity = function Quantity [ebx+esi+$14] LODs DWORD ptr Ds:[es

21 Ultra-practical cool "data visualization tools"

. Leaflet is designed as an easy-to-use, performance-friendly tool. Thanks to HTML5 and CSS3, it supports all major computer and mobile platforms. If you also want to expand the app, there are a number of plugins available to install.   Tableau Public It's an easy-to-operate app that can help you create a visually stunning piece of work. Just open the data and explore it with Tableau's desktop version. Then, store the visualizations in your 1GB

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