Jump to content

vulnserver - Can't find JMP ESP in ntdll.dll


Recommended Posts

This tutorial shows how to find a JMP ESP in nttdll.dll


  1. Find address for EIP

In this step we have to check the registers and the stack. We have to find a way to jump to our buffer to execute our code. ESP points to the beginning of the C part of our buffer. We have to find a JMP ESP or CALL ESP instruction. Do not forget, that the address must not contain bad characters!

Open the executable modules list in OllyDbg (press the E letter on the toolbar). Select a module, for example the ntdll.dll. (Vulnserv would not be a good choice as its address contains zero!)

Press right click on the code and select Search for/All commands. Enter JMP ESP. A couple of possible address is displayed. Select one.

I've followed the steps but still couldn't find JMP ESP instruction in nttdll.dll.

enter image description here

enter image description here

enter image description here

enter image description here

JMP ESP is not there


Link to comment
Share on other sites

At this point you've gone beyond what I can help with, I work at the web app layer, not all the way down here.


Are you working in Windows 7? Try searching some of the other modules and try searching for something that you know exists like the XOR EAX,EAX in your last screenshot to see if you can find that. If you can't, then something is wrong with the search.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...