February 2012
Intermediate to advanced
800 pages
23h 55m
English
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Packed DLLs
There are additional complications associated with packing DLLs, so this capability is not supported by all packers. Handling the exports of the DLL is one complication. The export table in the DLL points to the address of the exported functions, and if the DLL is packed, then the exported functions are also packed. The packer must account for this to ensure that the DLL operates properly.
Unpacking a DLL is not much different from unpacking an EXE. The key thing to remember is that
DLLs have an OEP, just like executables. All DLLs have a function called DllMain, which is called when the DLL is loaded. The OEP in a DLL is the original start
of DllMain. The start address listed in the packed DLL is the address of the unpacking stub, ...
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