Code(dll) injection
Prerequisites::
win32 programming
c++
Typical viruses sometimes inject their processes in another running process by using windows api functions.They then become harder to detect for the antivirus.In this article we will see how we can inject our code in the remote process thereby causing a remote dll to get loaded in the remote process' address space
The steps for injecting a dll in other process are::
1.)Create (or open handle to) the process we want the dll to be injected in.
2.)Allocate some memory for the name of the dll in the desired process (in which we want to inject our dll) using VirtualAllocEx and WriteProcessMemory function.
3.)Obtain the address of LoadLibrary(to load the dll in remote process) in our process using functions GetModuleHandle and GetProcAddress.Here, we assume here that kernel32.dll (which contains the LoadLibrary ) will be loaded at the same address in the remote process .So that the address of LoadLibrary will not differ.
4.)After that we need to use the CreateRemoteThread function
(syntax::
HANDLE WINAPI CreateRemoteThread(hProcess,lpThreadAttributes,dwStackSize
,lpStartAddress,lpParameter,dwCreationFlags,
lpThreadId)
);) to spawn a new thread in the remote process and execute the function LoadLibrary(whose address is specified by the 4th parameter ie.lpStartAddress which we obtained in the above step 3).
4.)LoadLibrary will thus be the default function to be executed in the remote process' thread once it (ie. the thread) starts since it's address has been passed to the CreateRemoteThread function.
5.)This will execute our LoadLibrary function with the parameter lpParameter(ie. the pointer to the name of the dll which we allocated in the remote address space using VirtualAllocEx and WriteProcessMemory in step 2)
6.)Once our dll is loaded the code inside it will be executed.
Thus we see that by using dll inject we can cause the remote application to behave arbitrarily in our own way.Other method to inject are by changing the value of the eip register(Later :))
For more reference and for the api documentation refer to msdn and codeproject..
Working app::http://www.mediafire.com/?858h6tcstxcujo5
Let me know if there are any bugs with the implementation.
~~crank
win32 programming
c++
Typical viruses sometimes inject their processes in another running process by using windows api functions.They then become harder to detect for the antivirus.In this article we will see how we can inject our code in the remote process thereby causing a remote dll to get loaded in the remote process' address space
The steps for injecting a dll in other process are::
1.)Create (or open handle to) the process we want the dll to be injected in.
2.)Allocate some memory for the name of the dll in the desired process (in which we want to inject our dll) using VirtualAllocEx and WriteProcessMemory function.
3.)Obtain the address of LoadLibrary(to load the dll in remote process) in our process using functions GetModuleHandle and GetProcAddress.Here, we assume here that kernel32.dll (which contains the LoadLibrary ) will be loaded at the same address in the remote process .So that the address of LoadLibrary will not differ.
4.)After that we need to use the CreateRemoteThread function
(syntax::
HANDLE WINAPI CreateRemoteThread(hProcess,lpThreadAttributes,dwStackSize
,lpStartAddress,lpParameter,dwCreationFlags,
lpThreadId)
);) to spawn a new thread in the remote process and execute the function LoadLibrary(whose address is specified by the 4th parameter ie.lpStartAddress which we obtained in the above step 3).
4.)LoadLibrary will thus be the default function to be executed in the remote process' thread once it (ie. the thread) starts since it's address has been passed to the CreateRemoteThread function.
5.)This will execute our LoadLibrary function with the parameter lpParameter(ie. the pointer to the name of the dll which we allocated in the remote address space using VirtualAllocEx and WriteProcessMemory in step 2)
6.)Once our dll is loaded the code inside it will be executed.
Thus we see that by using dll inject we can cause the remote application to behave arbitrarily in our own way.Other method to inject are by changing the value of the eip register(Later :))
For more reference and for the api documentation refer to msdn and codeproject..
Working app::http://www.mediafire.com/?858h6tcstxcujo5
Let me know if there are any bugs with the implementation.
~~crank
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4 comments:
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