Updated on 2020-09-07

File

proxy.c

#include <windows.h>

BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
  switch (reason) {
  case DLL_PROCESS_ATTACH:
    WinExec("calc.exe", SW_HIDE);
    break;
  case DLL_THREAD_ATTACH:
  case DLL_THREAD_DETACH:
  case DLL_PROCESS_DETACH:
    break;
  }
  return TRUE;
}

proxy.def

EXPORTS
NSLICENSE_DateToMagicCode = nslicense_old.NSLICENSE_DateToMagicCode

Command

i686-w64-mingw32-gcc proxy.c -c -o proxy.o
dlltool proxy.o -e proxy.exp -z proxy.def -l proxy.lib --export-all-symbols
i686-w64-mingw32-gcc proxy.o proxy.def -shared -o proxy.dll

i686-w64-mingw32-gcc proxy.c -c -o proxy.o
gnatdll proxy.o -e proxy.def -d proxy.dll

i686-w64-mingw32-gcc proxy.c proxy.def -o proxy.dll -shared -s

gendef - nslicense.dll > 123.txt

awk 'NR==1 {print "EXPORTS" > "proxy.def"} {print $1 " = nslicense_old." $1 > "proxy.def"}' 123.txt

strip -sv proxy.dll

busybox mv -f nslicense.dll nslicense_old.dll
busybox mv -f proxy.dll nslicense.dll

Reference