Trashdbg - TrashDBG the world's worse debugger

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Debugging Tools trashdbg
Overview

trashdbg2

The world's worse debugger

Over the course of multiple OALABS Twitch streams we will build the world's worst debugger! The purpose of the streams is to learn more about the inner workings of debugging under Windows and gain a better general understanding of what our tools are doing when we are debugging malware.

References

Much of the code in this project is heavily copy-pasted from multiple sources on the Internet. We will try to maintain a list of original sources here, but we may occasionally miss sources while on stream. If we missed something let us know so we can add it!

No PRs

Because this project is meant to be a community effort on stream we won’t be accepting PRs. Aside from some maintenance/cleanup all coding will be done on-stream. If you have feature requests or suggestions leave your feedback as an Issue or come chat with us on Discord.

Join Us!

💖 Check out our schedule we stream Thursdays and Sundays at 1300 EST

Chat Support

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Comments
  • Cannot get access to DLL info when handling LOAD_DLL_DEBUG_EVENT event

    Cannot get access to DLL info when handling LOAD_DLL_DEBUG_EVENT event

    When we attempt to handle a LOAD_DLL_DEBUG_EVENT event we find we don't have access to information about the DLL that was just loaded.

    https://github.com/OALabs/trashdbg/blob/90a2adc8872fd437141c7cb44b169ec69ba16041/trashdbg/trashdbg.py#L23

    We tried querying information about the DLL via GetModuleFileNameExW using pEvent.u.LoadDll.lpBaseOfDll but we were getting an invalid handle issue for the module handle.

    We also tried using EnumProcessModulesEx and CreateToolhelp32Snapshot to enumerate the modules and find the newly loaded module but it seems when the LOAD_DLL_DEBUG_EVENT event is raised the full information about the DLL has not been populated yet so both these methods cannot access the new DLL.

    opened by herrcore 3
  • why doesn't WriteProcessMemory change the memory permissions for us

    why doesn't WriteProcessMemory change the memory permissions for us

    https://github.com/OALabs/trashdbg/blob/438e07543f5490d1a0c26dfa74060c42d5ddb5d8/trashdbg/win32memory.py#L107

    According to the oldnewthing blog WriteProcessMemory should automatically change the memory permissions so we can write to it without us having to manually change them.

    This fails when we test it so we have to wrap write memory ourselves ... why??

    opened by herrcore 1
  • We clobber multiple exports from the same dll that share an address

    We clobber multiple exports from the same dll that share an address

    Some dll exports have the same address so we can't index them by address: https://github.com/OALabs/trashdbg/blob/438e07543f5490d1a0c26dfa74060c42d5ddb5d8/trashdbg/trashdbg.py#L109

    We need to index by name or something else that is unique!

    opened by herrcore 0
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