jmp for dummies

Reprinted: Q version hacker overflow tutorial I am writing this article, hoping to give some help to cainiao who want to learn about Buffer Overflow just like me, because no such articles have been found yet. First, we will introduce two methods of using Stack Overflow-jmp esp and jmp ebx. Next, we will explain the simple method of conversion. Finally, we will give two practical examples, write isno. printe

//////////////////////////////////////// /////////////// Get jmp esp/jmp ebx/call EBX address in a process// By isno// It must be compiled in debug mode in VC.//////////////////////////////////////// /////////////# Include # Include # Include # Define fnendlong 0x08# Define nopcode 0x90# Define noplong 0x0# Define buffsize 0x20000 # Define shellbuffsize 0x800# Define shellfnnums 9 // Number of API function

Yi Wei public platform interface dummies tutorial, Yi Wei micro dummies. Yi Wei public platform interface dummies tutorial, Yi Wei micro dummies Yi Wei public platform interface dummies tutorial part of content: Interface 9 hyperlink. rmvb interface 8 music information. rmvb

// Hookapi. CPP: defines the entry point for the console application. //// conclusion: add an assembly 0xe9 unconditional jump value to the front of the original API function pointer, and jump the API function called by the system to the custom function to execute # include "stdafx. H "# include //////////////////////////////////////// //////////////////////////////////////// ////////////// JMP command Explanation: N

a testing tool is introduced that is not supported by people. People should see the need to improve a specific process, and be aware that the introduction of a specific test tool may ultimately help to accomplish their work more efficiently. If an organization does not sort these three points in order, the sentence "with the test tool, dummies are still dummies" will come true. Or in other words, an organi

introduced that is not supported by people. People should see the need to improve a specific process, and be aware that the introduction of a specific test tool may ultimately help to accomplish their work more efficiently. If an organization does not sort these three points in order, the sentence "with the test tool, dummies are still dummies" will come true. Or in other words, an organization that only i

C-language dummies (1): nested loops-program structure, dummies Loop statement nesting a loop structure can contain another loop, called loop nesting, or multiple loops. The nested loop is a double loop. The outer loop is called an external loop, and the inner loop is called an internal loop. --------- I don't know where the basic concepts come from 　　 　　This is the first blog of the baby. I will not ask fo

For JMP commands: (1) JMP short labelEquivalent to (IP) = (IP) + 8-bit displacement jump range is [-128,127](2) JMP near PTR labelsEquivalent to (IP) = (IP) + 16-bit displacement jump range is [-32768,32767](3) JMP far PTR labelsEquivalent to (CS) = the segment address of the label, (IP) = the offset address of the la

Source: bkbll@cnhonker.net evil baboons 1. preface.In Buffer overflow in Linux, there are many shellcodes used to jump to the stack. in windows, there are many jumps using jmp esp. There is no new technology in this article, but it is just a whim, just change my methods.2. comparison.The frequently used shellcode method to jump to the stack has a good side. For example, you can put shellcode in ENV to avoid the length limit. the disadvantage is that

The above question is: Why does JMP 12345678 of the same assembly command correspond to different machine codes? First, the machine code E9 indicates that this is a near jump (near JMP). Here we need to add the relevant knowledge: JMP is divided into three types: ① short jump (short JMP, only jump to the range of 256 b

, wparam, lparam) // empty Hook Function{ Return (callnexthookex (g_hhook, ncode, wparam, lparam ));}Hookapi2_api bool installhook () // outputs the function of installing an empty hook{G_hinstdll = loadlibrary ("hookapi2.dll ");G_hhook = setwindowshookex (wh_getmessage, (hookproc) Hook, g_hinstdll, 0 );If (! G_hhook){Messageboxa (null, "set error", "error", mb_ OK );Return (false );} Return (true );}Hookapi2_api bool uninstallhook () // output the Yu in the hook function{ Return (unhookwindowsh

Calculation of jmp distance of E9: distance = destination address-(current address + 5) (plus 5 is because the JMP command occupies a total of 5 words, actually the destination address minus the end address of the JMP command, that is, the current address + 5If the target address is f1e0b63eThe current address is 8093c6d8.Distance = f1e0b63e-8093c6d8-5 = 714cef61

This is the main hand to understand the writing shellcode is not easy. Really not easy, look at the author's code, all feel that they have nowhere to start. The need for the underlying principle of knowledge is also very much need to add up.Intend to gradually add later. At this stage, jmp ESP is understood. The subsequent dynamic fetch API was faulted on the host. The problem is similar to searching for the JMP