If the version is new and there is no script, given your level of expertise right now, this will be a very, very long and arduous task. Themida is so complicated to unpack that most people write scripts and so you can search for a script for the given version you are trying to unpack and attempt to use that. Themida also severely obstructs the import address table, splits up the entire program and only loads one portion at a time (this prevents you from "dumping" the entire program like you did with UPX) and then unloads it on a per-routine basis, and implements a bunch of anti-analysis tricks, many of which are listed on their website.Īdditionally, you will need to know the exact version of Themida you are dealing with. The best method to unpack a VM-protected packer like Themida is to devirtualize it, which involves figuring out the entire instruction set that the packer uses and writing a script to interpret that language.
Payday 2 unpacking code#
In a Themida binary, different parts of the code are run in virtual machines and it obscures the behavior of the target program. For example, in a UPX packed binary, you just need to find OEP and dump it down before finally rebuilding the IAT. Themida uses an extremely complex virtual machine environment combined with every anti-debug and anti-analysis trick in the books, combined with many different obfuscation methods. Choose your favourite character, pick an outfit for them, pick a mask and customise its appearance, and add your chosen weapon and armor skins - and there’s your unique heister There’s a large variety of cosmetic items in the game, and they’re unlocked progressively through. It is literally worlds different from unpacking UPX and if you are new to unpacking, you have absolutely no business trying to unpack Themida. In PAYDAY 2 you’re able to truly make your character your own. Unpacking Themida, especially the newer versions, is not a small task by any means. I've unpacked files packed with UPX, Themida is stumping me.
), but due to it missing a ton of libs (DirectX, OpenGL.
Payday 2 unpacking windows#
I've gotten a few addresses where it finds the API's, but it doesnt load all of them! (from what I have seen)įor example, this one address I had loaded only Windows libs (kernel32.dll, KernelBase.dll. I've tried breakpointing at LoadLibraryA. Recently I've been trying to unpack an executable (圆4 architecture), aka find the OEP and restore the IAT, that is packed with Themida 圆4: Before we continue I'd like you to keep in mind I'm relatively new to unpacking executables.
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