By | 07.08.2019

You are more exposed than you think: How to crack passwords

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Comments 3 Share A few months ago I attended a local user group meeting that focussed on software security. The presentation rekindled the fire I had for a little research project that I had attempted several months earlier on reverse engineering. Net applications but that at the time I had lost interest in after an hour of unsuccessful googling.
how to crack an application

Reverse Engineering 101 – With Crack-mes

Comments 3 Share A few months ago I attended a local user group meeting that focussed on software security. The presentation rekindled the fire I had for a little research project that I had attempted several months earlier on reverse engineering. Net applications but that at the time I had lost interest in after an hour of unsuccessful googling.

This time with a little more effort I found the right threads and was soon on my way to reverse engineering a product I had written and released to the internet. The scary part was that with little over an hours experience I had in effect bypassed all security that I had implemented in software up to that day… one word describes it best — I was a noob.

In a future post I will demonstrate obfuscation, and why this adds another layer of protection to ones code as well as other techniques that once can try. That being said.. Reflexil – Reflexil is an assembly editor that runs as a plug-in for Redgate’s Reflector , it is able to manipulate IL code and save the modified assemblies to disk. Getting Started — Installing Reflexil into Reflector First, download the above tools from their links.

I am going to assume that you have a knowledge of Reflector. Browse to the Reflexil director and select Reflexil. If the process is done correctly, then the add in will appear in the add-ins available list.

Simply add the assembly that you want to edit to reflector. The assembly can be either an exe, dll or mcl Macro Command Language. Once you have added the assembly to reflector, it will be shown in the tree as a node and you can browse its sub components. In the example below I added BasicApplication.

As I double clicked on the main function, the translated IL code is shown on the left pane of the window. In this instance I have set it to translate to c code. Lets say I now found a section of code I wanted to edit — reflector by default does not allow me to edit code, simply view it — so this is where Reflexil comes into play. Depending on how familiar you are with assembly code, the instruction pane of the Reflexil window will look very much like assembly language of old.

In this instance though we will use a sample simple enough that you should be able to get a basic idea of what is going on just by slowly browsing the instruction list and making educated guesses. Once you have done all the changes you need to, highlight the root of the assembly on the left hand pane and the Reflexil window on the right hand side will change to show the following… Click the Save As button on the right hand pane and enter the new name of your patched application.

Bypassing Basic Security While I am no expert when it comes to security, I have picked up a few things in the last couple of days. In my mind, placing security for licensing in an application is a game of cat and mouse — the person implementing the security wants to hide the checks they put in so that the person trying to bypass the security does not know where it is. Ultimately it is also a game of time — with enough time, someone with enough skill will be able to identify and bypass any security measures.

So the real objective for someone implementing security is really that you want to implement security so that it takes so much time for someone to bypass that it is cheaper for them to actually buy the product. That saying — you are only as strong as your weakest link is so true with security. WriteLine “Enter secret password: Looking at the application compiled through reflector and reflexil we would get something that looked like the following….

At the point where the arrow is, we have the weakest link. All we need to do is change the check from a true to a false and in effect what we have done is told the system that if the inputted password does not equal the secret word then continue, else give no access… We do this by right clicking on line 15 in Reflexil and going Edit and then changing the brtrue.

As demonstrated above, the very most basic of protection is able to be bypassed in a matter of seconds. The approach I demonstrated is the most simple of scenarios and for more complete examples of similar techniques and a bit more info on how IL Code works I advise you read the following blogs….

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You are more exposed than you think: Or, just use the Chrome extension. This is a very easy trick, but the real value is when you combine it with other methods. It is significantly harder to retrieve the password stored in an application — you would need a disassembler or debugger for that, and good assembly or bytecode experience. Therefore, if there is a web version of the same app, it is much more lucrative target. You could just hand them the password in plain text.

VIDEO: Use Any Trial Software Forever! No Crack Needed | Learn By Research

Crack Seal. Application Checklist. This checklist is one of a series created to guide State and local highway maintenance and inspection staff in the use. It is significantly harder to retrieve the password stored in an application — you would need a disassembler or debugger for that, and good. A crack-me is a small program designed to test a programmer’s reverse engineering skills. They are programmed by other reversers as a legal.

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