Posted on: May 15, 2020 Posted by: admin Comments: 0


Naz Naz 21 1 1 bronze badge. The above problem can be solved by multiple methods but to demonstrate it in a very simple way I will use the following steps,. Most of the time people use ollyscripting for unpacking malwares. I decided to start learning Reverse Engineering and picked Ollydbg to start my path. Pydbg is my favourite debugger, I use it in various automation tasks and it is extremely flexible and powerful. The data is saved in a log file. Stack Overflow works best with JavaScript enabled.


Uploader: Dull
Date Added: 25 October 2012
File Size: 47.34 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 62424
Price: Free* [*Free Regsitration Required]

Please note that the script is just to demonstrate the concept, it may fail when call used after decision instructions.

Division of XenArmor Pvt Ltd. Windbg [ Reference 3 ] is the official Microsoft debugger. You can download Ollyscript from here [ Reference 4 ]. Copy the files to the OllyDbg 1.


It is developed by Immunity Inc. NirIzr 9, 1 1 gold badge 24 24 silver badges 73 73 bronze badges.


In my case, I downloaded ODbgScript. The actual function I need in the end to complete my task is as following.


We want to track malloc, whenever malloc is called, our olyscript should display requested size for allocation and ollyscgipt pointer. Honeywell Honeywell 11 1 1 silver badge 2 2 bronze badges. These are known as conditional breakpoints and in conditional breakpoints we want to perform something when breakpoint hit.


So people written scripting plugins for ollydbg, the one that i will use in this article is Ollyscript by ShaG. Reverse Engineering Stack Exchange is a question and answer site for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation. It is the most powerful debugger available for reversing on windows platform mainly Kernel side of it and it also supports symbols.

x’s Blog: Ollyscript Tutorial – Unpack UPX

Put breakpoint on VirtualAlloc Extract parameters from stack Ollhscript return address from stack and put breakpoint on that Get the value from EAX register. I am also ignoring 1st argument to VirtualAlloc ollyscriipt. Please refer to the Ollyscript help file [ Reference 4 ] for more details.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Our Enterprise Company www. Post as a guest Name.

Ollydbg [ Reference 3 ] is one of the best ring 3 user-land ollyscrlpt. Notice that in this script first i am setting breakpoint on entry point and then on VirtualAlloc not directly to VirtualAlloc because pydbg does not support deferred breakpoints.

So I dump the data from address starting at 03F48D78 – 2nd argument where 03F48D78 is the address to start the dump from. Now I want to loop this function and automate it.


It supports almost all functionalities like dumping memory, decision making etc. Stack Overflow works best with JavaScript enabled. Breakpoint on malloc Extract parameter from stack Extract return address from stack and put breakpoint on it Get value from EAX register.

The best answers are voted up and rise to the top. Unicorn Meta Zoo 9: This article teaches you how to become smart reverser by automating your reverse engineering tasks through Scripting. Pydbg ollysdript my favourite debugger, I use it in various automation tasks and it is extremely flexible and powerful. In our case we want extract the size of allocation from stack. Maybe you should try this or a previous version. You can try github.


Tracking memory allocation Tracking specific API calls Unpacking a family of malwares Intelligent decision making based on some specific events. In this article, I will show you how to automate some of these common tasks through Scripting for main reversing debuggers i.


Leave a Comment