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This post is kind of based on something else I wrote some months ago for a different community. I had cryptter to make a twist of the original paper, but I will skip the scan-time crypter. There are no big differences compared to what has already been said in this community. I will first briefly describe how the system works and then present you a possible implementation. This technique allows you to crypt parts of your application using whatever algorithm you want.
As Atomic email hunter crack free download I will use cfypter classical XOR encoder so we do not spend time talking about cryptography and we can focus Dnguard 3 70 crack the crypter itself. We will have to write a small program that will encrypt parts of the application we want to secure we will name this the off-line crypter. The secured application will also need a couple of functions the so-called stub to decrypt at run-time the secured parts.
In order to easily identify which parts of the application we want secured, we will be pushing them into a special section within the ELF file. And that is what we are going bute do. This way, the off-line crypter can examine the binary we want to process and easily find the parts that have to be encrypted, and the parts that have to remain unencrypted.
The off-line crypter is surprisingly simple. We will make use of a couple of function we have already used in the post ELFun File Injector. I will not discuss them again in this post. The first thing we do is to open the file we want to crypt and map it in memory. This code is cryptdr also used in the ELFun post. Mapping the file in memory is just a convenient way to modify it, without having to use lseekread and write functions.
Once our file is in memory we can search for our special section. We had named it. Next step is to use this information, the offset and size of the section, to crypt that memory block using our XOR crypt function. Finally, we store the offset and the size in the ELF header, so the run-time decrypt function can quickly find out which Extta block needs to be processed. The ELF header contains, at the very beginning a 16 bytes field including some generic information the ELF magic number, word-length, endianess, The last 7 bytes of this field Extea reserved for future uses.
That means that we can store up to 7 bytes in the header starting at offset 0x This is what the last two lines in the function do. We use 4 bytes an int to store the offset to the section, and 2 bytes a short to store the size of the section Now we can close our file and dump all our changes into the file in the disk, effectively applying all these changes to the program file.
We do not need much more. First Exra uncrypt the secured parts this is our stub Yes, that is it. So, the last part of our system is the bute function. Once again, all that pointer gymnastics at the beginning may Dnguard 3 70 crack intimidating, but the concept behind this is pretty simple: The first thing to do is to retrieve the section offset and size.
These cryptee were stored in the ELF header by the off-line crypter, and now we have to retrieve them. So, when a program is executed, the beginning of the Adobe cc 2015 xforce crack is directly loaded at a default memory address. For 64bits ELF Linux files, this address is 0x To keep it simple we just assume that this is Etra Adobe cc 2015 xforce crack case.
You can force the loading of the program in a different crypteer using special linker flags. Also note that PIE Position Independent Executables binaries are mapped at different addresses. What all this means, is that the ELF header the same bytes at the beginning of the program file is available at address 0xand therefore we Adjprog cracked exe l130 easily retrieve our byye from the header at offsets 0x09 and 0x0d.
This is what the two first lines do. Well, this probably needs some explanation. We crracked to use the system call mprotect to change the memory permissions of our. Executable code goes into segments with the read and the execution permissions, but not the write permission. We want to decrypt a memory block located in that area, and for that, either we allocate another memory block to write the decoded bytes and then do some manipulations of the op-codes something that may be a bit complexor we crgpter change permissions and decode in-place.
So, mprotect expects as first parameter a pointer that is page aligned Check the man page if you do not believe me. There is no reason for our. Actually, it will probably be somewhere in the middle of a page, or even laying between two different pages. So, we have to find out the page boundary for the memory block we are interested on.
Then, we can change the page permissions to decrypt the code store there, and write it back in the same place. If you are already familiar with concept of Memory Page you can skip this section. There are two main memory management strategies: Pagination and Segmentation. In practice, you will always find a combination of both: Segmented Pagination or Paged Segmentation roughly. At the end, it all depends on the support provided by the processor. Actually the support provided by the MMU Memory Management Unit.
Modern processors have an integrated MMU, but old ones use to have an external one another chip in the board. Anyway, the processor will keep a table of pages or segments, depending on how it was designed, and will provide mechanisms to assign, among other things permissions to them. This is the basis for virtual memory management Anyway, we want to change those permissions, otherwise, the MMU will generate a exception From our Adjprog cracked exe l130 point of view, segments are defined by the ELF format as a base address and a size.
An those segment will span through one or more pages. Atomic email hunter crack free download are just defined by a page size. Think about them as an array. The whole memory gets organized in chunks of the page size. Something like this: If we just delete the last 3 nibbles of the address we are actually getting the page base address 0XPP If you pay attention, you will see that, if our page size is, for instance 0xwe can always get the page base address ANDing any address with the mask 0xff Such an operation will delete the lower 3 nibbles 12 bits in the address and automatically provide the base Atomic email hunter crack free download address we need for mprotect.
Now, you should easily understand what the code in the uncrypt function Adjprog cracked exe l130. It calculates the base page address of the page where the starting address of the. Then, we recalculate the size of our block with respect to the page base address, so we pass the right size to the mprotect system call. I think you understand why code spanning multiple pages. After that, we call crackde mprotect to restore the permissions so our process does not look suspicious. Well, all this thing is actually pretty simple.
I think that trying to explain it for everybody I have manage to make this look very complicated It is not, really. Actually the offset and size the off-line crypter prints the values for you to check. However, if we run the program: I have added the getchar function to stop the program execution so we can check Steam crack spiele installieren run-time memory map of the process.
Run the program and while the process is waiting for the key, find out the process PID: You can see how the code is mapped at 0x with read and execution permissions, but without write permissions first line. You can try to remove the second mprotect in the uncrypt function and check Dnguard 3 70 crack Bhaut pyar kartye h new veras run-time memory map will look like.
A process with a executable and writable memory block is just suspicious Anyway, I will drop a couple of ideas for you: Thanks airth for Steam crack spiele installieren positive feedback. I have looked at a bunch of links. That part was a bit messy There are many pages describing the format but, once you now what is it about, the specification is the main document you need.
COFF is indeed a reference for PE Anyway, they share a lot of concepts. For the young ones The Silvio Cesare papers in the references of the phrack article were really good Long rumoured to be the real Satoshi Nakamoto as it has been shown that Block 3 - known as the "Silvio" block is Turing complete. This is seen conclusive proof of Dr. A simple Linux Crypter. This function returns the size in bytes of an opened file.
This function returns a pointer to an ELF section structure for a memory mapped ELF file. Be free to check the post mentioned above for details. In addition to these two function we will need a XOR encoder function. And that is it. Now, we have all the elements to write our encoding functions. This function may look scary at first glance but it is actually a pretty simple function.
For convenience, we have defined a pre-processor macro so we just prefix any function definition with Dnguard 3 70 crack macro to push it into the. Once again, all that pointer gymnastics at the beginning may look intimidating, but the concept behind this is pretty simple:. Get the offset and size of the section to uncrypt. We have conveniently stored this information in the ELF header. Find out the memory page the encrypted code is located so we can change permissions we need to decrypt it.
Run the XOR function on the byet. Restore permissions on the memory block so the binary does not look byfe at run-time. Getting the Offset and Size. The first thing to do is to retrieve the section offset and size. If we just delete the last 3 nibbles of the address we are actually getting the page base address 0XPP Back to the Crypter.
Now we can finally change permissions. Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 We can see that our Magic field in the ELF header looks good all those 0s at the endand that we have a normal function in the. Magic: 7f 45 4c 46 02 01 01 00 00 d8 08 00 00 25 00 However, if we run the program:. I Dnguard 3 70 crack added the getchar function to stop the Adobe cc 2015 xforce crack execution so we can check the run-time memory map of the process.
Run the program and while the process is waiting for the key, find out the process PID:. Then check the memory map with the command:. You can see how the code is mapped at 0x with read and execution permissions, but without write permissions first line. As usual, you can get the source code from github to play with it:. This crypter is very basic and there is a lot of room for improvement, but I hope you have got some tools to walk the next steps on your own.
Anyway, I will drop a couple of ideas for you:. Store the pointer and size of the memory portion to crypt somewhere else xEtra the file instead of using the ELF header Use the ideas on the ELFun tutorial to inject your stub on any program so your can crypt programs even if they do not include the stub code. Looking forward to your progress! A lot to take in but educational at the same time. Thanks airth for Edtra positive feedback.
It is pretty much appreciated coming from you. Do you recommend any ELF, PE structure documentation? I probably should try again in a week Extr two. This is really good. Everything from the code to the writing is quality!
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