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Instantly share code, notes, and snippets. Code Revisions 1 Stars 19 Forks 7. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. I also fix bugs as they are discovered. To facillitate this I print the link date in the main Window Title so I instantly have an idea about how old the version is that I am looking at. This date is calculated at run time.
I did a test on a DLL, and got 3 Image section headers with the following names so it seems to be working:. Generic ; using System. InteropServices ; using System. This is valid only for object files. This is valid for object files only.
For more information, see section 5. Valid only for object files. Number of sections is in the file header. OpenSystem. Seek dosHeader. GetAssembly typeof PeHeaderReader. ReadBytes Marshal.
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PtrToStructure handle. AddrOfPinnedObjecttypeof T ; handle. AddSeconds fileHeader. I seek to that position, and read in the NT File Header. From that header I can get the linker time stamp. As this is a general purpose library I also check whether the header is 32 or 64 bit, and read in either the Optional 32 bit Header, or the Optional 64 bit Header, which can then be used however you like.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment.If you perform penetration testing as your daily job, it is often useful to inject backdoor into legit application. There are lots of tools out there that can perform those kind of tasks, but do you know how they really work? In this post, I will show you a simple method to inject a backdoor into an executable.
PE Format Manipulation with PEFile
Here we will use Python as it is a really versatile language and also one of the most used in offensive computing. I strongly suggest you read one of my previous article about the Portable Executable format to fully understand this post. Here is the global idea of how we will modify the application to inject our backdoor:. Here, we will use the first method as it is more easy and reliable, but if you want to try the second one you can check the following link.
Note: Be careful, if you run an antivirus on your machine, modifying the structure of an executable could be interpreted as a viral attack and the AV will block or remove your executable. Now you know. Before adding a new section, we need to know the structure details to not break our executable. In a PE executable, the section is composed of 2 parts:.
Each field help Windows to load the sections properly into the memory. Here, we are only interested by the following fields, the others will be initialized at zero.
A relative virtual address is the virtual address of an object from the file once it is loaded into memory, minus the base address often equal to 0x of the file image. Finally, we have to take care of the alignment. Not clear enough? Here is how to find the right values for you:. In the follwing sections, I will describe the different steps I used to inject a backdoor into an executable. The full code will be available at the end of the tutorial.
Now, we can start. We already can set 4 values in our header. I assume that our shellcode will be smaller than bytes. If one of the pointer point to an existing header, we would corrupt the executable. To avoid this issue, we will set our pointers to go after the last section of the executable. Now, the new section will be located right after the last section on the disk and in memory. To comply with the alignment, we will modify the code to dynamically compute the right values for the section size.
Note: For the tests I used putty.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Most of the information contained in the PE file headers is accessible, as well as all the sections' details and data. The structures defined in the Windows header files will be accessible as attributes in the PE instance. Only shortcuts added for convenience will depart from that convention.
Please, refer to Usage Examples for some code snippets that demonstrate how to use pefile. Here are a few examples of what a dump produced with pefile looks like for different types of files:. To work with authenticated binaries, including Authenticode signaturesplease check the project verify-sigs.
That being said, small glitches are found now and then. If you bump into a PE that does not appear to be processed correctly, do report it, please!
It will help make pefile a tiny bit more powerful. The module has no dependencies; it is endianness independent; and it works on OS X, Windows, and Linux. Prompted by the move to GitHub, the need to support Python 3 in addition to resolving a slew of pending issues some having to do with the old versioning schemepefile has changed its version number scheme and from now on it will be using the release date as its version.
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Python Branch: master. Find file. Sign in Sign up. Go back.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.
If nothing happens, download the GitHub extension for Visual Studio and try again. Most of the information contained in the PE headers is accessible as well as all sections' details and their data. The structures defined in the Windows header files will be accessible as attributes in the PE instance.
Only shortcuts added for convenience will depart from that convention. Armed with it it's possible to explore nearly every single feature of the file format.Télécharger optical fiber communications by gerd keiser
Please, refer to Usage Examples for some code snippets showing how to use pefile. A few examples of what a dump produced with pefile look like can be found here for a packed filehere for one of kernel In order to work with authenticated binaries, including Authenticode signaturesplease check the project verify-sigs. That being said small glitches are found every now and then. If you bump into a PE that does not appear to be processed correctly, do report it please! Prompted by the move to GitHub, the need to support Python 3 in addition to resolving a slew of pending issues some having to do with the old versioning schemepefile has changed its version number scheme and from now on it will be using the release date as its version.
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Python Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit ec72fda Feb 7, Features Some of the tasks that pefile makes possible are: Inspecting headers Analysis of sections' data Retrieving embedded data Reading strings from the resources Warnings for suspicious and malformed values Support to write to some of the fields and to other parts of the PE, so it's possible to do some basic butchering of PEs.
The functionality won't rearrange structures to make room for new ones, so use it with care. Overwriting fields should mostly be safe.
In order to work with authenticated binaries, including Authenticode signaturesplease check the project verify-sigs pefile runs in several pipelines scanning hundreds of thousands of new PE files every day and, while not perfect, it has grown to be pretty robust over time.
Dependencies pefile is self-contained. Recent changes Prompted by the move to GitHub, the need to support Python 3 in addition to resolving a slew of pending issues some having to do with the old versioning schemepefile has changed its version number scheme and from now on it will be using the release date as its version. Projects and products using pefile Didier Stevens' pechecka tool for displaying PE file info, handles PEiD files better then pefile does MAEC is a standardized language for encoding and communicating high-fidelity information about malware based upon attributes such as behaviors, artifacts, and attack patterns.
A File Walkthrough Shows a walkthrough over the raw view of an executable file with the PE format fields laid out over the corresponding areas The following links provide detailed information about the PE format and its structures. You signed in with another tab or window. Reload to refresh your session.
You signed out in another tab or window.It is completely written in C and compiles to a cross-platform conform. Net Standard library. Besides access to all typical PE structures native and.
Net headersome utility function like the Import Hash used in malware-analysis are provided. This paragraph gives a short introduction on how to use PeNet with a few examples. For a full API documentation, see the link in the header.
For more example check the Article link in the header. You can install PeNet into your project directly from Nuget. The parsed PE header is split into multiple modules and sub-modules. To see how the parser structures the PE header and which information can be found where see the API documentation page link in header.
Here are a few examples on how to access different parts of the PE header. For more examples, check the Article link in the header. Quick Start This paragraph gives a short introduction on how to use PeNet with a few examples. Install the library You can install PeNet into your project directly from Nuget. Improve this Doc.A long time ago, I wrote an article about how to use the pefile module to analyze the Portable Executable file format, but this post does not exist anymore. As I use this module quite often, I decided to rewrite it.
This module now supports Python 3 and some bugs have been fixed. This module is multi-platform and is able to parse and edit Portable Executable files. To fully appreciate this post it is required to have some basic understanding of the layout of a PE file. Also, the project repository includes some usage examples if you want more details.Ck2 tactics simulator
This procedure has been tested on the last version of Microsoft Windows 10, but it should work on previous version. First, be sure to prepare your environment :. Note: For the tests I used putty. Getting started with pefile is fairly simple.
First you need to import the module in your code and then the PE class using the executable path as a parameter. You can also pass other parameters, including:.
Only the basic headers information will be available in the attributes:. Once the executable is successfully parsed, the data is readily available as attributes of the PE instance. Its main objective is to indicate the offset of the main headers containing the actual information about the PE file, the NT headers.
You can also diplay the full content of a structure by using the dump method. It will returns a string representation of the structure. In this output, the first filed is the offset related to the executable and the second field is the offset related to the structure.
As the DOS header is the first structure of the executable, those values are equal. Now, we will list the Data Directories. Note The Optional header member describes elements of the file such as the import and export directories that make possible to locate and link DLL libraries.
Other entries provide structural information about the layout of the file, such as the alignment of its sections. Then, we can list each imported function in a specific DLL, for example, kernel Similarly, the exported symbols. As putty.Trovoada 2020 mp3
Sections are added to a list accesible as the attribute sections in the PE instance. The common structure members of the section header are reachable as attributes.
One of the most interesting functionality of pefile is editing executables. All values support assignment, so we can easily alter an executable. Here we will inject a shellcode at the entry point. It will corrupt the executable as we will overwrite the orginal code to execute the shellcode.
It overwrite the bytes at the given file offset with the given string, it takes 2 arguments:. By executing the new executable, you should see a message box indicating that the injection was successful. Note: To generate the shellcode I used Metasploit. There are many other features you should try like matching PEiD signaturesbut you should play be able to play with it on your own now.
A large amount of resources is available on the official repository if you want to go further with pefile. Security Researcher. Bytes Addict.When we open native or. First we must obtain some. We can create.
NET executable using Mono Project :.Win32 API-Custom Portable Executable File Parser (code on github)
Native executable can be created using MinGW cross-compiler:. Now when we have a. NET and a bit. This is quite unexpected because we used two completely different compilers to create them. These letters are often called a Magical Number or a file signature.
Then we may compare them:. After DOSBox starts we must mount our directory with. We may use CLS command to clear the screen and attempt to run our. For those that never used MS-DOS, this system supports only short files names eight letters for file name plus three letters for extension, so called 8. That is why our HelloWorld. Everything works as expected. But that is not all of it.
Instead of our.Pacific ocean weather forecast 15 day
To confirm that assumption we must look under the cover. To extract these values I wrote a small Java program. Source code is available as a GitHub Gist here. This means that a four byte integer e. Of course this applies only to multi-byte types supported by CPU shortintlongdouble and float. Also because characters in ASCII strings are represented by single bytes they are not affected by endianness. The most important thing that I learn by looking at the header was its size: 64 bytes. Since the message starts at offset 0x0E we may assume that int 0x21 is the last instruction of the program.What does additional account action pending
Now we should try to analyze this assembly code, fortunately for me I have found this beautifully commend piece of code here :. First we must create a valid assembly program:.
WriteLine "Hello, world! Programs refer to a specific address in memory using segment:offset pair.
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